Fig. 3: Optical characterization of OPEN-WS2 samples.
From: Enabling remote quantum emission in 2D semiconductors via porous metallic networks
Cartoon illustrating a strong emission from the suspended TMD and quenched emission where it is supported by Au and b remote excitation and emission from the an OPEN-WS2 film. c PL spectra (log10 intensity) taken from spot 1 and spot 2 in the optical image in d. d Optical and fluorescence images (integrated CCD image) of a monolayer-WS2/Au/SiO2 sample before and after annealing (red box = AFM region from Fig. 2a; scale bar = 50 μm). Regions of Au-Ti were selectively patterned to inhibit dewetting at specific locations. e Fluorescence image of an OPEN-WS2 film on Au with a fixed excitation laser spot (beam FWHM ≈ 3.5 μm, power = 4.5 mW, room temperature (RT)) demonstrating remote excitation of suspended WS2 pixels (truncated intensity scale; scale bar = 10 μm). f Topography and near-field scanning optical microscopy (NSOM) interference pattern originating from SPPs (scale bar = 1 μm; inset scale bar = 2 μm; arrow shows polarization direction). g Horizontal cross-section of near-field intensity taken from f.
