Figure 1.

Photodetector concept for slow light monitoring inside a photonic crystal [19]. (a) Schematics of a graphene-based spectrally broadband photodetector for optical readout from within a spatially chirped photonic crystal. The photodetector has to be optically thin and non-perturbing to the localisation of slow light and consists of a nanomembrane of Si₃N₄, electrodes, and a graphene layer over the top (or below the contacts). (b) Side-view of the photodetector embedded inside the photonic crystal and modeling of light intensity inside photonic crystal at the slow light mode. It shows spatial localisation of the $E_z$ field component in the plane of the photodetector (calculations were carried without a simulated detector) [25,26]. (c) Electron-microscope image of photonic crystal with a spatial chirp (vertical) polymerised out of a negative-tone SZ2080 resist.