样式: 排序: IF: - GO 导出 标记为已读
-
Local intracellular stiffening of ascidian embryo in cleavage developmental stage observed by atomic force microscopy Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-17 Takahiro Kotani, Yuki Miyata, Yosuke Tsuboyama, Yuki Fujii, Takaharu Okajima
During the cleavage stage in ascidian embryos, cells undergo repeated and regular cell division in the animal hemisphere. We investigated how the intracellular stiffness, that is, the apparent Young’s modulus of cells in the animal hemisphere changes in the cleavage stages from the 16-cell to 76-cell stages using atomic force microscopy (AFM). The AFM force mapping experiments showed that a pair of
-
Hydrogen-included plasma-assisted reactive sputtering for conductivity control of ultra-wide bandgap amorphous gallium oxide Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-17 Kosuke Takenaka, Hibiki Komatsu, Taichi Sagano, Keisuke Ide, Susumu Toko, Takayoshi Katase, Toshio Kamiya, Yuichi Setsuhara
Conductivity control of a-Ga2Ox films by cation/anion off-stoichiometry such as oxygen vacancy formation and hydrogen doping have been achieved by hydrogen-included plasma-assisted reactive sputter deposition system and physical and electrical properties of a-Ga2Ox films formed by this system have been investigated. The change in resistivity of a-Ga2Ox thin films deposited by the hydrogen-included
-
Testbed mimicking intracellular environment for optical-resolution photoacoustic microscopy Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-17 Daisuke Nishimae, Takuro Ishii, Kouetsu Ogasawara, Yoshifumi Saijo
Photoacoustic imaging (PAI) represents an innovative method that utilizes optics for transmission and acoustic for sensing. Within the realm of PAI modalities, optical-resolution photoacoustic microscopy (OR-PAM) stands out for its ability to achieve high-resolution cellular and intracellular imaging. However, an optical testbed setup emulating the intracellular environment and accelerating the development
-
A sparse adaptive decision feedback equalization approach for the high data rate vertical underwater acoustic communication in deep sea Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-17 Yukihiro Kida, Mitsuyasu Deguchi, Takuya Shimura
In underwater acoustic communication (UWAC) environments, multichannel decision feedback equalizer (MDFE) techniques combined with single carrier modulation schemes are widely employed to suppress multipath interference while adapting to time-varying channel response. While MDFE is a powerful technique, the estimation of the numerous filter taps is generally complex problem, and the numerically complexities
-
Robust adversarial learning model to segment non-speckle regions in blood flow echo Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-17 Yuga Mori, Masaaki Omura, Shota Suzuki, Ryo Nagaoka, Shangce Gao, Kunimasa Yagi, Hideyuki Hasegawa
In our previous study, we analyzed the contrast of blood flow echo, and non-speckle regions were more frequently detected in the porcine blood with the high flow velocity. However, this contrast method is dependent on the degree of smoothing and threshold for outliers. This study developed a new U-Net model incorporating domain adaptation with both in silico and experimental data. This model segments
-
Verification of effect of interference between multiple scatterers on the evaluation of backscattering coefficient Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-17 Hayato Kutsuzawa, Shinnosuke Hirata, Kenji Yoshida, Emilie Franceschini, Tadashi Yamaguchi
Backscatter coefficient analysis methods for biological tissues have been clinically applied but assume a homogeneous scattering medium. In addition, there are few examples of actual measurement studies in the HF band, and the consistency with theory has not been sufficiently confirmed. In this paper, the effect of correlations among scatterer positions on backscattering was investigated by performing
-
Design strategy and working principle of GaN vertical trench gate MOSFETs with p-type shielding rings Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-17 Hongjie Shao, Yongchen Ji, Xuyang Liu, Heng Wang, Chao Liu
Shielding ring (SR) structures are widely employed beneath the gate trench of vertical trench gate MOSFETs for the purpose of enhancing the gate oxide reliability and avoiding premature breakdown. To facilitate an in-depth understanding of the vertical power MOSFETs with p-type SRs (SR-MOSFETs), we numerically investigated the influence of the key parameters on the static characteristics of GaN-based
-
Formation of one-dimensionally self-aligned Si-QDs and their local electron discharging properties Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-17 Yuki Imai, Katsunori Makihara, Yuji Yamamoto, Wei-Chen Wen, Markus Andreas Schubert, Jongeun Baek, Ryoya Tsuji, Noriyuki Taoka, Akio Ohta, Seiichi Miyazaki
