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Proceedings Paper

Novel 3D micromirror for miniature optical bio-probe SiOB assembly
Author(s): Janak Singh; Yingshun Xu; C. S. Premachandran; Teo Hui Siang Jason; Nanguang Chen
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Paper Abstract

This article presents design and development of a novel 3D micromirror for large deflection scanning application in invivo optical coherence tomography (OCT) bio-imaging probe. Overall mirror chip size is critical to reduce the diameter of the probe; however, mirror plate itself should not be less than 500 μm as smaller size means reducing the amount of light collected after scattering for OCT imaging. In this study, mirror chip sizes of 1 × 1 mm2 and 1.5 × 1.5 mm2 were developed with respectively 400 and 500 micrometer diameter mirror plates. The design includes electro thermal excitation mechanism in the same plane as mirror plate to achieve 3D free space scanning. Larger deflection requires longer actuators, which usually increase the overall size of the chip. To accommodate longer actuators and keep overall chip size same curved beam actuators are designed and integrated for micromirror scanning. Typical length of the actuators was 800 micrometer, which provided up to 17 degrees deflection. Deep reactive ion etching (DRIE) process module was used extensively to etch high aspect ratio structures and keep the total mirror chip size small.

Paper Details

Date Published: 28 February 2008
PDF: 8 pages
Proc. SPIE 6886, Microfluidics, BioMEMS, and Medical Microsystems VI, 688608 (28 February 2008); doi: 10.1117/12.762544
Show Author Affiliations
Janak Singh, Institute of Microelectronics (Singapore)
Yingshun Xu, Institute of Microelectronics (Singapore)
National Univ. of Singapore (Singapore)
C. S. Premachandran, Institute of Microelectronics (Singapore)
Teo Hui Siang Jason, Institute of Microelectronics (Singapore)
Nanguang Chen, National Univ. of Singapore (Singapore)


Published in SPIE Proceedings Vol. 6886:
Microfluidics, BioMEMS, and Medical Microsystems VI
Wanjun Wang; Claude Vauchier, Editor(s)

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