Presentation Information
[9p-PB7-4]Stronger Near-Field Light Generated by Detuned Plasmonic Nanorods
〇(D)Lin Cui1, Aandrea Schirato2,3, Remo Proietti Zaccaria4, Prabhat Verma1, Takayuki Umakoshi1 (1.Univ. of Osaka, 2.Poli. Milano, 3.Rice Univ., 4.IIT Italy)
Keywords:
plasmonics,near-field light
Plasmonic nanostructures that exhibit strong near-field light have played a central role in plasmonics and nanophotonics. To generate strong near-field light, the incident light wavelength is matched to the plasmon resonance wavelength of nanostructures. In addition, we can increase the incident light intensity to further increase the near-field light intensity. However, under high-intensity excitation, absorbed optical energy induces photothermal heating and the resulting temperature increase, leading to a redshift of the plasmon resonance wavelength due to changes in the permittivity of the plasmonic material. This implies that detuned plasmonic nanostructures, whose plasmon resonance wavelength is slightly shorter than the incident wavelength, can generate stronger near-field light under high-intensity excitation. In this study, using a gold nanorod as a model system, we quantitively evaluated how photothermal heating changes the nanorod’s optical property and investigated the optimal nanorod length for generating stronger near-field light under high-intensity excitation.