A mixed metal dielectric sandwiched grating for polarization-selective reflection |
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| Institution: | 1. School of Automotive Studies, Tongji University, Shanghai 201804, China;2. Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems, China;1. Wuhan University, Electronic Information School, Wuhan 430072, China;2. Science and Technology Electro-Optic Control Laboratory, Luoyang 471009, China;3. Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China;1. Department of Photoelectric Information Science and Engineering, School of Science, Jiangnan University, Wuxi 214122, China;2. Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, School of Science, Jiangnan University, Wuxi 214122, China |
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| Abstract: | A mixed metal dielectric sandwiched grating is described for polarization-selective reflection. The novel grating is composed of substrate, metal slab, two dielectric grating layers, and covering layer. The polarization-selective grating is optimized by using rigorous coupled-wave analysis for the usual duty cycle of 0.5. With the optimized grating parameters, reflective efficiency of 96.49% can be diffracted into the ?1st order for TE polarization. And two-port output of 48.26%/48.27% can be diffracted into the 0th and the ?1st orders for TM polarization. Polarization-selective reflection with good performance can be obtained by the mixed metal dielectric sandwiched grating. The usual duty cycle of 0.5 makes it easy and simple to be fabricated for practical applications. Moreover, the polarization-selective beam splitter based on the mixed metal dielectric sandwiched grating has advantages of wide incident wavelength range for TE polarization and angular bandwidth for TM polarization. |
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| Keywords: | Reflective efficiency Two-layer grating Covering layer |
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