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Wavelength-dependent nonlinear absorption and ultrafast dynamics process of Au triangular nanoprisms
Optics Express
|June 30, 2019
Summary
Gold triangular nanoprisms show intensity-dependent nonlinear absorption, switching from saturation absorption to reverse saturation absorption. Ultrafast dynamics reveal double-exponential energy relaxation, modulated by vibrational modes.
Area of Science:
- Nanophotonics
- Materials Science
- Ultrafast Spectroscopy
Background:
- Gold triangular nanoprisms are plasmonic nanomaterials with unique optical properties.
- Understanding their nonlinear optical behavior is crucial for applications in photonics and optoelectronics.
Purpose of the Study:
- To investigate the nonlinear absorption and ultrafast dynamics of gold triangular nanoprisms.
- To elucidate the intensity-dependent optical switching and energy relaxation mechanisms.
Main Methods:
- Broadband nanosecond Z-scan measurements (550–700 nm).
- Femtosecond time-resolved transient absorption spectroscopy.
Main Results:
- Gold triangular nanoprisms exhibit saturation absorption (SA) at low intensities.
- A switch from SA to reverse saturation absorption (RSA) was observed with increasing incident intensity.
- Ultrafast dynamics showed a double-exponential energy relaxation process (fast and slow components).
- Relaxation decay exhibited modulation due to vibrational modes when the probe wavelength was off-resonance.
Conclusions:
- Gold triangular nanoprisms display complex nonlinear optical responses.
- The observed intensity-dependent switching and ultrafast dynamics provide insights into energy dissipation pathways.
- Coherent excitation and vibrational modes play a role in the photo-dynamics of these plasmonic nanostructures.
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