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Published on: November 25, 2009
Broadband infrared mirror using guided-mode resonance in a subwavelength germanium grating
Juha M Kontio1, Janne Simonen, Kari Leinonen
1Optoelectronics Research Centre, Tampere University of Technology, P.O. Box 692, FIN-33101, Tampere, Finland. juha.kontio@tut.fi
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.

