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Plasmon–Phonon Interactions in Topological Insulator Microrings
Author(s) -
Autore Marta,
D'Apuzzo Fausto,
Di Gaspare Alessandra,
Giliberti Valeria,
Limaj Odeta,
Roy Pascale,
Brahlek Matthew,
Koirala Nikesh,
Oh Seongshik,
García de Abajo Francisco Javier,
Lupi Stefano
Publication year - 2015
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201400513
Subject(s) - plasmon , graphene , topological insulator , terahertz radiation , materials science , phonon , optoelectronics , condensed matter physics , photonics , dirac (video compression format) , nanotechnology , physics , quantum mechanics , neutrino
The great potential of Dirac electrons for plasmonics and photonics has been readily recognized after their discovery in graphene, followed by applications to smart optical devices. Dirac carriers are also found in topological insulators (TIs)—quantum systems having an insulating gap in the bulk and intrinsic Dirac metallic states at the surface. Here, the plasmonic response of ring structures patterned in Bi 2 Se 3 TI films is investigated through terahertz (THz) spectroscopy. The rings are observed to exhibit a bonding and an antibonding plasmon modes, which we tune in frequency by varying their diameter. An analytical theory based on the THz conductance of unpatterned films is developed, which accurately describes the strong plasmon–phonon hybridization and Fano interference experimentally observed as the bonding plasmon is swiped across the prominent 2 THz phonon exhibited by this material. This work opens the road for the investigation of plasmons in topological insulators and for their application in tunable THz devices.