Journal
ACS PHOTONICS
Volume 8, Issue 10, Pages 2846-2852Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.1c00741
Keywords
plasmonics; nanoantenna; surface acoustic wave; hypersound; nanophononics
Categories
Funding
- PICT [2017-2534]
- UBACyT [20020170100432BA]
- Deutsche Forschungsgemeinschaft (Germany's Excellence Strategy) [EXC 2089/1-390776260]
- European Commission [ERC-802989]
- EPSRC Reactive Plasmonics Programme [EP/M013812/1]
- Lee Lucas Chair in Physics
- Brazilian National Council for Scientific and Technological Development (CNPq) [PDJ 2019 150393/2020-2]
- European Union's Horizon 2020 Framework Programme for Research and Innovation (2014-2020) under Marie Sklodowska-Curie Grant [754388]
- LMUexcellent, LMU Munich
- PIP [112 201301 00619]
- EPSRC [EP/M013812/1] Funding Source: UKRI
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Hypersound waves can efficiently mediate optical signals at the nanoscale, with the ability to be controlled and focused in a small region of space. This study demonstrates the coupling of two optical nanoantennas through an acoustic wave, investigating the generation and detection processes, and proposing new designs to enhance the directionality of the hypersonic surface acoustic wave.
Hypersound waves can be efficient mediators between optical signals at the nanoscale. Having phase velocities several orders of magnitude lower than the speed of light, they propagate with much shorter wavelengths and can be controlled, directed, and even focused in a very small region of space. This work shows how two optical nanoantennas can be coupled through an acoustic wave that propagates with a certain directionality. An emitter antenna is first optically excited to generate acoustic coherent phonons that launch surface acoustic waves through the underlying substrate. These waves travel until they are mechanically detected by a receiver nanoantenna whose oscillation produces a detectable optical signal. Generation and detection are studied in detail, and new designs are proposed to improve the directionality of the hypersonic surface acoustic wave.
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