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Proceedings Paper

Narrow band pass filter using birefringence film and quarter-wave film
Author(s): Dong-kun Lee; Jang-Kun Song
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Paper Abstract

While a pixel in a color image has three colorimetric information of RGB, that in a spectral image contains full spectral information, several tens times more information compared to the color image. Hence, the spectral image is widely applicable in biology, material science, and environmental science. Although several methods for spectral image acquisition have been suggested to date, those methods are expensive, bulky, or slow in actual device. In this work, we designed a novel type of tunable narrow band-pass filter using rotatable polarizer, quarter-wave plate, and birefringence films. Different from the conventional Lyot-Ohman type filter, we do not use a liquid crystal layer. The selection of wavelength is made by rotating the polarizer in our filter set, and adopted a piezoelectric rotational actuator for that. We simulated to find the optimal conditions of the filter set, and finally, fabricated a filter module. The minimum band width was 5 nm, which is suitable for usual spectral imaging and can be reduced further if necessary, and the wavelength of light passing through the filter set was continuously selectable. After setting the filter in a microscope, we obtained a spectral image set for a bio sample that contained full spectrum information in each pixel. Using image processing, we could demonstrate to read out the spectral information for any selected position.

Paper Details

Date Published: 7 March 2016
PDF: 6 pages
Proc. SPIE 9769, Emerging Liquid Crystal Technologies XI, 97691A (7 March 2016); doi: 10.1117/12.2231147
Show Author Affiliations
Dong-kun Lee, Sungkyunkwan Univ. (Korea, Republic of)
Jang-Kun Song, Sungkyunkwan Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 9769:
Emerging Liquid Crystal Technologies XI
Liang-Chy Chien; Dick J. Broer; Hirotsugu Kikuchi; Nelson V. Tabiryan, Editor(s)

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