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Chinese Optics Letters

Chinese Optics Letters

| PUBLISHED MONTHLY BY CHINESE LASER PRESS AND DISTRIBUTED BY OSA

  • Vol. 7, Iss. 8 — Aug. 1, 2009
  • pp: 667–670

Optimized guided mode resonant structure as thermooptic sensor and liquid crystal tunable filter

I. Abdulhalim  »View Author Affiliations


Chinese Optics Letters, Vol. 7, Issue 8, pp. 667-670 (2009)


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Abstract

Applicability of guided mode resonant structures to tunable optical filtering and sensing is demonstrated using nematic liquid crystals. As a sensor, a minimum refractive index detectivity of 10^{-5} is demonstrated while as a tunable filter, tunability range of few tens of nanometers with 2-nm bandwidth is presented. The optimum design is achieved by maximizing the evanescent field region in the analyte which maximizes the overlap integral. The device can be operated in reflection or transmission modes at normal incidence. It can also be operated at a single wavelength by measuring the angular profile of the light beam.

© 2009 Chinese Optics Letters

OCIS Codes
(130.2790) Integrated optics : Guided waves
(230.3720) Optical devices : Liquid-crystal devices
(050.5745) Diffraction and gratings : Resonance domain
(050.6624) Diffraction and gratings : Subwavelength structures

Citation
I. Abdulhalim, "Optimized guided mode resonant structure as thermooptic sensor and liquid crystal tunable filter," Chin. Opt. Lett. 7, 667-670 (2009)
http://www.opticsinfobase.org/col/abstract.cfm?URI=col-7-8-667

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