Self-aligned Si-quantum-dots (Si-QDs) with an areal density as high as ∼1011 cm−2 have been fabricated on ultrathin SiO2 by using a ∼4.5 nm thick poly-Si on insulator (SOI) substrate, and controlling low-pressure CVD using monosilane (SiH4), and followed by thermal oxidation. By controlling the thermal oxidation processes of Si-QDs and the poly-Si layer, we have successfully demonstrated the vertical
-
Visualization of oxygen vacancies at CeO x /Y-HZO interface by spectrum imaging method and multivariate analysis Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Koichi Higashimine, Mizuki Saito, 0000-0003-1702-9427Mohit2, Eisuke Tokumitsu
Electron energy loss spectroscopy—spectrum imaging measurements using a scanning transmission electron microscope are carried out to clarify the details of microstructure at the interface of the CeO x -capped Y-HZO film prepared by the chemical solution deposition (CSD) method. We confirmed that by the present CSD the independent capped layer of CeOx successively deposited on Y-HZO. The crystal structure
-
Effects of diameter of optical absorber visualized by an annular array AR-PAM system on spectrum characteristics of photoacoustic signals Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Riku Suzuki, I. Gede Eka Sulistyawan, Takuro Ishii, Yoshifumi Saijo
Spectrum characteristics of photoacoustic signals are potential indicators to assess the structural information of optical absorbers. This study investigated whether a spectrum analysis approach can evaluate microvascular diameters obtained by an annular array AR-PAM system. First, 2D numerical simulations were performed to estimate spectral changes in five absorbers with different diameters from 30
-
In-situ synthesis of CdS and Ag2S quantum dots in poly(diallyldimethylammonium chloride) gels Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Shuto Taniguchi, Satoshi Tsukuda
In this study, we proposed a hybridization method for polymer and quantum dots (QDs) by directly forming QDs in polymer gel; this method was completely different from conventional methods such as mixing and encapsulation. QDs were fabricated by reacting metal ions in solution with sulfide ions adsorbed in a gel made from poly(diallyldimethylammonium chloride) (PDADMAC), a cationic polymer. CdS and
-
Spring constant of an AFM cantilever with a thin-film plasmonic waveguide formed at its end Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Masanao Ito, Lang Lang, Kaifeng Zhang, Kei Kobayashi
Atomic-force-microscope (AFM)-based tip-enhanced Raman spectroscopy (TERS) is a promising analytical technique that can identify the physical and chemical properties of a sample’s surface. In the conventional TERS setup, the tip is directly irradiated by an incident light, which causes degradation of the contrast of the TERS signal due to the Raman scattered light from the surface area around the tip
-
Investigation of vacancy-type defects in diamond-like carbon films using slow positron beam Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Kazuhiro Kanda, Tomohiro Mishima, Hiroki Akasaka, Fuminobu Hori, Atsushi Yabuuchi, Atsushi Kinomura
Positron annihilation spectroscopy was used to investigate vacancy-type defects in diamond-like carbon (DLC) films. From Doppler broadening measurements of the γ-rays produced by annihilation and positron annihilation lifetime (PAL) using a slow positron beam on DLC films deposited by various deposition methods and conditions, it was found that there is a good correlation between the S parameter obtained
-
Cryogenic solid deuterium target formation to realize highly pure deuteron acceleration by high-intensity laser Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Tianyun Wei, Akifumi Iwamoto, Zechen Lan, Takehito Hayakawa, Yasunobu Arikawa, Daiki Tanabe, Takashi Ishimoto, Takato Mori, Masatoshi Takeshita, Masakatsu Murakami, Yanjun Gu, Alessio Morace, Mitsuo Nakai, Akifumi Yogo
In recent years, laser-driven neutron sources have attracted attention for their applications such as nondestructive analysis and the production of medical radioisotopes. One of the efficient neutron production methods is the use of the 9Be(d, n)10B reaction on a beryllium target with deuterons accelerated by laser–plasma interactions, since this is an exothermic reaction. For efficient deuteron acceleration
-
Dynamic characteristics and deep reinforcement learning of proportional-integral-differential controller for quadruped stator-based ultrasonic linear motor Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Yukun Jiang, Fangyi Wang, Tatsuki Sasamura, Abdullah Mustafa, Takeshi Morita
