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Broadband infrared mirror using guided-mode resonance in a subwavelength germanium grating

Juha M. Kontio, Janne Simonen, Kari Leinonen, Markku Kuittinen, and Tapio Niemi

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Abstract

We demonstrate a broadband mirror for the IR wavelength region comprising a subwavelength grating made of germanium. We design and optimize the guided-mode resonances in the structure for TM-polarized incident light by rigorous electromagnetic simulations. The grating structure is realized by nanoimprint lithography and dry etching. The reflectivity of the mirror is over 95% for the wavelength range between 2245 and 3080nm.

© 2010 Optical Society of America

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