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Design of an Angle Detector for Laser Beams Based on Grating Coupling
Department of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76019, USA
Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
* Author to whom correspondence should be addressed.
Received: 24 December 2011; in revised form: 21 January 2012 / Accepted: 21 January 2012 / Published: 1 February 2012
Abstract: 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.
Keywords: diffraction gratings; guided waves; laser beam steering
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Cite This Article
MDPI and ACS Style
Saha, T.K.; Lu, M.; Ma, Z.; Zhou, W. Design of an Angle Detector for Laser Beams Based on Grating Coupling. Micromachines 2012, 3, 36-44.
Saha TK, Lu M, Ma Z, Zhou W. Design of an Angle Detector for Laser Beams Based on Grating Coupling. Micromachines. 2012; 3(1):36-44.
Saha, Tapas Kumar; Lu, Mingyu; Ma, Zhenqiang; Zhou, Weidong. 2012. "Design of an Angle Detector for Laser Beams Based on Grating Coupling." Micromachines 3, no. 1: 36-44.