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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 36 — Dec. 20, 2009
  • pp: 6973–6979

Matched spectral filter based on reflection holograms for analyte identification

Liangcai Cao and Claire Gu  »View Author Affiliations


Applied Optics, Vol. 48, Issue 36, pp. 6973-6979 (2009)
http://dx.doi.org/10.1364/AO.48.006973


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Abstract

A matched spectral filter set that provides automatic preliminary analyte identification is proposed and analyzed. Each matched spectral filter in the set containing the multiple spectral peaks corresponding to the Raman spectrum of a substance is capable of collecting the specified spectrum into the detector simultaneously. The filter set is implemented by multiplexed volume holographic reflection gratings. The fabrication of a matched spectral filter in an Fe : Li Nb O 3 crystal is demonstrated to match the Raman spectrum of the sample Rhodamine 6G (R6G). An interference alignment method is proposed and used in the fabrication to ensure that the multiplexed gratings are in the same direction at a high angular accuracy of 0.0025 ° . Diffused recording beams are used to control the bandwidth of the spectral peaks. The reflection spectrum of the filter is characterized using a modified Raman spectrometer. The result of the filter’s reflection spectrum matches that of the sample R6G. A library of such matched spectral filters will facilitate a fast detection with a higher sensitivity and provide a capability for preliminary molecule identification.

© 2009 Optical Society of America

OCIS Codes
(050.7330) Diffraction and gratings : Volume gratings
(090.4220) Holography : Multiplex holography
(160.3730) Materials : Lithium niobate
(160.5320) Materials : Photorefractive materials
(300.6190) Spectroscopy : Spectrometers

ToC Category:
Spectroscopy

History
Original Manuscript: October 9, 2009
Manuscript Accepted: November 15, 2009
Published: December 11, 2009

Citation
Liangcai Cao and Claire Gu, "Matched spectral filter based on reflection holograms for analyte identification," Appl. Opt. 48, 6973-6979 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-36-6973

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