Figure 1
From: Microwatts continuous-wave pumped second harmonic generation in few- and mono-layer GaSe
(a) Optical microscope image of the GaSe-PC cavity with the GaSe layer shown as light green flakes. Inset displays the PL spectrum of the nine-layer GaSe flake. (b) AFM image of the GaSe-PC cavity, where the thickness of the GaSe layer is indicated at the location of a crack region with a value of 7.8 nm and the dashed lines indicate the locations where the height distributions are measured. (c) SEM image of the GaSe-PC cavity. (d) Cavity’s reflection spectra of the resonant mode before and after the integration of GaSe.
