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Proceedings Paper

Progress and prospects of silicon-based design for optical phased array
Author(s): Weiwei Hu; Chao Peng; Connie Chang-Hasnain
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Paper Abstract

The high-speed, high-efficient, compact phase modulator array is indispensable in the Optical-phased array (OPA) which has been considered as a promising technology for realizing flexible and efficient beam steering. In our research, two methods are presented to utilize high-contrast grating (HCG) as high-efficient phase modulator. One is that HCG possesses high-Q resonances that origins from the cancellation of leaky waves. As a result, sharp resonance peaks appear on the reflection spectrum thus HCGs can be utilized as efficient phase shifters. Another is that low-Q mode HCG is utilized as ultra-lightweight mirror. With MEMS technology, small HCG displacement (~50 nm) leads to large phase change (~1.7π). Effective beam steering is achieved in Connie Chang-Hasnian’s group. On the other hand, we theoretically and experimentally investigate the system design for silicon-based optical phased array, including the star coupler, phased array, emission elements and far-field patterns. Further, the non-uniform optical phased array is presented.

Paper Details

Date Published: 15 March 2016
PDF: 9 pages
Proc. SPIE 9757, High Contrast Metastructures V, 97570U (15 March 2016); doi: 10.1117/12.2214155
Show Author Affiliations
Weiwei Hu, Peking Univ. (China)
Chao Peng, Peking Univ. (China)
Connie Chang-Hasnain, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 9757:
High Contrast Metastructures V
Connie J. Chang-Hasnain; David Fattal; Fumio Koyama; Weimin Zhou, Editor(s)

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