TMDC-based topological nanospaser: single and double threshold behavior
| Autor: | Rupesh Ghimire, Mark I. Stockman, Fatemeh Nematollahi, Jhih-Sheng Wu, Vadym Apalkov |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Condensed Matter - Mesoscale and Nanoscale Physics Double threshold Near-field optics Physics::Optics FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology Topology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials 010309 optics Optical pumping 0103 physical sciences Monolayer Valleytronics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Spaser Electrical and Electronic Engineering 0210 nano-technology Plasmon Biotechnology Physics - Optics Optics (physics.optics) |
| DOI: | 10.48550/arxiv.2101.07094 |
| Popis: | We theoretically study a topological nanospaser, which consists of a silver nanospheroid and MoS$_2$ 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$_2$. We apply external circularly polarized light that selectively pumps only one of the valleys of MoS$_2$. The generated spaser dynamics strongly depends on the size (radius) of the MoS$_2$ 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$_2$, 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. Comment: 12 pages, 8 figures |
| Databáze: | OpenAIRE |
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