Design of second order grating couplers to detect the angle and polarization of the laser beam

Tapas Kumar Saha; Mingyu Lu; Deyin Zhao; Zhenqiang Ma; Weidong Zhou

doi:10.1117/12.907742

23 February 2012 Design of second order grating couplers to detect the angle and polarization of the laser beam

Tapas Kumar Saha, Mingyu Lu, Deyin Zhao, Zhenqiang Ma, Weidong Zhou

Proceedings Volume 8270, High Contrast Metastructures; 82700M (2012) https://doi.org/10.1117/12.907742
Event: SPIE OPTO, 2012, San Francisco, California, United States

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.

Citation Download Citation

Tapas Kumar Saha, Mingyu Lu, Deyin Zhao, Zhenqiang Ma, and Weidong Zhou "Design of second order grating couplers to detect the angle and polarization of the laser beam", Proc. SPIE 8270, High Contrast Metastructures, 82700M (23 February 2012); https://doi.org/10.1117/12.907742

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