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Proceedings Paper

An interference microfilter array with tunable spectral response for each pixel
Author(s): Frida E. Strömqvist Vetelino; Ali A. Abtahi; Peter B. Griffin; Ricky J. Morgan; Usha Raghuram; Francisco Tejada
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Paper Abstract

A standing wave spectrometer is turned into a wavelength tunable band-pass filter by the addition of a reflective coating. It results in the standing wave filter (SWF), a miniaturized Fabry-Perot band-pass filter with a semi-transparent detector that can be constructed into a pixel-tunable focal plane array, suitable for hyperspectral imaging applications. The asymmetric Fabry-Perot cavity is formed between the reflective coating and a tunable mirror, originally part of the spectrometer. The predicted performance of the SWF is optimized through modeling based on the matrix formalism used in thin film optics and with FDTD simulations. The SWF concept is taken from an ideal device to a focal plane array design that was fabricated with 40 micron pixels using semi-conductor processing technology. First-light spectra measured from the 100 pixel Standing Wave Filter array agree with predictions and prove the concept.

Paper Details

Date Published: 20 May 2011
PDF: 14 pages
Proc. SPIE 8048, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XVII, 80480M (20 May 2011); doi: 10.1117/12.883822
Show Author Affiliations
Frida E. Strömqvist Vetelino, Aerospace Missions Corp. (United States)
Ali A. Abtahi, Aerospace Missions Corp. (United States)
Peter B. Griffin, Stanford Univ. (United States)
Ricky J. Morgan, Aerospace Missions Corp. (United States)
Usha Raghuram, Aerospace Missions Corp. (United States)
Francisco Tejada, Sensing Machines (United States)

Published in SPIE Proceedings Vol. 8048:
Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XVII
Sylvia S. Shen; Paul E. Lewis, Editor(s)

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