Radiative control of dark excitons at room temperature by nano-optical antenna-tip Purcell effect
SCIE
SCOPUS
- Title
- Radiative control of dark excitons at room temperature by nano-optical antenna-tip Purcell effect
- Authors
- Park, Kyoung-Duck; Jiang, Tao; Clark, Genevieve; Xu, Xiaodong; Raschke, Markus B.
- Date Issued
- 2018-01
- Publisher
- Nature Publishing Group
- Abstract
- Excitons, Coulomb-bound electron-hole pairs, are elementary photo-excitations in semiconductors that can couple to light through radiative relaxation. In contrast, dark excitons (X-D) show anti-parallel spin configuration with generally forbidden radiative emission. Because of their long lifetimes, these dark excitons are appealing candidates for quantum computing and optoelectronics. However, optical read-out and control of XD states has remained challenging due to their decoupling from light. Here, we present a tip-enhanced nano-optical approach to induce, switch and programmably modulate the XD emission at room temperature. Using a monolayer transition metal dichalcogenide (TMD) WSe2 on a gold substrate, we demonstrate similar to 6 x 10(5)-fold enhancement in dark exciton photoluminescence quantum yield achieved through coupling of the antenna-tip to the dark exciton out-of-plane optical dipole moment, with a large Purcell factor of >= 2 x 10(3) of the tip-sample nano-cavity. Our approach provides a facile way to harness excitonic properties in low-dimensional semiconductors offering new strategies for quantum optoelectronics.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/114702
- DOI
- 10.1038/s41565-017-0003-0
- ISSN
- 1748-3387
- Article Type
- Article
- Citation
- Nature Nanotechnology, vol. 13, no. 1, page. 59 - 64, 2018-01
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- There are no files associated with this item.
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