Ultrasonic linear motors have many advantages, such as small size, light weight, and a lack of electromagnetic interference. In our previous study, a quadruped stator-based ultrasonic linear motor that mimics the motion of an inchworm based on longitudinal and bending modes was proposed. However, our previous studies focused on voltage control, overlooking the influence of phase, which made accurate
-
High tolerant design of athermal Si wavelength filter using Mach–Zehnder interferometer Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Takanori Sato, Kengo Maeda, Yusuke Sawada, Takuya Mitarai, Takuo Hiratani, Takuya Okimoto, Tsutomu Ishikawa, Naoki Fujiwara, Hideki Yagi, Kunimasa Saitoh
A design method for the athermal Mach–Zehnder wavelength filter, which is available in the Si-on-insulator platform, is proposed. We can obtain much higher fabrication-tolerant characteristics by introducing a condition, minimizing the dependence of the waveguide width on the athermal condition, to the wavelength filter design. Our design has the arm waveguides divided into four sections, and each
-
Twist angle dependence of graphene-stacked junction characteristics Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Hayate Murakami, Fumiya Fukunaga, Motoki Ohi, Kosuke Kubo, Takeru Nakagawa, Hiroyuki Kageshima, Yasuhide Ohno, Masao Nagase
Vertically stacked graphene diodes are fabricated using epitaxially grown graphene with twist angles ranging from 0° to 30°. Their switching behavior and negative differential conductance are observed at all the measured angles. The junction conductance in the initial state does not indicate clear angle dependence and is almost constant, i.e. 231 μS for all devices. The junction conductance in the
-
Zinc oxide (ZnO) nanowire by hydrothermal synthesis and its application to pH sensing Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Noah Jang, June Soo Kim, Hyunjun Kim, Da Ye Kim, Jiajie Wang, Yujin Nam, Maeum Han, Seong Ho Kong
Recently, the importance of pH sensors in monitoring the pH of marine and water environments is growing. Although such sensors have been developed, existing fabrication methods have the challenge of requiring complex structures. Consequently, oxide-semiconductor pH sensors have been actively researched, with a particular focus on ZnO-based pH sensors that are economically viable and easy to manufacture
-
Self-poling and DC poling of Mn doped Pb(Mg1/3Nb2/3)O3-Pb(ZrTi)O3 single crystals grown by a solid state crystal growth process Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Hiroshi Maiwa, Yushi Yamagata, Yu Xiang, Haiyang Sun, Ho-Yong Lee, Yohachi (John) Yamashita
Acceptor Mn-doped Pb(Mg1/3Nb2/3)O3-Pb(ZrTi)O3 (PMN-PZT) single crystals (SCs) grown by a solid state crystal growth (SSCG) process electrode with Ag at 650 °C showed a high piezoelectric coefficient (d 33) of 520 pC N−1 at 25 °C by self-poling, i.e. without any additional poling process. Upon heating above the Curie temperature (T c), the impedance characteristics’ oscillation peak due to piezoelectricity
-
Optimization of the coupling efficiency under self-injection locking in a narrow linewidth hybrid wavelength tunable laser diode Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Tatsuya Yabuki, Tomohiro Kita
In this study, a fiber Fabry–Perot (FFP) interferometer was connected to a hybrid wavelength-tunable laser diode consisting of a semiconductor optical amplifier chip and Si photonics chip, and spectral linewidth narrowing was achieved using the self-injection locking effect. The hybrid wavelength-tunable laser was equipped with a variable-reflectivity mirror, which allowed the optimization of κ, the
-
Use of periodic 2D pillar array for performance enhancement of AlN-based SMR BAW resonators Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Hua-yong Luo, Ting Wu, Zi-jiang Yang, Chang-yu Ye, Jing-fu Bao, Ken-ya Hashimoto
This paper discusses the applicability of a two-dimensional (2D) periodic pillar array as the first layer of an acoustic mirror for AlN-based solidly mounted resonators of bulk acoustic waves. It is based on the idea that the periodic pillar array behaves like a uniform layer when the period is much smaller than the wavelength and its behavior is given by the ensemble average of pillar materials. The
-
Fabrication of conductive Nb-doped anatase TiO2 thin films by mist chemical vapor deposition using aqueous solutions of water-soluble Ti and Nb compounds Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Rento Naito, Megumi Ariga, Kaede Makiuchi, Ayaka Nakamura, Tomohito Sudare, Ryo Nakayama, Ryota Shimizu, Kentaro Kaneko, Yasushi Sato, Taro Hitosugi, Naoomi Yamada
Electrically conductive Nb-doped anatase TiO2 (Ti1−x Nb x O2: TNO) films can be fabricated through mist CVD using aqueous precursor solutions of water-soluble oxo-peroxo-glycolato titanium complex and ammonium niobium oxalate. Post-deposition annealing in vacuum crystallizes the as-deposited amorphous films into a conductive anatase phase, leading to the fabrication of conductive TNO films. Notably
