Increasing the extraction efficiency of quantum light from 2D materials

Woodhead, Christopher ORCID: https://orcid.org/0000-0003-1342-0744, Roberts, Jonny, Noori, Yasir, Cao, Yameng, Ramon, Bernardo Gavito, Kozikov, Aleksey and Novoselov, Kostya 2016. Increasing the extraction efficiency of quantum light from 2D materials. Presented at: Unknown,

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Abstract

Direct bandgap 2D semiconductor materials such as monolayers of transition metal<br />dichalcogenides (TMDCs), show great promise in optoelectronic devices enabling exciting new<br />technologies such as ultra-thin quantum light LED’s [1]. These structures can have incredible<br />advantages, enabling almost seamless integration into conventional silicon structures. However,<br />extracting light out of these structures can be a challenge, often requiring costly and time<br />consuming processing e.g. engineered waveguides or cavities [2]. Furthermore none of these<br />methods allow you to observe the light directly, therefore are unhelpful in certain applications,<br />such as an optical version of a quantum unique device [3].<br />We have previously demonstrated that epoxy based solid immersion lenses can be used to<br />increase light out of semiconductor nanostructures. We furthered this idea to see if they could be<br />used to increase the light out of monolayer TMDC materials; and investigate how the epoxy-2D<br />material interface affects the emission. Our studies revealed that a SIL can greatly enhance the<br />photoluminescence of WSe2 by up to 6x (more than theory predicts for a SIL of this shape),<br />without effecting the wavelength (figure 1). However we also found that the epoxy appears to<br />reduce the emission of the MoS2, suggesting that there could be doping effects due to the epoxy.<br />Overall this method shows great promise as a cheap, and scalable method for enhancing the<br />efficiency of low intensity WSe2 based devices.

Item Type:	Conference or Workshop Item (UNSPECIFIED)
Status:	Unpublished
Schools:	Physics and Astronomy
Last Modified:	09 Nov 2022 10:57
URI:	https://orca.cardiff.ac.uk/id/eprint/141232

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