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

Applied Sciences

Vladimir M. Fomin¹  Denis L. Nika¹  Evghenii P. Pokatilov¹  Josef T. Devreese²  Jacques Tempere² 

[1] Laboratory of Physics and Engineering of Nanomaterials, Department of Theoretical Physics, Moldova State University, MD-2009 Chisinau, Moldova;TQC, Universiteit Antwerpen, Universiteitsplein 1, 2610 Antwerpen, Belgium;

关键词: plasmons;    absorption;    phonons;    nanoshells;   

DOI  :  10.3390/app9071442

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown