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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 1 — Jan. 14, 2013
  • pp: 1301–1309

Highly angle tolerant filter incorporating serially cascaded a-Si based etalons and its application to a compact receiver

Tae-Hui Noh, Yeo-Taek Yoon, Hong-Shik Lee, Sang-Shin Lee, and Duk-Yong Choi  »View Author Affiliations

Optics Express, Vol. 21, Issue 1, pp. 1301-1309 (2013)

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A highly angle tolerant spectral filter has been implemented taking advantage of three-stage serially concatenated resonators in dielectric films, each of which involves a high-index cavity in a-Si, sandwiched with a pair of SiO2 films. For the constituent etalons, the free spectral range is individually adjusted by differentiating the thickness of the cavity, so that a primary infrared pass-band could be attained to present enhanced roll-off characteristics in conjunction with an appropriate bandwidth. The a-Si cavities relating to the three etalons are selected to be 117, 234, and 468-nm thick, while the SiO2 layer is uniformly 150-nm thick. The filter is actually created on a silica glass substrate, by alternately depositing SiO2 and a-Si films. The observed center wavelength, bandwidth, and peak transmission efficiency are about 900 nm, 120 nm, and over 90%, respectively, for normal incidence. In response to an angle change amounting to 60°, the relative wavelength shift and the variation in peak transmission become barely 0.03 and 8%, respectively. Finally, a detecting cell is constructed by integrating the prepared filter with a photodiode, thus rendering a 3-dB angular bandwidth of 90°. By adequately arranging three detecting cells in a fixture, a compact, portable optical receiver could then be constructed. For incoming collimated light at λ = 905 nm, the infrared receiver exhibits an extended 3-dB angular acceptance as large as 160°.

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OCIS Codes
(040.3060) Detectors : Infrared
(230.0040) Optical devices : Detectors
(230.5750) Optical devices : Resonators
(310.6628) Thin films : Subwavelength structures, nanostructures
(310.6845) Thin films : Thin film devices and applications
(230.7408) Optical devices : Wavelength filtering devices

ToC Category:

Original Manuscript: November 7, 2012
Revised Manuscript: December 24, 2012
Manuscript Accepted: January 2, 2013
Published: January 11, 2013

Tae-Hui Noh, Yeo-Taek Yoon, Hong-Shik Lee, Sang-Shin Lee, and Duk-Yong Choi, "Highly angle tolerant filter incorporating serially cascaded a-Si based etalons and its application to a compact receiver," Opt. Express 21, 1301-1309 (2013)

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