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Proceedings Paper

Design of second order grating couplers to detect the angle and polarization of the laser beam
Author(s): Tapas Kumar Saha; Mingyu Lu; Deyin Zhao; Zhenqiang Ma; Weidong Zhou
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Paper Abstract

On-chip laser beam tracking finds innumerable applications. Popularly adopted quadrant photodiodes can only detect laser beam's angle variation up to 0.2° reliably. In this paper, a novel angle detector is designed based on grating coupling. It consists of a grating layer on top of a silicon-on-insulator slab waveguide. The incident light is coupled into guided modes within the waveguide via the grating layer, and then, the incident light's angle can be determined by reading the outputs of light detectors within the waveguide. Performance of the laser angle detector in this paper is demonstrated by full-wave finite-difference-time-domain simulations. Numerical results show that, the detectable angle range can be adjusted by several design parameters and can reach [-4°, 4°]. The device structure in this paper can be straightforwardly extended to two-dimensional photonic crystal configurations.

Paper Details

Date Published: 23 February 2012
PDF: 9 pages
Proc. SPIE 8270, High Contrast Metastructures, 82700M (23 February 2012); doi: 10.1117/12.907742
Show Author Affiliations
Tapas Kumar Saha, The Univ. of Texas at Arlington (United States)
Mingyu Lu, The Univ. of Texas at Arlington (United States)
Deyin Zhao, The Univ. of Texas at Arlington (United States)
Zhenqiang Ma, Univ. of Wisconsin-Madison (United States)
Weidong Zhou, The Univ. of Texas at Arlington (United States)

Published in SPIE Proceedings Vol. 8270:
High Contrast Metastructures
Connie J. Chang-Hasnain; Fumio Koyama; Alan Eli Willner; Weimin Zhou, Editor(s)

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