-
Controlling the structure and composition of SnO2-based thin film with reactive sputtering to improve the sensitivity of semiconductor CO2 sensor Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Takuto Maeda, Mutsumi Sugiyama
The sensitivity of SnO2 thin film-based CO2 gas sensors was enhanced by controlling the surface structure employing reactive sputtering during the deposition process to carefully adjust the oxygen partial pressure to modify the surface structure of the SnO2 films. This process increased the sensitivity, primarily due to larger surface area and improved gas adsorption capabilities. Furthermore, the
-
Polymorphic transformation from metastable β to stable α phase in MnTe flake Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Shunsuke Mori, Yuji Sutou
Manganese telluride (MnTe) is an intriguing polymorphic semiconductor. Among them, the metastable β-MnTe phase, characterized by a wurtzite-type structure, has been successfully fabricated as a sputtered film on substrates. However, bulk or free-standing β-MnTe without substrates has never been realized. In this study, we fabricated a β-MnTe flake using a lift-off process. Notably, the X-ray diffraction
-
Four-terminal polycrystalline-silicon vertical thin-film transistors on glass substrates Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Kosei Suzuki, Kotaro Kusunoki, Yuto Ito, Akito Hara
This study aimed to fabricate n-channel four-terminal (4 T) polycrystalline silicon (poly-Si) vertical thin-film transistors (VTFTs) with submicron gate lengths on a glass substrate. The 4 T VTFTs have a poly-Si active layer crystallized via metal-induced crystallization using nickel (Ni-MIC), a top gate (TG), and a bottom gate (BG). Here, the TG covers all the channel regions, and the BG affects only
-
Comparing mechanism response and thermal conductivity of Ti3C2 and Ti3C2O2 Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-15 Po-Han Tseng, Thi-Xuyen Bui, Tang-Yu Lai, Yu-Sheng Lu, Yu-Hsun Lai, Ming-Hong Lin, Te-Hua Fang
This study uses molecular dynamics to investigate the effect of various temperatures and sample sizes on the mechanical mechanism and thermal conductivity of Ti3C2 and Ti3C2O2 Mxenes. The size of the Mxenes decides the severity of the crack and the von Mises stress clustering. The elastic phase trend of Ti3C2 materials in different sizes follows Hooke’s law, while the complex elastic trend is for the
-
Room temperature atomic layer deposition of zinc titanium oxide using sequential adsorption of dimethyl zinc and tetrakis(dimethylamino)titanium Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-12 Haruto Suzuki, Ryo Miyazawa, Masanori Miura, Bashir Ahmmad, Fumihiko Hirose
Complex oxide films of TiO2 and ZnO are deposited by RT atomic layer deposition (ALD) with a sequential adsorption process. In this ALD, a Zn precursor of dimethyl zinc (DMZ) and a Ti precursor of tetrakis(dimethylamino)titanium (TDMAT) are used. In the sequential adsorption step, the DMZ saturation on the surface is followed by partial adsorption of TDMAT. It is assumed that the TDMAT molecule is
-
Development of ferroelectricity with crystallographic phase transformation in Hf0.5Zr0.5O2 thin films upon initial stimulation of an electric field exceeding the coercive field Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-12 Yukinori Morita, Takashi Onaya, Shutaro Asanuma, Hiroyuki Ota, Shinji Migita
This study demonstrates a drastic transformation of ferroelectricity and crystallographic phase in Hf0.5Zr0.5O2 (HZO) thin films through the first stimulation of an electric field larger than the coercive field in metal-ferroelectric-metal (MFM) capacitors. Initially, capacitance–voltage (C–V) measurements in fresh MFM capacitors with voltage sweep smaller than the coercive field indicated constant
-
A miniature swimmer actuated by a PZT ring ultrasonic underwater propulsion system Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-12 Yuan Qian, Deqing Kong, Daiki Nagasaki, Manabu Aoyagi, Minoru Kuribayashi Kurosawa
This study investigates a scheme utilizing a ring transducer for an acoustic underwater propulsion system. Acoustic underwater propulsion systems are well suited for the inspection and repair of underwater robots due to their small size, high power density, and simple structure. Previous research has focused on self-propelled swimmers utilizing disc transducers. However, the radial vibration component
-
Compressed sensing reconstruction of cell mechanical images obtained from atomic force microscopy Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-11 Yuki Miyata, Feng-Yueh Chan, Takayuki Uchihashi, Takaharu Okajima
