Figure 1
From: Polariton hyperspectral imaging of two-dimensional semiconductor crystals
Experimental setup and characterisation. (a) A fiber-based microcavity couples to monolayer WS2 covered with a thin film of PMMA on top of a silver (Ag) mirror capped with a dielectric spacer (SiO2). The planar mirror is mounted on a 3D nanopositioning stage to enable raster-scanning of the sample through the cavity mode and coarse tuning of the mirror separation. The cavity length and thus its resonance frequency can be fine-tuned by a piezo actuator moving the fiber. (b) White light transmission spectrum of the empty cavity for a large mirror separation d = 10.5 μm. (c) Confocal PL map of a WS2 flake on the mirror (scale bar 10 μm). (d) Confocal PL (orange) and cavity-assisted absorption (blue) spectra recorded on a typical position of a WS2 flake on the mirror.
