Silver-film subwavelength gratings for polarizers in the terahertz and mid-infrared regions | Zendy

Kazuo Shiraishi | Zendy; Shogo Higuchi | Zendy; Kengo Muraki | Zendy; Hidehiko Yoda | Zendy

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Silver-film subwavelength gratings for polarizers in the terahertz and mid-infrared regions

Author(s) -

Kazuo Shiraishi,

Shogo Higuchi,

Kengo Muraki,

Hidehiko Yoda

Publication year - 2016

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.24.020177

Subject(s) - polarizer , terahertz radiation , materials science , optics , grating , infrared , optoelectronics , wavelength , substrate (aquarium) , thin film , physics , birefringence , oceanography , nanotechnology , geology

Silver is proposed as a useful metal for thin metal-film subwavelength-grating polarizers in both the terahertz and mid-infrared regions. A triangular Ag-film grating for a terahertz-region polarizer fabricated on a resin substrate showed measured TE-wave losses of higher than 45 dB in the frequency range of 0.5-2.2 THz, while TM-wave losses were lower than 0.75 dB in the range of 0.5-3THz. A triangular double Ag-film grating structure on a thin silicon substrate with an anti-reflection layer on its reverse side was fabricated for the polarizer in the mid-infrared region. Measured TE-wave losses were higher than 27 dB in the wavelength range of 16-21 μm, while the minimum TM-wave loss was 3.5 dB at around the wavelength of 19 μm. Silver films are confirmed to be promising candidates for fabricating high-performance polarizers in the terahertz and mid-infrared regions.

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