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30 January 2020 Submicron guided-mode-resonance filter for wide bandwidth near-infrared polarizer
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We aim to present a design for a submicron polarizer in the near-infrared (IR) wavelength range with a wide bandwidth that can be fabricated using conventional thin-film microfabrication technology to reduce costs. A near-IR transverse magnetic polarizer with 95% transmittance at 2400 nm, more than 1000-nm resonance peak bandwidth, and an extinction ratio (ER) of 300 was designed using a gold wire grid-based guided-mode-resonance filter with a 700-nm grating width and 1200-nm grating period. The ER can be increased by increasing the wire grid thickness, but in this case, its resonance peak moves to longer wavelengths. A cavity resonance was found to exist between two adjacent wire grids when the grid thickness is >800  nm.

© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2020/$28.00 © 2020 SPIE
Marzia Zaman, Ligang Chen, and Simon Ang "Submicron guided-mode-resonance filter for wide bandwidth near-infrared polarizer," Optical Engineering 59(1), 014116 (30 January 2020).
Received: 9 October 2019; Accepted: 15 January 2020; Published: 30 January 2020

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