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O: Fachverband Oberflächenphysik

O 50: Poster Session - Plasmonics and Nanooptics: Fabrication and Characterization

O 50.2: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/EG

Theoretical analysis on the plasmon-resonant optical response of silver nanoparticles with shapes of sphere, spheroid, and snipped trigonal prism — •Masafuyu Matsui and Hisao Nakamura — AIST, Tsukuba, 305-8568, Japan

Plasmon-resonant optical response of silver nanoparticles with shapes of sphere, spheroid, and snipped trigonal prism are investigated using an analysis method based on dipole--dipole interaction within discrete dipole approximation. In the analysis method, the induced dipole is decomposed into the contributions from incident-light electric field (an incident light term) and that from induced dipole oscillations (a dipole--dipole interaction term) to clarify microscpopic level mechanism of plasmon resonance and near-field effect. The analysis reveals that the diameter corresponding to the polarization direction of the incident light plays a crucial role in determining the optical response of the nanoparticles. In the plasmon resonance along the direction with small diameter, the incident light term is a dominant source of induced dipoles, resulting that the extinction peak appears close to the maximum of imaginary part of polarizability. In contrast, in the plasmon resonance along that with large diameter, the dipole--dipole interaction one is dominant and red-shifts the extinction peak. Therefore, shape control of nanoparticle with high anistropy, for example, nanoplate, is a key factor to exhibit the desired plasmon resonance with sharp peak, leading to development of effective plasmonic devices.