Inducing and Probing Localized Excitons in Atomically Thin Semiconductors via Tip-Enhanced Cavity-Spectroscopy
- Authors
- Lee, Hyeongwoo; Kim, Inki; Park, Chulho; Kang, Mingu; Choi, Jinseong; Jeong, Kwang-Yong; Mun, Jungho; Kim, Yeseul; Park, Jeonghoon; Raschke, Markus B.; Park, Hong-Gyu; Jeong, Mun Seok; Rho, Junsuk; Park, Kyoung-Duck
- Issue Date
- Aug-2021
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- cavity-spectroscopy; localized exciton; nano-cavity; plasmonic structures; purcell effect; tip-enhanced photoluminescence
- Citation
- Advanced Functional Materials, v.31, no.33, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- Advanced Functional Materials
- Volume
- 31
- Number
- 33
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/141440
- DOI
- 10.1002/adfm.202102893
- ISSN
- 1616-301X
- Abstract
- In atomically thin semiconductors, localized exciton (X-L) coupled to light provides a new class of optical sources for potential applications in quantum communication. However, in most studies, X-L photoluminescence (PL) from crystal defects has mainly been observed in cryogenic conditions because of their sub-wavelength emission region and low quantum yield at room temperature. Hybrid-modality of cavity-spectroscopy to induce and probe the X-L emissions at the nanoscale in atomically thin semiconductors is presented. By placing a WSe2 monolayer on the two extremely sharp Au tips in a bowtie antenna with a radius of curvature of <1 nm, tensile strain of approximate to 0.3% is effectively induced in a L states. The Au tip then approaches the strained crystal region to enhance the X-L emissions and probe them with tip-enhanced photoluminescence (TEPL) spectroscopy at room temperature. Through this triple-sharp-tips cavity-spectroscopy with <15 nm spatial resolution, TEPL enhancement as high as approximate to 4.0 x 10(4) by the Purcell effect is achieved, and peak energy shifts of X-L up to approximate to 40 meV are observed. This approach combining nano-cavity and -spectroscopy provides a systematic way to induce and probe the radiative emission of localized excitons in 2D semiconductors offering new strategies for dynamic quantum nano-optical devices.
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