Details
| Original language | English |
|---|---|
| Article number | 043151 |
| Number of pages | 14 |
| Journal | Physical Review Research |
| Volume | 5 |
| Issue number | 4 |
| Publication status | Published - 14 Nov 2023 |
Abstract
The optical properties of metallic nanoparticles are most often considered in terms of plasmons, the coupled states of light and quasifree electrons. Confinement of electrons inside the nanostructure leads to another, very different type of resonances. We demonstrate that these confinement-induced resonances typically join into a single composite "super-resonance,"located at significantly lower frequencies than the plasmonic resonance. This super-resonance influences the optical properties in the low-frequency range, in particular, producing giant nonlinearities. We show that such nonlinearities can be used for efficient down-conversion from optical to terahertz and midinfrared frequencies on the submicrometer propagation distances in nanocomposites. We discuss the interaction of the quantum-confinement-induced super-resonance with the conventional plasmonic ones, as well as the unusual quantum level statistics, adapting here the paradigms of the quantum billiard theory and showing the possibility to control the resonance position and width using the geometry of the nanostructures.
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In: Physical Review Research, Vol. 5, No. 4, 043151, 14.11.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Metallic nanostructures as electronic billiards for nonlinear terahertz photonics
AU - Babushkin, Ihar
AU - Shi, Liping
AU - Demircan, Ayhan
AU - Morgner, Uwe
AU - Herrmann, Joachim
AU - Husakou, Anton
N1 - Funding Information: I.B., A.D., and U.M. acknowledge support from the Deutsche Forschungsgemeinschaft under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project No. 390833453). A.H. acknowledges support from European Union Project No. H2020-MSCA-RISE-2018-823897 “Atlantic.”
PY - 2023/11/14
Y1 - 2023/11/14
N2 - The optical properties of metallic nanoparticles are most often considered in terms of plasmons, the coupled states of light and quasifree electrons. Confinement of electrons inside the nanostructure leads to another, very different type of resonances. We demonstrate that these confinement-induced resonances typically join into a single composite "super-resonance,"located at significantly lower frequencies than the plasmonic resonance. This super-resonance influences the optical properties in the low-frequency range, in particular, producing giant nonlinearities. We show that such nonlinearities can be used for efficient down-conversion from optical to terahertz and midinfrared frequencies on the submicrometer propagation distances in nanocomposites. We discuss the interaction of the quantum-confinement-induced super-resonance with the conventional plasmonic ones, as well as the unusual quantum level statistics, adapting here the paradigms of the quantum billiard theory and showing the possibility to control the resonance position and width using the geometry of the nanostructures.
AB - The optical properties of metallic nanoparticles are most often considered in terms of plasmons, the coupled states of light and quasifree electrons. Confinement of electrons inside the nanostructure leads to another, very different type of resonances. We demonstrate that these confinement-induced resonances typically join into a single composite "super-resonance,"located at significantly lower frequencies than the plasmonic resonance. This super-resonance influences the optical properties in the low-frequency range, in particular, producing giant nonlinearities. We show that such nonlinearities can be used for efficient down-conversion from optical to terahertz and midinfrared frequencies on the submicrometer propagation distances in nanocomposites. We discuss the interaction of the quantum-confinement-induced super-resonance with the conventional plasmonic ones, as well as the unusual quantum level statistics, adapting here the paradigms of the quantum billiard theory and showing the possibility to control the resonance position and width using the geometry of the nanostructures.
UR - http://www.scopus.com/inward/record.url?scp=85178050949&partnerID=8YFLogxK
U2 - 10.48550/arXiv.2104.14637
DO - 10.48550/arXiv.2104.14637
M3 - Article
AN - SCOPUS:85178050949
VL - 5
JO - Physical Review Research
JF - Physical Review Research
SN - 2643-1564
IS - 4
M1 - 043151
ER -