Fig. 3: BIC lasing in etch-free molecular metasurfaces.
From: Highly coherent organic lasing based on etch-free metasurface
a Microscopic image of the etch-free molecular metasurface, outlined by the white, dashed lines, showing the pump laser. b Photoluminescence (PL) image from the molecular metasurface. c, d Angle-resolved PL spectra of the molecular metasurface below and above threshold power, respectively. Above the threshold power, PL spectrum shows a narrow emission at the BIC state near \({\theta }_{x}=0\). e PL spectra as a function of the pulse fluence. Inset shows PL spectrum of BIC lasing at threshold power, measured with higher spectral resolution. f pulse fluence dependence of PL peak intensity (black squares) and linewidth (blue circles) of BIC lasing.
