Reshaping the phonon energy landscape of nanocrystals inside a terahertz plasmonic nanocavity

Xin Jin, Andrea Cerea, Gabriele C. Messina, Andrea Rovere, Riccardo Piccoli, Francesco Donato, Francisco Palazon, Andrea Perucchi, Paola Pietro, Roberto Morandotti, Stefano Lupi, Francesco Angelis, Mirko Prato, Andrea Toma () and Luca Razzari ()
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Xin Jin: Matériaux et Télécommunications
Andrea Cerea: Istituto Italiano di Tecnologia
Gabriele C. Messina: Istituto Italiano di Tecnologia
Andrea Rovere: Matériaux et Télécommunications
Riccardo Piccoli: Matériaux et Télécommunications
Francesco Donato: Istituto Italiano di Tecnologia
Francisco Palazon: Istituto Italiano di Tecnologia
Andrea Perucchi: Elettra - Sincrotrone Trieste S.C.p.A
Paola Pietro: Elettra - Sincrotrone Trieste S.C.p.A
Roberto Morandotti: Matériaux et Télécommunications
Stefano Lupi: Università di Roma “La Sapienza”
Francesco Angelis: Istituto Italiano di Tecnologia
Mirko Prato: Istituto Italiano di Tecnologia
Andrea Toma: Istituto Italiano di Tecnologia
Luca Razzari: Matériaux et Télécommunications

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract Phonons (quanta of collective vibrations) are a major source of energy dissipation and drive some of the most relevant properties of materials. In nanotechnology, phonons severely affect light emission and charge transport of nanodevices. While the phonon response is conventionally considered an inherent property of a nanomaterial, here we show that the dipole-active phonon resonance of semiconducting (CdS) nanocrystals can be drastically reshaped inside a terahertz plasmonic nanocavity, via the phonon strong coupling with the cavity vacuum electric field. Such quantum zero-point field can indeed reach extreme values in a plasmonic nanocavity, thanks to a mode volume well below λ3/107. Through Raman measurements, we find that the nanocrystals within a nanocavity exhibit two new “hybridized” phonon peaks, whose spectral separation increases with the number of nanocrystals. Our findings open exciting perspectives for engineering the optical phonon response of functional nanomaterials and for implementing a novel platform for nanoscale quantum optomechanics.

Date: 2018
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DOI: 10.1038/s41467-018-03120-3

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