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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 26, Iss. 9 — May. 1, 2001
  • pp: 584–586

Narrow-linewidth bandpass filters with diffractive thin-film layers

S. Tibuleac and R. Magnusson  »View Author Affiliations


Optics Letters, Vol. 26, Issue 9, pp. 584-586 (2001)
http://dx.doi.org/10.1364/OL.26.000584


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Abstract

Bandpass filters based on guided-mode resonance effects in waveguide-grating structures are obtained by use of a genetic algorithm search-and-optimization routine. Calculated examples show that narrow linewidths, high peaks, and low sideband transmittances can be achieved in thin-film diffractive devices with few layers. A filter with a linewidth of 0.2 nm at a central wavelength of 0.55 µm is demonstrated in a two-layer–two-grating structure. At 10.6-µm wavelength, a filter consisting of a single binary grating is obtained that has a linewidth of 12.7 nm and extended, low sideband transmittance. A three-layer device with a surface relief Si grating and two underlying homogeneous layers of SiO2 and Si yields a high-efficiency filter centered at 1.55 µm with a linewidth of 0.1 nm.

© 2001 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1970) Diffraction and gratings : Diffractive optics
(310.0310) Thin films : Thin films
(310.2790) Thin films : Guided waves

Citation
S. Tibuleac and R. Magnusson, "Narrow-linewidth bandpass filters with diffractive thin-film layers," Opt. Lett. 26, 584-586 (2001)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-26-9-584

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