Compressed sensing (CS), a technique in signal processing that reconstructs sparse signals from a limited sampling number, has been valuable in topographic images obtained from atomic force microscopy (AFM). However, how CS is effective in reconstructing AFM mechanical images remains unclear. We investigated the reconstruction of topographic and mechanical images of living cells, such as developing
-
Study on movement measurement for internal defects in concrete structures by noncontact acoustic inspection method using correlation processing Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-11 Tsuneyoshi Sugimoto, Yutaka Nakagawa, Kazuko Sugimoto, Itsuki Uechi, Hitoshi Takagi, Noriyuki Utagawa, Yasukazu Nihei
The noncontact acoustic inspection method using acoustic irradiation induced vibration and a scanning laser Doppler vibrometer can detect internal defects in the surface layer of concrete structures, etc, over long distances and without contact. Since this method uses flexural vibration in principle, it can be used as an alternative method to tapping inspection. Therefore, there has been an increase
-
Interpretable structure-property correlation in X-ray diffraction patterns of HfZrO thin films via machine learning Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-11 Lei Feng, Takahiro Nakamura, Zeyuan Ni
The X-ray diffraction (XRD) patterns of materials contain important and rich information in terms of structure, strain state, grain size, etc. The XRD can become a powerful fingerprint for material characterizations when it is combined with machine learning techniques. Attempts utilizing machine-learning-based methods mainly focus on phase identification for mixture compounds. Herein, we applied a
-
Impact of hydrogen plasma treatment on fluorine-contained silicon nitride films Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-11 Takumi Kobayashi, Haruto Omata, Kiyokazu Nakagawa, Yuichiro Mitani
It has been suggested that the trap energy level in silicon nitride (SiN) films becomes shallow due to hydrogen and fluorine incorporation, which causes a charge migration in the MONOS memory cells and deteriorates the data retention characteristics. To solve these issues, we have proposed the hydrogen plasma treatment and demonstrated the reduction of the shallow trap density consequent to the removal
-
Method for measuring time waveforms of minute sinusoidal displacements using continuous waves with a network analyzer Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-11 Yuya Komatsu, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai
This study proposes a method for precise measurement of time waveforms of minute sinusoidal displacements using continuous waves. The technique involves measuring the S-parameter of ultrasonic waves reflected from an object undergoing sinusoidal vibration with a network analyzer. When the sinusoidal displacement is not sufficiently small, second-order side peaks emerge in its inverse Fourier transform
-
Optical analysis of III-nitride micro-light-emitting diodes with different sidewall treatments at low current density operation Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-11 Matthew S. Wong, Stephen Gee, Tanay Tak, Srinivas Gandrothula, Steve Rebollo, NamGoo Cha, James S. Speck, Steven P. DenBaars
In this work, the optical efficiency of III-nitride blue micro-LEDs (μLEDs) ranged from 5 × 5 to 60 × 60 μm2 with different sidewall treatments at low current density range was investigated. The results showed dielectric sidewall passivation using atomic layer deposition (ALD) has superior optical enhancement compared to conventional RF sputtering, where most of the enhancement occurred at low current
-
Development of printed X-ray grating and its application to an imaging system Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-10 Hayato Komatsu, Wataru Yashiro, Xiaoyu Liang, Ayako Yoshida, Yasunori Takeda, Tomohito Sekine, Daisuke Kumaki, Shizuo Tokito
The short wavelength of X-rays makes them attractive for high-resolution imaging systems in fields ranging from medicine to industry. The thin-film grating required for X-ray imaging can be created using printing, which is a cost-effective method for large-area imaging. Since the grating resolution (line/space, or L/S) influences the imaging resolution, it is crucial to enhance the L/S through printing
-
Dissolution dynamics of poly(4-hydroxystyrene) in potassium hydroxide (KOH) and sodium hydroxide (NaOH) aqueous solutions investigated by quartz crystal microbalance (QCM) method Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-09 Yuko Tsutsui Ito, Kyoko Watanabe, Takahiro Kozawa, Kazuo Sakamoto, Makoto Muramatsu
The molecular size of an alkaline cation has been reported to affect the dissolution of resist film in an alkaline aqueous solution. However, the details are still unclear. In this study, the dissolution dynamics of poly(4-hydroxystyrene) (PHS) in potassium hydroxide (KOH) and sodium hydroxide (NaOH) aqueous solutions were investigated to clarify the effects of small alkaline cations on the dissolution
