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Optics Letters

Optics Letters


  • Vol. 29, Iss. 21 — Nov. 1, 2004
  • pp: 2545–2547

Gradient-index narrow-bandpass filter fabricated with glancing-angle deposition

Andy C. van Popta, Matthew M. Hawkeye, Jeremy C. Sit, and Michael J. Brett  »View Author Affiliations

Optics Letters, Vol. 29, Issue 21, pp. 2545-2547 (2004)

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Glancing-angle deposition (GLAD) is a fabrication method capable of producing thin films with engineered nanoscale porosity variations. GLAD can be used to create optical thin-film interference filters from a single source material by modification of the film refractive index through control of film porosity. We present the effects of introducing a layer of constant low density into the center of a rugate thin-film filter fabricated with the GLAD technique. A rugate filter is characterized by a sinusoidal refractive-index profile. Embedding a layer of constant refractive index, with a thickness equal to one period of the rugate index variation, causes a narrow bandpass to appear within the filter's larger stop band. Transmittance measurements of such a gradient-index narrow-bandpass filter, formed with titanium dioxide, revealed an 83% transmittance peak at a vacuum wavelength of 522 nm, near the center of the stop band, with a FWHM bandwidth of 15 nm.

© 2004 Optical Society of America

OCIS Codes
(160.4670) Materials : Optical materials
(310.0310) Thin films : Thin films
(310.6860) Thin films : Thin films, optical properties
(350.2460) Other areas of optics : Filters, interference

Andy C. van Popta, Matthew M. Hawkeye, Jeremy C. Sit, and Michael J. Brett, "Gradient-index narrow-bandpass filter fabricated with glancing-angle deposition," Opt. Lett. 29, 2545-2547 (2004)

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