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Towards on-chip mid infrared photonic aerosol spectroscopy
Name
1806.06910.pdf
Description
Accepted version
Size
656.89 KB
Format
Adobe PDF
Checksum (MD5)
2a3245d7d2a84335629b231277908308
Author(s)
Singh, Robin
Su, Peter
Kimerling, Lionel
Agarwal, Anu
Anthony, Brian W
Date Issued
2018
Journal
Applied Physics Letters
Publisher
AIP Publishing
Version
Author's final manuscript
Abstract
© 2018 Author(s). We propose an on-chip mid-infrared (MIR) photonic spectroscopy platform for aerosol characterization to obtain highly discriminatory information on the chemistry of aerosol particles. Sensing of aerosols is crucial for various environmental, climatic, warfare threat detection, and pulmonary healthcare applications. Currently, chemical characterization of aerosols is performed using FTIR spectroscopy, yielding chemical fingerprinting because most of the vibrational and rotational transitions of chemical molecules fall in the IR range, and Raman spectroscopy. Both techniques use free space bench-top geometries. Here, we propose miniaturized on-chip MIR photonics-based aerosol spectroscopy consisting of a broadband spiral-waveguide sensor that significantly enhances the particle-light interaction to improve sensitivity. The spiral waveguides are made of a chalcogenide glass material (Ge23Sb7S70) which shows a broad transparency over the IR range (1-10 μm). We demonstrate the sensing of N-methyl aniline-based aerosol particles with the device. We anticipate that the sensor will readily complement existing photonic resonator-based particle sizing and counting techniques to develop a unified framework for on-chip integrated photonic aerosol spectroscopy.
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
10.1063/1.5058694
