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arXiv · 1911.03523

Topological Nanospaser

Rupesh Ghimire·Jhih-Sheng Wu·Vadym Apalkov·Mark I. Stockman
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Abstract

We propose a nanospaser made of an achiral plasmonic-metal nanodisk and a two-dimensional chiral gain medium -- a monolayer transition-metal dichalcogenide (TMDC). When one valley of the TMDC is selectively pumped (e.g., by a circular-polarized radiation), the spaser generates a mode carrying a topological charge (chirality) that matches that of the gain valley. The chirally mismatched, time-reversed mode has exactly the same frequency but the opposite topological charge; it is actively suppressed by the gain saturation (population clamping) and never generates leading to a strong topological protection for the generating matched mode. This topological spaser is promising for the use in nanooptics 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.

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Rupesh Ghimire, Jhih-Sheng Wu, Vadym Apalkov, Mark I. Stockman. 2019-11-08. Topological Nanospaser. https://arxiv.org/abs/1911.03523

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