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

Autor:	Jin X; INRS Énergie, Matériaux et Télécommunications, 1650 Blvd Lionel Boulet, J3X 1S2, Varennes, QC, Canada., Cerea A; Istituto Italiano di Tecnologia, via Morego 30, 16163, Genova, Italy.; Dipartimento di Informatica, Bioingegneria, Robotica e Ingegneria dei Sistemi (DIBRIS), Università degli Studi di Genova, via Balbi 5, 16126, Genova, Italy., Messina GC; Istituto Italiano di Tecnologia, via Morego 30, 16163, Genova, Italy., Rovere A; INRS Énergie, Matériaux et Télécommunications, 1650 Blvd Lionel Boulet, J3X 1S2, Varennes, QC, Canada., Piccoli R; INRS Énergie, Matériaux et Télécommunications, 1650 Blvd Lionel Boulet, J3X 1S2, Varennes, QC, Canada., De Donato F; Istituto Italiano di Tecnologia, via Morego 30, 16163, Genova, Italy., Palazon F; Istituto Italiano di Tecnologia, via Morego 30, 16163, Genova, Italy., Perucchi A; Elettra - Sincrotrone Trieste S.C.p.A, AREA Science Park, S.S. 14 km163.5, Trieste, 34149, Italy., Di Pietro P; Elettra - Sincrotrone Trieste S.C.p.A, AREA Science Park, S.S. 14 km163.5, Trieste, 34149, Italy., Morandotti R; INRS Énergie, Matériaux et Télécommunications, 1650 Blvd Lionel Boulet, J3X 1S2, Varennes, QC, Canada.; National Research University of Information Technologies, Mechanics and Optics, 199034, Saint Petersburg, Russia.; Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610054, China., Lupi S; CNR-IOM and Dipartimento di Fisica, Università di Roma 'La Sapienza', Piazzale A. Moro 2, Roma, I-00185, Italy., De Angelis F; Istituto Italiano di Tecnologia, via Morego 30, 16163, Genova, Italy., Prato M; Istituto Italiano di Tecnologia, via Morego 30, 16163, Genova, Italy., Toma A; Istituto Italiano di Tecnologia, via Morego 30, 16163, Genova, Italy. andrea.toma@iit.it., Razzari L; INRS Énergie, Matériaux et Télécommunications, 1650 Blvd Lionel Boulet, J3X 1S2, Varennes, QC, Canada. razzari@emt.inrs.ca.
Jazyk:	angličtina
Zdroj:	Nature communications [Nat Commun] 2018 Feb 22; Vol. 9 (1), pp. 763. Date of Electronic Publication: 2018 Feb 22.
DOI:	10.1038/s41467-018-03120-3
Abstrakt:	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 λ 3 /10 7 . 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.
Databáze:	MEDLINE
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