Coherent excitation of torsional mechanical modes in acoustoplasmonic antennas

Antonio García-Martin; J. M. García; Chushuang Xiang; N. D. Lanzillotti-Kimura

doi:10.1117/12.3022159

11 June 2024 Coherent excitation of torsional mechanical modes in acoustoplasmonic antennas

Antonio García-Martin, J. M. García, Chushuang Xiang, N. D. Lanzillotti-Kimura

Proceedings Volume PC12991, Nanophotonics X; PC129910G (2024) https://doi.org/10.1117/12.3022159
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Metallic nanoantennas have been studied as efficient coherent phonon generators and detectors, harnessing their characteristic optical absorption and polarization dependence of the optical modes. The ability to control the excitation of phononic modes depends on the properties of the multiple optical resonances of the system. Lately, it has been made possible to optimally excite and detect phonon modes via plasmon resonances at the same optical frequency using chiral nanostructures and circularly polarized light. However, torsional modes remain elusive in nanophononic studies. In this work we present a simple system composed of two coupled bars, where torsional mechanical modes can be excited using light with null angular momentum. The twisting of the phononic mode is provided by the peculiar symmetry of the mechanical eigenmode due to the interaction of the bars via either the substrate or a central connector. We will present a complete theoretical analysis of the phononic and plasmonic modes, their surface deformation field and electromagnetic field profiles.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Antonio García-Martin, J. M. García, Chushuang Xiang, and N. D. Lanzillotti-Kimura "Coherent excitation of torsional mechanical modes in acoustoplasmonic antennas", Proc. SPIE PC12991, Nanophotonics X, PC129910G (11 June 2024); https://doi.org/10.1117/12.3022159

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