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Piezo-electrically Actuated Micro Corner Cube Retroreflector (CCR) for Free-space Optical Communication Applications
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 Title & Authors
Piezo-electrically Actuated Micro Corner Cube Retroreflector (CCR) for Free-space Optical Communication Applications
Lee, Duk-Hyun; Park, Jae-Y.;
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In this paper, an extremely low voltage operated micro corner cube retroreflector (CCR) was fabricated for free-space optical communication applications by using bulk silicon micromachining technologies. The CCR was comprised of an orthogonal vertical mirror and a horizontal actuated mirror. For low voltage operation, the horizontal actuated mirror was designed with two PZT cantilever actuators, torsional bars, hinges, and a mirror plate with a size of . In particular, the torsional bars and hinges were carefully simulated and designed to secure the flatness of the mirror plate by using a finite element method (FEM) simulator. The measured tilting angle was approximately at the applied voltage of 5 V. An orthogonal vertical mirror with an extremely smooth surface texture was fabricated using KOH wet etching and a double-SOI (silicon-on-insulator) wafer with a (110) silicon wafer. The fabricated orthogonal vertical mirror was comprised of four pairs of two mutually orthogonal flat mirrors with (length) (height) (thickness). The cross angles and surface roughness of the orthogonal vertical mirror were orthogonal, almost and 3.523 nm rms, respectively. The proposed CCR was completed by combining the orthogonal vertical and horizontal actuated mirrors. Data transmission and modulation at a frequency of 10 Hz was successfully demonstrated using the fabricated CCR at a distance of approximately 50 cm.
MEMS;Orthogonal mirror;Corner cube retroreflector (CCR);Vertical silicon mirror;Piezoelectric actuation;Cantilever;Optical communication;
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