Dual-comb photoacoustic spectroscopy

Jacob T. Friedlein, Esther Baumann, Kimberly A. Briggman, Gabriel M. Colacion, Fabrizio R. Giorgetta, Aaron M. Goldfain, Daniel I. Herman, Eli V. Hoenig, Jeeseong Hwang, Nathan R. Newbury, Edgar F. Perez, Christopher S. Yung, Ian Coddington and Kevin C. Cossel ()
Additional contact information
Jacob T. Friedlein: Applied Physics Division
Esther Baumann: Applied Physics Division
Kimberly A. Briggman: Applied Physics Division
Gabriel M. Colacion: Applied Physics Division
Fabrizio R. Giorgetta: Applied Physics Division
Aaron M. Goldfain: Applied Physics Division
Daniel I. Herman: Applied Physics Division
Eli V. Hoenig: Applied Physics Division
Jeeseong Hwang: Applied Physics Division
Nathan R. Newbury: Applied Physics Division
Edgar F. Perez: Applied Physics Division
Christopher S. Yung: Applied Physics Division
Ian Coddington: Applied Physics Division
Kevin C. Cossel: Applied Physics Division

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Spectrally resolved photoacoustic imaging is promising for label-free imaging in optically scattering materials. However, this technique often requires acquisition of a separate image at each wavelength of interest. This reduces imaging speeds and causes errors if the sample changes in time between images acquired at different wavelengths. We demonstrate a solution to this problem by using dual-comb spectroscopy for photoacoustic measurements. This approach enables a photoacoustic measurement at thousands of wavelengths simultaneously. In this technique, two optical-frequency combs are interfered on a sample and the resulting pressure wave is measured with an ultrasound transducer. This acoustic signal is processed in the frequency-domain to obtain an optical absorption spectrum. For a proof-of-concept demonstration, we measure photoacoustic signals from polymer films. The absorption spectra obtained from these measurements agree with those measured using a spectrophotometer. Improving the signal-to-noise ratio of the dual-comb photoacoustic spectrometer could enable high-speed spectrally resolved photoacoustic imaging.

Date: 2020
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DOI: 10.1038/s41467-020-16917-y

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