Fig. 5

Spectral shaping and optical sensing. a Far-field image showing fluorescence from a network that is pumped with checkerboard pattern, with patches of size of 52 × 60 μm. Scale bar is 100 μm. b Measured lasing spectrum obtained when pumping the network with the checkerboard pattern (top), as well pumping it uniformly (bottom). c Calculated map of the lasing mode shift versus the refractive index shift of a selected link. A few modes shift, and mode coupling is evident in the avoided crossings. d Lasing spectrum for a network without (top) and with (bottom) a refractive index shift of the red link, as schematised in the inset