Random Multiple Scattering Enhanced Photoacoustic Gas Spectroscopy with Disordered Porous Ceramics

Haihong Bao; Congzhe Zhang; Yinping Miao; Wei Jin

doi:10.1021/acsami.8b06729

Random Multiple Scattering Enhanced Photoacoustic Gas Spectroscopy with Disordered Porous Ceramics

ACS Appl Mater Interfaces. 2018 Aug 8;10(31):26372-26377. doi: 10.1021/acsami.8b06729. Epub 2018 Jul 27.

Authors

Haihong Bao^{1

2}, Congzhe Zhang^{1

2}, Yinping Miao^{1

2}, Wei Jin^{1

2}

Affiliations

¹ Department of Electrical Engineering , The Hong Kong Polytechnic University , Hung Hom, Kowloon , Hong Kong , China.
² Photonic Sensors Research Center , The Hong Kong Polytechnic University Shenzhen Research Institute , Shenzhen 518057 , China.

PMID: 30011177
DOI: 10.1021/acsami.8b06729

Abstract

Light-gas interaction can be enhanced by using disordered porous materials because multiple random scattering increases light intensity near the surface of the material. Here we report signal enhancement of photoacoustic gas spectroscopy with disordered porous ceramics. The amplitude and frequency characteristics of photoacoustic signal due to gas absorption in disordered materials are modeled theoretically. Experiment with a porous Al₂O₃ sample demonstrates photoacoustic signal enhancement of ∼4 times at 5 kHz.

Keywords: gas spectroscopy; light localization; optical fiber sensor; photoacoustic signal enhancement; porous material; random multiple scattering.