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Surface-plasmon-enhanced strain-wave-induced optical diffraction changes from a segmented grating.

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  • 1Advanced Research Center for Nanolithography (ARCNL), Science Park 106, 1098 XG Amsterdam, The Netherlands.

Photoacoustics
|May 22, 2023
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Summary
This summary is machine-generated.

Surface-plasmon-polariton-enhanced grating enhances strain-wave detection. This study shows significant reflection and diffraction changes from surface acoustic waves and longitudinal waves due to SPP resonances.

Keywords:
DiffractionNanostructuresPhotoacousticsSegmented gratingSurface plasmon polaritonsUltrafast

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Acoustics

Background:

  • Surface plasmon polaritons (SPPs) enable enhanced light-matter interactions.
  • Grating structures are crucial for controlling and exciting SPPs.
  • Strain waves can modulate optical properties of materials.

Purpose of the Study:

  • To investigate SPP-enhanced reflection and diffraction changes induced by strain waves.
  • To analyze the impact of SPP resonances on strain wave detection.
  • To quantify the enhancement factors for reflection and diffraction.

Main Methods:

  • Fabrication of a gold-covered segmented grating with specific periods.
  • Excitation of SPPs at three distinct optical wavelengths.
  • Probing strain waves (SAWs and LWs) using a tunable probe pulse.
  • Measurement of reflection and diffraction changes at resonance and off-resonance wavelengths.

Main Results:

  • Identification of Surface Acoustic Waves (SAWs) and Longitudinal Waves (LWs).
  • Strong enhancement of reflection changes by factors of 23 (SAWs) and 36 (LWs) near SPP resonances.
  • Further enhancement of relative diffraction changes by factors up to 3.3 (SAWs) and 2.6 (LWs) compared to reflection changes.

Conclusions:

  • Segmented gratings effectively excite SPPs for enhanced strain wave sensing.
  • SPP resonances significantly amplify the optical response to strain waves.
  • This approach offers a promising method for sensitive detection of acoustic waves.