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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 37, Iss. 18 — Sep. 15, 2012
  • pp: 3792–3794

Spectrally dense comb-like filters fashioned with thick guided-mode resonant gratings

Robert Magnusson  »View Author Affiliations


Optics Letters, Vol. 37, Issue 18, pp. 3792-3794 (2012)
http://dx.doi.org/10.1364/OL.37.003792


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Abstract

We present the spectral properties of multiline guided-mode resonance filters designed with extremely thick dielectric films. We treat a dielectric membrane in air with a subwavelength grating inscribed into one surface. As the film is very thick on the scale of the wavelength, it supports a large number of resonant modes. In general, the resonant modes yield a dense reflectance spectrum with irregular appearance. We show that by placing an antireflection layer on the backside of the slab, the interference between the directly transmitted zero order and the diffracted order generating the waveguide modes is eliminated. Thus, a well-shaped, unperturbed comb-like spectrum is realized. A titanium dioxide membrane that is 500 μm thick generates a spectrum with more than 1000 channels separated by 0.8nm near the 1.55 μm wavelength.

© 2012 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(230.5750) Optical devices : Resonators
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

History
Original Manuscript: June 13, 2012
Manuscript Accepted: July 26, 2012
Published: September 6, 2012

Citation
Robert Magnusson, "Spectrally dense comb-like filters fashioned with thick guided-mode resonant gratings," Opt. Lett. 37, 3792-3794 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-18-3792

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