Plasmon-stimulated transformation (conversion) of radiation polarization by Au gratings with different ratios of excitation wavelength to lattice period (including high-frequency lattices with a wavelength to period ratio of close to 2 that are studied for the first time) and with different modulation depths are experimentally studied. Gratings for research are made by interference lithography using chalcogenide photoresists. Polarization conversion is studied by measuring angular dependences (on the incident and azimuthal angles) of the specular reflection of linearly polarized monochromatic He–Ne laser radiation. The maximum conversion efficiency for p-polarized into s-polarized radiation for low-frequency lattices with a period greater than the wavelength and lattices with an intermediate frequency (period slightly less than the wavelength) is found at azimuth ~45^o and is determined by the modulation depth. However, the intensity of the resulting s-component is an order of magnitude less for high-frequency lattices on which surface plasmon-polaritons are excited at high incident angles and azimuthal angles significantly less than 45^o than for lower-frequency lattices. Thus, the efficiency of polarization conversion stimulated by excitation of surface plasmons is determined not only by lattice modulation depth h/d but also by the ratio of the exciting light wavelength to the lattice period λ/d.

中文翻译：

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在金属光栅上激发表面等离振子-极化子后电磁辐射的极化转变

具有不同激发波长与晶格周期比（包括首次研究的波长与周期比接近2的高频晶格）的Au光栅的等离子激发辐射偏振变换（转换）对深度进行了实验研究。使用硫族化物光致抗蚀剂的干涉光刻法制造用于研究的光栅。通过测量线性偏振单色He-Ne激光辐射的镜面反射的角度相关性（入射角和方位角）来研究偏振转换。^Ó和由调制深度来确定。但是，对于高频晶格而言，所得s分量的强度要比低频晶格小一个数量级，在高频晶格上以高入射角和方位角小于45 ^o激发表面等离激元-极化子。因此，由表面等离子体激元的激发所激发的偏振转换的效率不仅由晶格调制深度h / d决定，而且还由激发光波长与晶格周期λ/ d之比决定。