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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 12 — Jun. 15, 2007
  • pp: 1614–1616

Authentication labels based on guided-mode resonant filters

Mount-Learn Wu, Che-Lung Hsu, Hsiao-Chin Lan, Hung-I Huang, Yung-Chih Liu, Zong-Ru Tu, Chien-Chieh Lee, Jian-Shian Lin, Chih-Chieh Su, and Jenq-Yang Chang  »View Author Affiliations


Optics Letters, Vol. 32, Issue 12, pp. 1614-1616 (2007)
http://dx.doi.org/10.1364/OL.32.001614


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Abstract

A guided-mode resonance (GMR) filter with wide angular tolerances is experimentally demonstrated as an authentication label illuminated with unpolarized white light. The proposed filter, based on a free-standing silicon nitride membrane suspended on a silicon substrate, is fabricated by using anisotropic wet etching to remove the substrate beneath the silicon nitride layer. Both grating and waveguide structures without a lower cladding layer, i.e., a substrate, are fabricated simultaneously on a silicon nitride membrane. Since the silicon nitride is transparent within the spectra of visible and infrared light, such suspended-membrane-type GMR filters are well suited for applications within the visible spectrum. Moreover, the high refractive index of silicon nitride allows the proposed filters to have strongly modulated gratings and an immunity to high angular deviation. The measured reflection resonance has an angular tolerance up to ± 5 ° under normal incidence for the wavelength of 629.5 nm .

© 2007 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(120.2440) Instrumentation, measurement, and metrology : Filters
(220.4610) Optical design and fabrication : Optical fabrication
(230.7390) Optical devices : Waveguides, planar

ToC Category:
Optical Devices

History
Original Manuscript: March 1, 2007
Revised Manuscript: March 22, 2007
Manuscript Accepted: March 28, 2007
Published: June 5, 2007

Citation
Mount-Learn Wu, Che-Lung Hsu, Hsiao-Chin Lan, Hung-I Huang, Yung-Chih Liu, Zong-Ru Tu, Chien-Chieh Lee, Jian-Shian Lin, Chih-Chieh Su, and Jenq-Yang Chang, "Authentication labels based on guided-mode resonant filters," Opt. Lett. 32, 1614-1616 (2007)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-32-12-1614


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