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Updated: Jun 27, 2026
Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
Published on: July 18, 2015
Chip-scale dispersion engineering using chirped vertical gratings
D T H Tan1, K Ikeda, R E Saperstein
1Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA 92093-0409, USA. thtan@ucsd.edu
Abstract:
A strongly coupled, chirped Bragg grating made by sinusoidally modulating the sidewalls of a silicon waveguide is designed, fabricated, and experimentally characterized. By varying the device parameters, the operating wavelength, device bandwidth, sign (normal or anomalous), and magnitude of group-velocity dispersion may be engineered for specific photonic applications. Asymmetric Blackman apodization is best suited for maximizing the useable bandwidth while providing good ripple suppression. Dispersion values up to 7.0 x 10(5) ps/nm/km are demonstrated at 1.55 microm.
