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Near-Field Coupling with a Nanoimprinted Probe for Dark Exciton Nanoimaging in Monolayer WSe 2 .
- Source :
-
Nano letters [Nano Lett] 2023 Jun 14; Vol. 23 (11), pp. 4901-4907. Date of Electronic Publication: 2023 Jun 01. - Publication Year :
- 2023
-
Abstract
- Tip-enhanced photoluminescence (TRPL) is a powerful technique for spatially and spectrally probing local optical properties of 2-dimensional (2D) materials that are modulated by the local heterogeneities, revealing inaccessible dark states due to bright state overlap in conventional far-field microscopy at room temperature. While scattering-type near-field probes have shown the potential to selectively enhance and reveal dark exciton emission, their technical complexity and sensitivity can pose challenges under certain experimental conditions. Here, we present a highly reproducible and easy-to-fabricate near-field probe based on nanoimprint lithography and fiber-optic excitation and collection. The novel near-field measurement configuration provides an ∼3 orders of magnitude out-of-plane Purcell enhancement, diffraction-limited excitation spot, and subdiffraction hyperspectral imaging resolution (below 50 nm) of dark exciton emission. The effectiveness of this high spatial X <subscript>D</subscript> mapping technique was then demonstrated through reproducible hyperspectral mapping of oxidized sites and bubble areas.
Details
- Language :
- English
- ISSN :
- 1530-6992
- Volume :
- 23
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- Nano letters
- Publication Type :
- Academic Journal
- Accession number :
- 37262350
- Full Text :
- https://doi.org/10.1021/acs.nanolett.3c00621