In this paper, an optical privacy protection (OPP) structure is designed for violet light, leveraging the unique epsilon-near-zero (ENZ) properties of YaBaCuO material along with an anti-reflection structure. To tackle the challenges posed by temperature regulation constraints, the zinc fluoride barium lanthanum aluminum magnesium hexafluoride glass is incorporated as the background medium. The findings indicate that this proposed configuration demonstrates a remarkable transmissivity exceeding 91 % in the TM wave for angles ranging from −30°∼ 30°. It is worth noting that the transmittance significantly drops close to zero beyond –33.7° or 33.7° angles. Moreover, an impressive transmittance of over 98 % is achieved within the TE wave range of −30°∼ 30°, while experiencing a sharp decline towards nearly zero beyond –33.9° or 33.9° angles. The designed OPP effectively operates across the frequency range of 680 ∼ 790 terahertz, encompassing the violet optical spectrum. It consistently exhibits a rectangular coefficient exceeding 0.84 in the TE wave and surpasses 0.87 in the TM wave, demonstrating its exceptional performance characteristics within these respective modes.

中文翻译：

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基于ε-近零角选择原理的紫光隐私保护理论研究

在本文中，利用YaBaCuO材料独特的ε近零（ENZ）特性以及抗反射结构，为紫光设计了光学隐私保护（OPP）结构。为了解决温度调节限制带来的挑战，采用氟化锌钡镧铝镁六氟化物玻璃作为背景介质。研究结果表明，这种提出的配置在 TM 波中对于 -30°∼ 30° 的角度范围表现出超过 91% 的显着透射率。值得注意的是，超过 –33.7° 或 33.7° 角度时，透射率显着下降至接近于零。此外，在-30°～30°的TE波范围内实现了超过98%的令人印象深刻的透射率，而在超过–33.9°或33.9°角度时，透射率急剧下降到接近于零。设计的 OPP 可在 680 ∼ 790 太赫兹频率范围内有效运行，涵盖紫光光谱。它在 TE 波中始终表现出超过 0.84 的矩形系数，在 TM 波中超过 0.87，展示了其在这些各自模式下的卓越性能特征。