-
DMD maskless lithography optimization based on an improved genetic algorithm Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Shengzhou Huang, Yuanzhuo Tang, Bowen Ren, Dongjie Wu, Jiani Pan, Zhaowei Tian, Chengwei Jiang, Zhi Li, Jinjin Huang
In this paper, we propose an effective method for optimizing mask design using an enhanced genetic algorithm (GA), significantly boosting digital micromirror device (DMD) maskless lithography performance. After a thorough evaluation of various optimization techniques, we determined that the simulated annealing-enhanced GA (SA-GA) offers superior improvements in lithography simulations, thus optimizing
-
Application of high-speed atomic force microscopy in visualizing the dynamics of synthetic polymers Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Takayuki Uchihashi, Yuichiro Nishizawa
High-speed atomic force microscopy (HS-AFM) is a technique that enables real-time imaging of nanoscale phenomena in solution. It was originally developed to visualize biomolecules, whose dynamics in solution significantly affect the manifestation of their functions, and has contributed to the understanding of molecular mechanisms based on the observation of single-molecule dynamics of proteins. In
-
Investigation of single-particle detection of continuous-wave coherent Doppler lidar: theoretical feasibility and performance comparison with multiple-particle detection state Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Shumpei Kameyama
Single-particle detection with a continuous-wave coherent Doppler lidar (CW-CDL) is an interesting event. Even though some experimental results have been shown in previous literature as evidence of single-particle detection, these results have not been verified from a theoretical point of view. Here, the performance of a CW-CDL with single-particle detection is investigated. Examples of single-particle
-
Wafer reconstitution: embedded multi-die III-V and silicon co-integration platform Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Gauri Karve, Yunlong Li, Vasyl Motsnyi, Wei Wei, Jakob Visker, François Chancerel, Jan Ackaert, Renaud Puybaret, Barundeb Dutta, Deniz Sabuncuoglu Tezcan, Lan Peng, Philippe Soussan, Simone Severi, Haris Osman
Co-integration of III-V and silicon on the same substrate can enable many applications in photonics, RF, imaging, and sensing. Wafer reconstitution (WARE) is an embedded multi-die integration platform that allows for the integration of heterogenous materials on 200/300 mm Si substrates. This paper describes an integration flow for InP dies attached to 200 mm silicon. Electrical measurements on InGaAs
-
Wireless wavelength measurement system with temperature compensation using filter-free wavelength sensors Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 I. H. Kwon, Y. J. Choi, T. Ide, K. Takahashi, T. Noda, K. Sawada
Portable wavelength detection systems have been developed for various environmental and biochemical applications. Conventional systems have some limitations as they are unable to adapt to changes in wavelength and rely on optical filters or slits to distinguish between different wavelengths. To address these limitations, a filter-free wavelength sensor system was proposed, utilizing the absorption
-
Ultrasonic velocity change imaging of a human forearm Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Koki Nakata, Kenji Wada, Tetsuya Matsuyama, Koichi Okamoto, Toshiyuki Matsunaka
We have investigated noninvasive imaging of the adipose region in the living human body, utilizing an ultrasonic velocity change (UVC) method caused by body temperature change. Our primary goal is to determine the optimal measurement conditions for acquiring effective UVC images. To achieve this objective, we applied the UVC method to the forearm area, which is easily comprehensible in terms of the
-
Disappearance of cobalt particles above nanocrystalline diamond films by HF-CVD on cemented tungsten carbide Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Takahiro Bando, Yuki Miyahara, Yoshinori Saiki, Jumpei Kito, Seiya Watanabe, Hirofumi Takikawa, Takahiro Hattori, Hiroaki Sugita
In this study, the possibility of the disappearance of Co particles on the surface of nanocrystalline diamond (NCD) films with large thicknesses was examined. It is shown that the number of Co particles decreased clearly with larger thicknesses. In the thickest case, the Co particles disappeared almost completely. Investigation with energy-dispersive spectroscopy for the cross section of the NCD films
-
Analysis of multimode radiation from 0.4 THz backward wave oscillator Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Yuta Annaka, Akira Sugawara, Yuma Kokubo, Aoi Takebuchi, Kazuto Funaki, Rei Matsuzaki, Touta Iguchi
