TY - CONF

T1 - Increasing the extraction efficiency of quantum light from 2D materials

AU - Woodhead, Christopher

AU - Roberts, Jonny

AU - Noori, Yasir

AU - Cao, Yameng

AU - Bernardo Gavito, Ramon

AU - Kozikov, Aleksey

AU - Novoselov, Kostya

PY - 2016/7/8

Y1 - 2016/7/8

N2 - Direct bandgap 2D semiconductor materials such as monolayers of transition metaldichalcogenides (TMDCs), show great promise in optoelectronic devices enabling exciting newtechnologies such as ultra-thin quantum light LED’s [1]. These structures can have incredibleadvantages, enabling almost seamless integration into conventional silicon structures. However,extracting light out of these structures can be a challenge, often requiring costly and timeconsuming processing e.g. engineered waveguides or cavities [2]. Furthermore none of thesemethods allow you to observe the light directly, therefore are unhelpful in certain applications,such as an optical version of a quantum unique device [3].We have previously demonstrated that epoxy based solid immersion lenses can be used toincrease light out of semiconductor nanostructures. We furthered this idea to see if they could beused to increase the light out of monolayer TMDC materials; and investigate how the epoxy-2Dmaterial interface affects the emission. Our studies revealed that a SIL can greatly enhance thephotoluminescence of WSe2 by up to 6x (more than theory predicts for a SIL of this shape),without effecting the wavelength (figure 1). However we also found that the epoxy appears toreduce the emission of the MoS2, suggesting that there could be doping effects due to the epoxy.Overall this method shows great promise as a cheap, and scalable method for enhancing theefficiency of low intensity WSe2 based devices.

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

M3 - Abstract

ER -