Abstract-Broadband and wide angle infrared wire-grid polarizer

Ming Dai,1 Weiwei Wan,1 Xueyi Zhu,1 Baosheng Song,1 Xiaoping Liu,1 Minghui Lu,1,* Bo Cui,2 and Yanfeng Chen1
1 National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China 2 Department of Electrical and Computer Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L3G1, Canada * luminghui@nju.edu.cn
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Abstract: An infrared polarizer consisting of metal-insulator-metal (MIM) gratings is designed with transmittance exceeding 85% and polarization extinction ratio (ER) higher than 70 dB in the wavelength range from 1.5 to 8 μm. Moreover, the polarizer retains excellent performance even when the incident angle increases to as large as 80°. The MIM gratings support magnetic polariton (MP) in the near-infrared regime and operate nonresonantly in the mid-infrared regime, both of which result in the advantages of high extinction ratio, broadband, and wide angle. The proposed structure can find applications in polarizer, beam-splitter, filter, and isolator in the infrared range.
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