A terahertz backward wave oscillator (BWO) is a high-power terahertz wave source based on the Cherenkov interaction between an electron beam and a slow backward wave. Excitation of slow wave modes with different mode numbers degrades the performance of BWO due to mode competition. Analyzing the mode spectrum is a difficult challenge to confirm single mode operation. In this study, the excitation of
-
Dissolution dynamics of zirconia nanocluster resist Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Yuko Tsutsui Ito, Takahiro Kozawa, Kazuo Sakamoto, Makoto Muramatsu
The metal oxide resists are promising materials for the high numerical aperture EUV lithography. In the metal oxide resists, the bridging ligands are generated upon exposure to radiations, which results in the formation of a pattern insoluble in developers. In this study, the dissolution dynamics of zirconia nanocluster resist was investigated using a quartz crystal microbalance method. The ligand
-
Feature correlation method for image reconstruction evaluation in under-sampled scanning probe microscopy Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Keiichi Ueda, Zhuo Diao, Linfeng Hou, Hayato Yamashita, Masayuki Abe
We introduce an advanced feature-correlation approach for evaluating the accuracy of data completion in scanning probe microscopy (SPM). Our method utilizes characteristic patterns from conventional SPM images and their reconstructions via data interpolation. We develop a refined comparative evaluation algorithm based on correlation coefficients. This algorithm provides a precise assessment by effectively
-
Redox-induced changes in nanostructures and electron densities of connected Pt–Fe catalysts for fuel cells revealed via in situ coherent X-ray diffraction Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Yuki Takayama, Takanori Itoh, Hideto Imai, Hidenori Kuroki, Takeo Yamaguchi
In a sustainable society, polymer electrolyte fuel cells are one of the promising energy devices for automobiles and residential uses because of their high energy efficiency. On the other hand, the current cathode catalysts are mainly made of precious metals such as Pt, and their activity and durability have become an issue for their widespread use. Carbon-free, connected Pt–Fe-alloy catalysts have
-
A 1.58 nJ/conversion temperature-to-digital converter with low power variations Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Mao-Wei Lee, Hongchin Lin, Po-Wei Lai, Ching-Hsiang Chang, Yao-Ting Jian
A 1.58 nJ/conversion temperature-to-digital converter at the supply voltage of 0.7 V was designed and fabricated on the die area of 0.147 mm2 using the 90 nm CMOS technology. The sub-nA constant reference current (I ref) and the sub-nA complementary-to-absolute temperature (CTAT) current (I CTAT) are generated by employing the gate leakage currents of PMOSFETs. The current-to-frequency oscillators
-
Ultrasensitive wireless quartz crystal microbalance bio/gas sensors Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Hirotsugu Ogi
A quartz crystal microbalance (QCM) sensor can detect various physical and chemical properties, including biomolecules, gases, external forces, and so on, through changes in its resonance frequency. Because of the extremely high temperature stability of the resonance frequency, no thermostatic device is required, making the entire system compact. The sensitivity is governed by the thinness of the quartz
-
7.4 nm linewidth Pt nanowires by electron-beam lithography using non-chemically amplified positive-tone resist and post-exposure bake Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-08 Ryo Toyama, Yutaka Majima
7.4 nm linewidth Pt nanowires were demonstrated on SiO2/Si substrates via electron-beam lithography using a non-chemically amplified positive resist ZEP520A and post-exposure bake (PEB) treatment. The effect of the PEB treatment conditions on the nanowires’ characteristics was investigated. As the PEB temperature and time increased, a decrease in the mean linewidth and an improvement of the line-width
-
First-principles study on shape of intrinsic hBN island nucleated during CVD initial growth on Cu(111) Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-05 Ryo Imamura, Hiroyuki Kageshima
Using the first-principles calculation, the shape of the hexagonal boron nitride (hBN) islands was investigated, with a focus on the edge of the small monolayer hBN islands on Cu(111) and intrinsic nucleation during the CVD initial growth. Several key observations were made. First, desorption does not play a decisive role in shaping the islands. Second, for small islands, there is no chemical potential
-
Comparison of field-cooling DC poling and AC poling for lead perovskite relaxor-PbTiO3 single crystals grown by a continuous feeding Bridgman process Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-05 Yohachi Yamashita, Yushi Yamagata, Yu Xiang, Hiroshi Maiwa, Zhengze Xu, Xiaoning Jiang
