Open AccessSubstrate carrier concentration dependent plasmon-phonon coupled modes at the interface between graphene and semiconductors
Author(s) -
Lei Wang,
Wei Cai,
Linyu Niu,
Wenqi Luo,
Zenghong Ma,
Chenglin Du,
Shuqing Xue,
Xinzheng Zhang,
Jingyi Xu
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.029533
Subject(s) - graphene , plasmon , substrate (aquarium) , phonon , surface plasmon , materials science , semiconductor , optoelectronics , surface phonon , condensed matter physics , dispersion (optics) , optics , nanotechnology , physics , oceanography , geology
The coupled modes between graphene plasmons and surface phonons of a semiconductor substrate are investigated, which can be efficiently controlled by carrier injection of the substrate. A new physical mechanism on tuning plasmon-phonon coupled modes (PPCMs) is proposed due to the fact that the energy and lifetime of substrate surface phonons depend a lot on the carrier concentration. Specifically, the change of dispersion and lifetime of PPCMs can be controlled by the carrier concentration of the substrate. The energy of PPCMs for a given momentum increases as the carrier concentration of the substrate increases. On the other hand, the momentum of PPCMs for a given energy decreases when the carrier concentration of the substrate increases. The lifetime of PPCMs is always larger than the intrinsic lifetime of graphene plasmons without plasmon-phonon coupling.