title: Evanescent-wave photoacoustic spectroscopy with optical micro/nano fibers.
abstract: We demonstrate gas detection based on evanescent-wave photoacoustic (PA) spectroscopy with tapered optical fibers. Evanescent-field instead of open-path absorption is exploited for PA generation, and a quartz tuning fork is used for PA detection. A tapered optical fiber with a diameter down to the wavelength scale demonstrates detection sensitivity similar to an open-path system but with the advantages of easier optical alignment, smaller insertion loss, and multiplexing capability.
authors.affiliation: Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
authors.forename: Yingchun
authors.initials: Y
authors.lastname: Cao
authors.forename: Wei
authors.initials: W
authors.lastname: Jin
authors.forename: Lut Hoi
authors.initials: LH
authors.lastname: Ho
authors.forename: Zhibo
authors.initials: Z
authors.lastname: Liu