Resonant Terahertz Light Absorption by Virtue of Tunable Hybrid Interface Phonon–Plasmon Modes in Semiconductor Nanoshells

Abstract

Metallic nanoshells have proven to be particularly versatile, with applications in biomedical imaging and surface-enhanced Raman spectroscopy. Here, we theoretically demonstrate that hybrid phonon-plasmon modes in semiconductor nanoshells offer similar advantages in the terahertz regime. We show that, depending on tm,n,nhe doping of the semiconductor shells, terahertz light absorption in these nanostructures can be resonantly enhanced due to the strong coupling between interface plasmons and phonons. A threefold to fourfold increase in the absorption peak intensity was achieved at specific values of electron concentration. Doping, as well as adapting the nanoshell radius, allowed for fine-tuning of the absorption peak frequencies.

Halloysite Nanotubes with Immobilized Plasmonic Nanoparticles for Biophotonic Applications

“…Plasmonic fields from NPs deposited on HNTs are well-observed with different photonic methods. For example, HNTs:Ag-NPs with added small amounts of probe molecules showed a remarkable SERS activity of Ag-NPs even after one week of sto in water, which indicates the improved stability of Ag-NPs on the HNTs' surfaces The spatial distribution of Ag-NPs on the surface of HNTs forms numerous "hot sp between NPs that leads to an increase in the SERS efficiency [11][12][13][14][15][16][17][18][19].…”

“…Moreover, plasmonic NPs, which are fixed on HNTs, are protected from sticking together, they form agglomerates less often, and retain their properties longer [11]. Note that the physical properties of nanostructures depend on their topology-driven interface conditions, and an example of the terahertz light absorption in semiconductor nanoshells resonantly enhanced due to the strong coupling between interface plasmons and phonons is demonstrated [13].…”

Phonons and Thermal Transport in Si/SiO2 Multishell Nanotubes: Atomistic Study

“…Thermal properties of nanostructures and different methods of their optimization have been widely investigated both experimentally and theoretically [3][4][5][6][7][8]. Phonon engineering, i.e., targeted modification of phonon modes in nanostructures to enhance their thermal [5,9,10], electrical [9] and optical properties [11,12], manifests itself as a powerful tool for the optimization of nanoscale thermal transport [5,9,10]. Nanomaterials with high thermal conductivity (TC), such as graphene, are promising candidates as heat spreaders and interconnectors [13][14][15][16], while nanomaterials with low thermal conductivity and high electrical conductivity can be used for thermoelectric applications.…”