Manipulation of Transient Optical Properties ofGold Square Nanopore Arrays Based on Polarization
To elucidate the modulation mechanism of the polarization direction of pump light on the tran-sient optical properties of metal nanostructures in all-optical regulation,a study was conducted using a gold square nanopore array as the subject.Through electromagnetic-thermal coupling simulations,the transient opti-cal response of plasmon modes under two different polarization conditions was investigated.The results revealed that when the polarization direction of the pump light aligned with that of the probe light,the plasmon mode exhibited a stronger and faster transient optical response compared to the misaligned scenario.Addition-ally,significant differences were observed in the transient optical responses induced by various plasmon modes.This study offers a novel approach for ultrafast optical field modulation and enhances our understanding of the ultrafast nonlinear optical effects associated with surface plasmon resonance from a mechanistic perspective.
surface plasmonultrafast dynamicsoptical field modulationultrafast spectroscopy
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