Temperature tunability of surface plasmon enhanced Smith-Purcell terahertz radiation for semiconductor-based grating.

ABSTRACT: In this work, the terahertz (THz) Smith-Purcell radiations (SPRs) for the relativistic electron bunch passing over an indium antimonide (InSb)-based substrate with a subwavelength grating under various temperatures of substrate are investigated by FDTD simulations and theoretical analyses. The explored SPR is locked and enhanced at a certain emission wavelength with the emission angle still following the wavelength-angle relation of the traditional SPR. This wavelength agrees with the (vacuum) wavelength of surface plasmons (SPs) at the air-InSb interface excited by the electron bunch. The enhancement of SPR at this wavelength is attributed to the energy from electron concentrated in the excited SPs and then transformed into radiation via the SPR mechanism. When the temperature of InSb inc

SUBMITTER: Cheng BH 

PROVIDER: S-EPMC5527105 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature