Micromachines | |
Design of an Angle Detector for Laser Beams Based on Grating Coupling | |
Tapas Kumar Saha2  Mingyu Lu2  Zhenqiang Ma1  | |
[1] Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA;Department of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76019, USA; | |
关键词: diffraction gratings; guided waves; laser beam steering; | |
DOI : 10.3390/mi3010036 | |
来源: mdpi | |
【 摘 要 】
A novel angle detector for laser beams is designed in this paper. It takes advantage of grating coupling to couple the incident light into a slab waveguide; and, the incident light’s angle can be determined by reading the outputs of light detectors within the waveguide. This device offers fast-responding on-chip detection of laser beam’s angle. Compared to techniques based on quadrant photodiodes or lateral effect photodiodes, the device in this paper has far greater detectable range (up to a few degrees, to be specific). Performance of the laser angle detector in this paper is demonstrated by 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 laser beam angle detector in this paper is expected to find various applications such as ultra-fast optical interconnects.
【 授权许可】
CC BY
© 2012 by the authors; licensee MDPI, Basel, Switzerland.
【 预 览 】
Files | Size | Format | View |
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RO202003190045992ZK.pdf | 411KB | download |