Título:
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A self-stabilized coherent phonon source driven by optical forces
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Autor/a:
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Navarro Urrios, Daniel; Capuj, Nestor Eduardo; Gomis-Bresco, Jordi; Alzina, Francesc; Pitanti, A.; Griol, Amadeu; Martínez, Alejandro; Sotomayor Torres, Clivia M.
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Abstract:
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We report a novel injection scheme that allows for phonon lasing in a one-dimensional opto-mechanical photonic crystal, in a sideband unresolved regime and with cooperativity values as low as 10'2. It extracts energy from a cw infrared laser source and is based on the triggering of a thermo-optical/free-carrier-dispersion self-pulsing limit-cycle, which anharmonically modulates the radiation pressure force. The large amplitude of the coherent mechanical motion acts as a feedback that stabilizes and entrains the self-pulsing oscillations to simple fractions of the mechanical frequency. A manifold of frequency-entrained regions with two different mechanical modes (at 54 and 122MHz) are observed as a result of the wide tuneability of the natural frequency of the self-pulsing. The system operates at ambient conditions of pressure and temperature in a silicon platform, which enables its exploitation in sensing, intra-chip metrology or time-keeping applications. |
Materia(s):
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-Nanophotonics and plasmonics -Photoacoustics |
Derechos:
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open access
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Tipo de documento:
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Article |
Editor:
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Uri:
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https://ddd.uab.cat/record/204890
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