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Resolution enhancement in nonlinear photoacoustic imaging

Nonlinear processes can be exploited to gain access to more information than is possible in the linear regime. Nonlinearity modifies the spectra of the excitation signals through harmonic generation, frequency mixing, and spectral shifting, so that features originally outside the detector range can... Full description

Journal Title: Applied Physics Letters 23 November 2015, Vol.107(21)
Main Author: Goy, Alexandre S
Other Authors: Fleischer, Jason W
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0003-6951 ; E-ISSN: 1077-3118 ; DOI: 10.1063/1.4935202
Link: https://www.osti.gov/biblio/22486111
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recordid: osti_s22486111
title: Resolution enhancement in nonlinear photoacoustic imaging
format: Article
creator:
  • Goy, Alexandre S
  • Fleischer, Jason W
subjects:
  • Classical And Quantum Mechanics, General Physics
  • Absorption
  • Excitation
  • Gain
  • Harmonic Generation
  • Images
  • Metals
  • Noise
  • Nonlinear Problems
  • Signals
  • Spatial Resolution
  • Spectral Shift
  • Engineering
  • Physics
ispartof: Applied Physics Letters, 23 November 2015, Vol.107(21)
description: Nonlinear processes can be exploited to gain access to more information than is possible in the linear regime. Nonlinearity modifies the spectra of the excitation signals through harmonic generation, frequency mixing, and spectral shifting, so that features originally outside the detector range can be detected. Here, we present an experimental study of resolution enhancement for photoacoustic imaging of thin metal layers immersed in water. In this case, there is a threshold in the excitation below which no acoustic signal is detected. Above threshold, the nonlinearity reduces the width of the active area of the excitation beam, resulting in a narrower absorption region and thus improved spatial resolution. This gain is limited only by noise, as the active area of the excitation can be arbitrarily reduced when the fluence becomes closer to the threshold. Here, we demonstrate a two-fold improvement in resolution and quantify the image quality as the excitation fluence goes through threshold.
language: eng
source:
identifier: ISSN: 0003-6951 ; E-ISSN: 1077-3118 ; DOI: 10.1063/1.4935202
fulltext: fulltext
issn:
  • 0003-6951
  • 00036951
  • 1077-3118
  • 10773118
url: Link


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subjectClassical And Quantum Mechanics, General Physics ; Absorption ; Excitation ; Gain ; Harmonic Generation ; Images ; Metals ; Noise ; Nonlinear Problems ; Signals ; Spatial Resolution ; Spectral Shift ; Engineering ; Physics
descriptionNonlinear processes can be exploited to gain access to more information than is possible in the linear regime. Nonlinearity modifies the spectra of the excitation signals through harmonic generation, frequency mixing, and spectral shifting, so that features originally outside the detector range can be detected. Here, we present an experimental study of resolution enhancement for photoacoustic imaging of thin metal layers immersed in water. In this case, there is a threshold in the excitation below which no acoustic signal is detected. Above threshold, the nonlinearity reduces the width of the active area of the excitation beam, resulting in a narrower absorption region and thus improved spatial resolution. This gain is limited only by noise, as the active area of the excitation can be arbitrarily reduced when the fluence becomes closer to the threshold. Here, we demonstrate a two-fold improvement in resolution and quantify the image quality as the excitation fluence goes through threshold.
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Nonlinear processes can be exploited to gain access to more information than is possible in the linear regime. Nonlinearity modifies the spectra of the excitation signals through harmonic generation, frequency mixing, and spectral shifting, so that features originally outside the detector range can be detected. Here, we present an experimental study of resolution enhancement for photoacoustic imaging of thin metal layers immersed in water. In this case, there is a threshold in the excitation below which no acoustic signal is detected. Above threshold, the nonlinearity reduces the width of the active area of the excitation beam, resulting in a narrower absorption region and thus improved spatial resolution. This gain is limited only by noise, as the active area of the excitation can be arbitrarily reduced when the fluence becomes closer to the threshold. Here, we demonstrate a two-fold improvement in resolution and quantify the image quality as the excitation fluence goes through threshold.

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