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Investigating mechanisms of laser pulse-induced reflectivity modulations in photoacoustic remote sensing with a 10 million frames-per-second camera.
Haven, Nathaniel J M; Martell, Matthew T; Li, Haoyang; Hogan, James D; Zemp, Roger J.
Afiliación
  • Haven NJM; Electrical and Computer Engineering Department, University of Alberta, Edmonton, T6G 2R3, Canada.
  • Martell MT; Electrical and Computer Engineering Department, University of Alberta, Edmonton, T6G 2R3, Canada.
  • Li H; Mechanical Engineering Department, University of Alberta, Edmonton, T6G 2R3, Canada.
  • Hogan JD; Mechanical Engineering Department, University of Alberta, Edmonton, T6G 2R3, Canada.
  • Zemp RJ; Electrical and Computer Engineering Department, University of Alberta, Edmonton, T6G 2R3, Canada. rzemp@ualberta.ca.
Sci Rep ; 13(1): 3751, 2023 Mar 07.
Article en En | MEDLINE | ID: mdl-36882492
Photoacoustic remote sensing has been recently developed as an all-optical imaging modality capable of imaging a variety of endogenous contrast agents label-free. Initially predicted laser pulse-induced refractive index perturbation-based interrogation beam reflectivity modulations have been found to be orders of magnitude smaller than those typically observed experimentally. In this report we utilize a 10 million frames-per-second camera to further investigate these predicted reflectivity modulations, while also exploring other potential mechanisms of laser pulse-induced reflectivity modulations. Laser-induced motion is demonstrated both laterally for gold wires suspended and submerged in air and water, respectively, and carbon fibers submerged in water, and axial motion is observed in gold wires submerged in a depth gradient of intralipid solution. This laser-induced sample motion is anticipated to cause reflectivity modulations local to the interrogation beam profile in microscopy set-ups. Non-motion-based maximum intensity modulations of 3% are also observed in gold wires submerged in water, indicating the presence of the originally predicted reflectivity modulations. Overall, these observations are important as they provide a widefield view of laser-pulse interactions unavailable in previous point scanning-based photoacoustic remote sensing microscopy configurations, where observed mechanisms occur on time-scales orders of magnitude faster than equivalent field of view point scanning capabilities.

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2023 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Reino Unido

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2023 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Reino Unido