Wood, S; Richheimer, F; Vincent, T; Tong, V; Catanzaro, A; Cao, Y; Kazakova, O; de Castro, F A (2023) Curvature-enhanced localised emission from dark states in wrinkled monolayer WSe2 at room temperature. Science and Technology of Advanced Materials, 24 (1). 2278443

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Abstract

Localised emission from defect states in monolayer transition metal dichalcogenides is of great interest for optoelectronic and quantum device applications. Recent progress towards high temperature localised emission relies on the application of strain to induce highly confined excitonic states. Here we propose an alternative paradigm based on curvature, rather than strain, achieved through free-standing wrinkles of monolayer tungsten diselenide (WSe2). We probe these nanostructures using tip-enhanced optical spectroscopy to reveal the spatial localisation of out-of-plane polarised emission from the WSe2 wrinkles. Based on the photoluminescence and Raman scattering signatures resolved with nanoscale spatial resolution, we propose the existence a manifold of spin-forbidden excitonic states that are activated by the local curvature of the WSe2. We are able to access these dark states through the out-of-plane polarised surface plasmon polariton resulting in enhanced strongly localised emission at room temperature, which is well-suited to application in quantum technologies and photonic devices.

Item Type:	Article
Keywords:	Transition metal dichalcogenide; monolayer WSe2; tip-enhanced optical spectroscopy; localised emission; curvature
Subjects:	Advanced Materials > Functional Materials
Divisions:	Electromagnetic & Electrochemical Technologies
Identification number/DOI:	10.1080/14686996.2023.2278443
Last Modified:	25 Mar 2024 15:16
URI:	http://eprintspublications.npl.co.uk/id/eprint/9948

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