Theoretical reflective performance of a sandwiched two-layer grating polarizer |
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| Affiliation: | 1. Universidad Nacional de Río Cuarto, Departamento de Química, Ruta 36 km 601, Río Cuarto, Córdoba 5800, Argentina;2. Saarland University, Department of Materials Science, Campus, D-66123 Saarbrücken, Germany;1. Institute of Biomedicine, Research Area for Women''s Health, Facultad de Ciencias Médicas, Universidad Católica de Santiago de Guayaquil, Guayaquil, Ecuador;2. Department of Obstetrics and Gynecology, Facultad de Medicina, Lozano Blesa University Hospital, Universidad de Zaragoza, Spain;3. Department of Clinical and Experimental Medicine, Division of Obstetrics and Gynecology, University of Pisa, Italy;1. Changchun University of Science and Technology, JR3CN & CNM, Changchun 130022, China;2. University of Bedfordshire, JR3CN & IRAC, Luton LU1 3JU, UK;3. Xi’an Jiaotong-Liverpool University, DCSSE, Suzhou 215123, China;4. Tampere University of Technology, ORC, Tampere FIN-33101, Finland;1. College of Physics and Optoelectronic Technology, Baoji University of Arts and Sciences, Baoji 721016, PR China;2. Baoji Key Laboratory of Ultrafast Spectroscopy, Baoji 721016, PR China;3. College of Physics and Information Technology, Shaanxi Normal University, Xi⿿an 710062, PR China |
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| Abstract: | The reflective polarizer is described by a sandwiched two-layer grating with a metal slab. Such a new polarizer is aimed to improve the performance of a reflective grating-based polarizer. The grating is optimized with the usual duty cycle of 0.5, where TE and TM polarizations are reflected in the –1st and the 0th diffraction orders, respectively. With optimized grating parameters, the extinction ratio can reach 45.5 dB and 41.9 dB in two diffraction orders, which are greatly improved compared with the conventional reported surface grating polarizer with the simple structure. Attractive merits of the new design are high efficiency, high extinction ratio, wide incident wavelength bandwidth for TE polarization, and wide angular range for TM polarization. Numerical results are expected to open new opportunities for the design of a grating-based polarizer with the enhanced performance by the complicated grating configuration. |
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| Keywords: | Extinction ratio Sandwiched grating Wide bandwidth |
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