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Optical Engineering

Periodic photonic filters: theory and experiment
Author(s): Guoliang Chen; Kyu Jin Lee; Robert Magnusson
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Paper Abstract

Photonic multiline filters exhibiting periodic resonance lines on a dense spectral grid in a broad wavelength range are demonstrated. We design the filters using rigorous numerical methods and then proceed with experimental verification by patterning, etching, and collecting spectral data. We use standard double-side-polished 300-μm-thick silicon wafers for the experiments. On one side of the wafer, we place a shallow grating whereas the other side has a quarter-wave antireflection layer. An example filter with a ∼200-nm-deep TiO2 grating on the wafer yields 12 narrow resonance peaks within a 10-nm wavelength range centered at 1550 nm. The spectral width of each filter peak is ∼0.1  nm with a free spectral range of ∼0.8  nm. Peak efficiency approaches 80% with low sidebands between the resonant filter lines. We discuss briefly design of polarization-independent periodic filters and the concept of Brewster-angle filters. Possible applications include spectral sampling and wavelength discretization as used, e.g., in sensing gas species and quantifying toxic gas concentrations.

Paper Details

Date Published: 18 March 2016
PDF: 6 pages
Opt. Eng. 55(3) 037108 doi: 10.1117/1.OE.55.3.037108
Published in: Optical Engineering Volume 55, Issue 3
Show Author Affiliations
Guoliang Chen, The Univ. of Texas at Arlington (United States)
Kyu Jin Lee, The Univ. of Texas at Arlington (United States)
Robert Magnusson, The Univ. of Texas at Arlington (United States)

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