We investigated the effectiveness of poling processes for Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals (SCs) produced using a continuous feeding Bridgman method, which is known to produce a high property uniformity. The four studied poling processes are: (I) standard direct current poling (STD-DCP); (II) low-voltage field-cooling DCP (LV-FCP); (III) high-voltage field-cooling DCP (HV-FCP); and (IV) mid-temperature
-
Integrated model membrane for biophysical studies and biomedical applications Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-05 Kenichi Morigaki
The biological membrane is a dynamic supramolecular architecture that plays vital roles in the cell. However, understanding the physicochemical properties and functions of the membrane supramolecular system is difficult. We have developed an integrated model system of the biological membrane comprising patterned polymeric and natural lipid bilayers. The polymeric bilayer acts as a framework to support
-
Self-assembling mechanism of Si-QDs on thermally grown SiO2 Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-05 Jongeun Baek, Yuki Imai, Ryoya Tsuji, Katsunori Makihara, Seiichi Miyazaki
The self-assembling formation of Si quantum dots (Si-QDs) on as-grown SiO2 layers was shown by controlling the early stages of low-pressure chemical vapor deposition of SiH4. The QD height and radius distributions assessed by atomic force microscopy and scanning electron microscopy images revealed that the Si-QDs become hemispherical due to them being rate-limited by aggregation, which reduces the
-
Investigation on vector Doppler method for carotid artery wall with focused transmit beams produced from a cross-shaped probe Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-05 Tatsuya Yano, Hiromu Fujisawa, Masaaki Omura, Ryo Nagaoka, Kozue Saito, Hideyuki Hasegawa
Conventional methods for estimating 1D or 2D velocities were developed for the dynamic measurement of carotid walls. However, a carotid wall moves in 3D due to a heart pulsation, and the wall motion velocity in the longitudinal-axis cross-section is affected by out-of-plane displacements that cannot be measured with a 1D array probe. To estimate the out-of-plane displacement, we proposed the cross-shaped
-
Resistive switching memory using buckybowl sumanene-inserted bilayer graphene Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-05 Eito Ashihara, Ryoichi Kawai, Ryousuke Ishikawa, Yuichiro Mitani
The bowl-shaped molecules of the nanocarbon material called sumanene have structural flexibility (bowl inversion). In the case of the sumanene molecule used as an intercalant between graphene layers, it has been predicted that holes and electrons are unevenly distributed according to the bowl inversion. Using the property of sumanene molecules, we expected that resistive switching for the nonvolatile
-
Effects of beam steering angle and excitation frequency on blood flow imaging with plane wave imaging Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-05 Takatoshi Maru, Masaaki Omura, Ryo Nagaoka, Kozue Saito, Hideyuki Hasegawa
The vector Doppler method was developed to overcome the limitations of conventional methods, which can only estimate axial velocities. Because the vector Doppler method uses steered beams, the excitation frequency is set lower than the resonance frequency of the transducer elements to prevent the generation of grating lobes. Although lowering the steering angle is another solution, a larger steering
-
Distortions of parabolic mirror optics for stereophonic lithography and prospects of compensations Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-04 Toshiyuki Horiuchi, Jun-Ya Iwasaki, Hiroshi Kobayashi
The distortions of parabolic mirror optics used for stereophonic projection lithography were investigated. It has already been demonstrated that resist patterns are replicable on gently curved surfaces using mirror optics composed of faced paraboloids of revolution. However, it was found that replicated resist patterns were somewhat distorted from the original patterns. The distortions were caused
-
A high-power ultrasonic transducer operated in MHz range by circular plate bending mode using a single parabolic reflector Jpn. J. Appl. Phys. (IF 1.5) Pub Date : 2024-04-03 Weiquan Wang, Kyohei Yamada, Hiroshi Hasegawa, Kohsuke Hirano, Takeshi Morita
This research developed a HF, high-power ultrasonic transducer. Operating at 1.54 MHz, the transducer generated plane waves through the excitation of the thickness mode of a piezoelectric ring. These waves are subsequently focused by a parabolic reflector, exciting the bending mode of a circular plate and yielding substantial mechanical output at the center. Under a driving voltage of 48 Vpp, the transducer