TMDC-based topological nanospaser: single and double threshold behavior
Abstract
We theoretically study a topological nanospaser, which consists of a silver nanospheroid and MoS monolayer ake of a circular shape. The metal nanospheroid acts as a plasmonic nanoresonator that supports two rotating modes, which are coupled to the corresponding valleys of MoS. We apply external circularly polarized light that selectively pumps only one of the valleys of MoS. The generated spaser dynamics strongly depends on the size (radius) of the MoS nanoflake. For small radius, the system has only one spasing regime when only chirally-matched plasmon mode is generated, while at larger size of MoS, depending on the pump intensity, there are two regimes. In one regime, only the chirally-matched plasmon mode is generated, while in the other regime both chirally-matched and chirally-mismatched modes exist. Different regimes of spaser operation have also opposite handedness of the far-field radiated of the spaser system. Such topological nanospaser has potential applications in different areas of infrared spectroscopy, sensing, probing, and biomedical treatment.
Cite
@article{arxiv.2101.07094,
title = {TMDC-based topological nanospaser: single and double threshold behavior},
author = {Rupesh Ghimire and Fatemeh Nematollahi and Jhih-Sheng Wu and Vadym Apalkov and Mark . I. Stockman},
journal= {arXiv preprint arXiv:2101.07094},
year = {2021}
}
Comments
12 pages, 8 figures