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Title: Diffraction grating scanner using a micromachined resonator
Authors: Zhou, G. 
Logeeswaran, V.J. 
Tay, F.E.H. 
Chau, F.S. 
Issue Date: 2004
Citation: Zhou, G.,Logeeswaran, V.J.,Tay, F.E.H.,Chau, F.S. (2004). Diffraction grating scanner using a micromachined resonator. Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS) : 45-48. ScholarBank@NUS Repository.
Abstract: We present a micromachined resonant diffraction grating laser scanner that utilizes in-plane angular vibration of a planar diffraction grating causing the diffracted laser beam to scan. The scanner consists of an electrostatic comb-drive microresonator and a diffraction grating plate having a grating period of 4 μm. The proposed micromachined diffraction grating laser scanner has the potential to scan at high frequencies without the optical performance degradation due to dynamic non-rigid-body deformation compared to out-of-plane micromirror scanners. A prototype grating scanner has been fabricated using the Poly-MUMPS process. It is capable of scanning optical angles of 1.31° (1 st-order), 2.13° (2 nd-order) and 3.42° (3 rd-order) at a resonant frequency of 7.67 kHz for a 635-nm-wavelength incident laser beam, when driven by the electrostatic combdrive push-pull mechanism with 20 V DC bias and 20 V p-p AC voltages. The scanning angle of the device can be significantly increased by reducing the grating period to sub-wavelength level.
Source Title: Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS)
ISSN: 10846999
Appears in Collections:Staff Publications

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