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27 February 2015 On-chip broadband spectral filtering using planar double high-contrast grating reflectors
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Proceedings Volume 9372, High Contrast Metastructures IV; 93720O (2015)
Event: SPIE OPTO, 2015, San Francisco, California, United States
We propose a broadband free-space on-chip spectrometer based on an array of integrated narrowband filters consisting of Fabry-Perot resonators formed by two high-contrast grating (HCG) based reflectors separated by a low-index thin layer with a fixed cavity thickness. Using numerical simulations, broadband tunability of resonance wavelengths was achieved only by changing the in-plane grating parameters such as period or duty cycle of HCGs while the substrate geometry was kept fixed. Experimentally, the HCG reflectors were fabricated on silicon on insulator (SOI) substrates and high reflectivity was measured, fabrication process for the proposed double HCG-based narrowband filter array was developed. The filtering function that can be spanned over a wide range of wavelengths was measured.
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Yu Horie, Amir Arbabi, and Andrei Faraon "On-chip broadband spectral filtering using planar double high-contrast grating reflectors", Proc. SPIE 9372, High Contrast Metastructures IV, 93720O (27 February 2015);

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