The Imbert–Fedorov (IF) shift, which refers to a tiny transverse splitting induced by spin–orbit interaction at a reflection/refraction interface, is sensitive to the refractive index of a medium and momentum state of incident light. Most studies have focused on the shift for an incident light beam with a spin angular momentum (SAM), i.e., circular polarization. We demonstrate experimentally that the relative IF shifts of vortex beams with large opposite orbital angular momentums (OAMs) are highly enhanced in resonant structures when light refracts through a double-prism structure (DPS), in which the thickness and temperature of the air gap are precisely sensed via the observed relative IF shifts. The thickness and temperature sensitivities increase as the absolute value of opposite OAMs increases. Our results offer a technological and practical platform for applications in sensing of thickness and temperature, ingredients of environment gas, spatial displacement, chemical substances and deformation structure.

中文翻译：

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增强涡旋光束的相反 Imbert-Fedorov 位移，用于精确感测温度和厚度

英伯特-费多罗夫（IF）位移是指反射/折射界面处自旋轨道相互作用引起的微小横向分裂，对介质的折射率和入射光的动量状态敏感。大多数研究都集中在具有自旋角动量（SAM）（即圆偏振）的入射光束的偏移上。我们通过实验证明，当光通过双棱镜结构（DPS）折射时，具有大相反轨道角动量（OAM）的涡旋光束的相对中频位移在谐振结构中大大增强，其中气隙的厚度和温度为通过观察到的相对 IF 偏移进行精确感测。厚度和温度敏感性随着相反 OAM 绝对值的增加而增加。我们的成果为厚度和温度、环境气体成分、空间位移、化学物质和变形结构传感等应用提供了技术和实践平台。