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Updated: May 22, 2026

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Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
Published on: July 18, 2015
Broadband long-wavelength infrared Si/SiO2 subwavelength grating reflector
Justin M Foley1, Anne M Itsuno, Tanya Das
1Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109, USA. foleyjm@umich.edu
Optics Letters
|May 5, 2012
Abstract:
A long-wavelength IR broadband reflector is demonstrated using a high-index-contrast subwavelength grating based on a Si/SiO2 system. The field response has been computationally and experimentally verified to exhibit broadband reflectance in the spectral range of 13-16 μm with Δλ/λ=18.5% for reflectance >70%. The gratings exhibit incident field polarization dependence with an average extinction ratio of 1:1.6.

