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Proceedings Paper

Stray-light analysis for multimodal miniature microscope
Author(s): Junwon Lee; Jeremy D. Rogers; Chen Liang; Rebecca R. Richards-Kortum; Michael R. Descour
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Paper Abstract

Most conventional imaging systems suffer from unwanted and unexpected stray light that is often caused by reflections and scattering from optics and opto-mechanical features. This problem is easily missed during a design procedure that concentrates on improvement of imaging performance. The problem becomes apparent at the final step of production in most cases. If an imaging system consists of micro-optics, a stray light problem may become more difficult to solve due to the system's micro-scale size. The purpose of this stray light analysis is to improve imaging performance of the multi-modal miniature microscope (4M). The 4M device is a complete microscope on a chip, including optical, micro-mechanical, and electronic components. The 4M device is potentially a useful tool for early detection of pre-cancer due to its very compact size and capability for microscopic-scale imaging. Before actual fabrication of this device, however, we built the same geometry as the real 4M device in a commercial non-sequential ray tracing code and implemented stray light analysis of 4M device. Our findings indicate that most of the stray light in a 4M device is created by reflection from optics that are nominally supposed to be transparent. Due to a low signal level associated with the object, it is required to add high quality anti-reflection coatings on optics to achieve reasonable SNR.

Paper Details

Date Published: 16 October 2002
PDF: 9 pages
Proc. SPIE 4767, Current Developments in Lens Design and Optical Engineering III, (16 October 2002); doi: 10.1117/12.451324
Show Author Affiliations
Junwon Lee, Optical Sciences Ctr./Univ. of Arizona (United States)
Jeremy D. Rogers, Optical Sciences Ctr./Univ. of Arizona (United States)
Chen Liang, Optical Sciences Ctr./Univ. of Arizona (United States)
Rebecca R. Richards-Kortum, Univ. of Texas at Austin (United States)
Michael R. Descour, Optical Sciences Ctr./Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 4767:
Current Developments in Lens Design and Optical Engineering III
Robert E. Fischer; Warren J. Smith; R. Barry Johnson, Editor(s)

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