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Della Picca F, Berte R, Rahmani M, Albella P, Bujjamer JM, Poblet M, Cortés E, Maier SA, Bragas AV. Tailored Hypersound Generation in Single Plasmonic Nanoantennas. NANO LETTERS 2016; 16:1428-1434. [PMID: 26814800 DOI: 10.1021/acs.nanolett.5b04991] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Ultrashort laser pulses impinging on a plasmonic nanostructure trigger a highly dynamic scenario in the interplay of electronic relaxation with lattice vibrations, which can be experimentally probed via the generation of coherent phonons. In this Letter, we present studies of hypersound generation in the range of a few to tens of gigahertz on single gold plasmonic nanoantennas, which have additionally been subjected to predesigned mechanical constraints via silica bridges. Using these hybrid gold/silica nanoantennas, we demonstrate experimentally and via numerical simulations how mechanical constraints allow control over their vibrational mode spectrum. Degenerate pump-probe techniques with double modulation are performed in order to detect the small changes produced in the probe transmission by the mechanical oscillations of these single nanoantennas.
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Affiliation(s)
- Fabricio Della Picca
- Laboratorio de Electrónica Cuántica, Departmento de Física, FCEN-IFIBA CONICET, Universidad de Buenos Aires , Intendente Güiraldes 2160, C1428EGA, Buenos Aires, Argentina
| | - Rodrigo Berte
- The Blackett Laboratory, Department of Physics, Imperial College London , London SW7 2AZ, United Kingdom
- CAPES Foundation, Ministry of Education of Brazil , Brasilia, DF 70040-020, Brazil
| | - Mohsen Rahmani
- The Blackett Laboratory, Department of Physics, Imperial College London , London SW7 2AZ, United Kingdom
| | - Pablo Albella
- The Blackett Laboratory, Department of Physics, Imperial College London , London SW7 2AZ, United Kingdom
| | - Juan M Bujjamer
- Laboratorio de Electrónica Cuántica, Departmento de Física, FCEN-IFIBA CONICET, Universidad de Buenos Aires , Intendente Güiraldes 2160, C1428EGA, Buenos Aires, Argentina
| | - Martín Poblet
- Laboratorio de Electrónica Cuántica, Departmento de Física, FCEN-IFIBA CONICET, Universidad de Buenos Aires , Intendente Güiraldes 2160, C1428EGA, Buenos Aires, Argentina
| | - Emiliano Cortés
- The Blackett Laboratory, Department of Physics, Imperial College London , London SW7 2AZ, United Kingdom
| | - Stefan A Maier
- The Blackett Laboratory, Department of Physics, Imperial College London , London SW7 2AZ, United Kingdom
| | - Andrea V Bragas
- Laboratorio de Electrónica Cuántica, Departmento de Física, FCEN-IFIBA CONICET, Universidad de Buenos Aires , Intendente Güiraldes 2160, C1428EGA, Buenos Aires, Argentina
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