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Coupling Emission from Single Localized Defects in Two-Dimensional Semiconductor to Surface Plasmon Polaritons

TitleCoupling Emission from Single Localized Defects in Two-Dimensional Semiconductor to Surface Plasmon Polaritons
Publication TypeJournal Article
Year of Publication2017
AuthorsT. Cai, S. Dutta, S. Aghaeimeibodi, Z. Yang, S. Nah, J. T. Fourkas, and E. Waks
JournalNANO LETTERS
Volume17
Pagination6564-6568
Date PublishedNOV
Type of ArticleArticle
ISSN1530-6984
Keywords2D semiconductors, defect emission, silver nanowire, Surface plasmon polaritons, transition metal dichalcogenide, tungsten diselenide
Abstract

Coupling of an atom-like emitter to surface plasmons provides a path toward significant optical non-linearity, which is essential in quantum information processing and quantum networks. A large coupling strength requires nanometer-scale positioning accuracy of the emitter near the surface of the plasmonic structure, which is challenging. We demonstrate the coupling of single localized defects in a tungsten diselenide (WSe2) monolayer self-aligned to the surface plasmon mode of a silver nanowire. The silver nanowire induces a strain gradient on the monolayer at the overlapping area, leading to the formation of localized defect emission sites that are intrinsically close to the surface plasmon. We measured an average coupling efficiency with a lower bound of 26% +/- 11% from the emitter into the plasmonic mode of the silver nanowire. This technique offers a way to achieve efficient coupling between plasmonic structures and localized defects of two-dimensional semiconductors.}, %%Address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA

DOI10.1021/acs.nanolett.7b02222