The squeezable nanojunction as a tunable light-matter interface for studying photoluminescence of 2D materials

Abstract

We study photoluminescence (PL) of MoS2 monolayers in optical cavities that can be tuned in operando. Technically, we use the recently developed squeezable nanojunction (SNJ). It is a versatile mechanical setup that has been useful to study thermoelectric effects at electronic tunneling distances. Here, we emphasize on a cavity with 0–3 micrometer distance with optical access. Due to the tunable cavity, we see strong distortions of PL spectra. By an analysis of the ensemble, we identify a normalization protocol that gives access to disentangling the contributions from excitation, gating and emission. The systematic evolution of data reconfirms the drastic influence of the local electromagnetic mode budget on the spectral properties. The experiment further underscores the broadband application range of the SNJ technique, able for combining (nano-) electronic functionality with optical access and a tunable light-matter interface.

A point-like thermal light source as a probe for sensing light-matter interaction

“…The underlying physical picture is similar to our previous work 20 where we investigated excitation and emission coupling factors of photoluminescence. However, it provides a conceptual simplification: by using an electrically driven emitter, the influence of spatially dependent excitation is removed.…”

Strain-Dependent Photoluminescence Line Shifts of the TS Color Center in 4H-SiС

“…A 532 nm laser was used for the excitation. Stress is induced by an improved version of the squeezable nanojunction presented in [8]. An artist's impression of the setup is shown in Fig.…”

“…Fig.1: Artist's view of the squeezable nanojunction[8] adjusted for the bending of SiC-sticks. The sample is fixed on both ends and a mandrel presses upwards against the center of the stick, while the sample can be investigated with PL measurements.…”