Topological nanospaser
- Georgia State Univ., Atlanta, GA (United States). Dept. of Physics and Astronomy. Center for Nano-Optics (CeNO)
We propose a nanospaser made of an achiral plasmonic–metal nanodisk and a two-dimensional chiral gain medium – a monolayer nanoflake of a transition-metal dichalcogenide (TMDC). When one valley of the TMDC is selectively pumped (e.g. by a circular-polarized radiation), the spaser (surface plasmon amplification by stimulated emission of radiation) generates a mode carrying a topological chiral charge that matches that of the gain valley. There is another, chirally mismatched, time-reversed mode with exactly the same frequency but the opposite topological charge; it is actively suppressed by the gain saturation and never generates, leading to a strong topological protection for the generating matched mode. This topological spaser is promising for use in nano-optics and nanospectroscopy in the near field especially in applications to biomolecules that are typically chiral. Another potential application is a chiral nanolabel for biomedical applications emitting in the far field an intense circularly polarized coherent radiation.
- Research Organization:
- Georgia State Univ., Atlanta, GA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- FG02-01ER15213; SC0007043
- OSTI ID:
- 1800016
- Journal Information:
- Nanophotonics (Online), Vol. 9, Issue 4; ISSN 2192-8614
- Publisher:
- de GruyterCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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