Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 221, Issue -, Pages 1094-1103Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.07.061
Keywords
Photonic crystal waveguides; Mid-Infrared waveguides; Silicon photonics; Chemical sensor
Funding
- NSF (SBIR) [IIP-1127251]
- Army SBIR [W911SR-12-C-0046]
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We provide the first experimental demonstration of the transmission characteristics of holey and slotted photonic crystal waveguides (PCWs) in silicon-on-sapphire at mid-infrared wavelength of 3.43 mu m. Devices are studied as a function of lattice constant to tune the photonic stop band across the single wavelength of the source laser. In the holey PCW, propagation losses less than 20 dB/cm are observed below the light line while more than 400 dB/cm propagation losses are observed above the light line, characteristic of the waveguiding behavior of photonic crystal line defect modes. Comparison between the holey and slotted PCWs with PCWs without low-index inclusions shows the higher sensitivity to refractive index changes in chemical sensing for the holey and slotted PCWs compared to the regular PCWs. Triethylphosphate (TEP), a chemical warfare simulant, was detected down to a concentration of 10 ppm (parts per million) with a 800 mu m long holey PCW in gas phase via optical absorbance signature. (C) 2015 Elsevier B.V. All rights reserved.
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