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Schematic view of spectrometer-on-chip. (a) top view of a chip with the DPH gratings (b) side view displaying input and output channel.
Scanning Electron Microscopy images of gratings defining a DPH hologram using core waveguide: (a) top view, (b) etched line cross-section before stripping residual resist.
Response of a 64-channel silica-on-silicon DPH spectrometer to a probe laser. Top: image of the spectrometer output plane, bottom–corresponding intensity distribution. Channel spacing and pitch are equal to and , respectively. The probe laser bandwidth is .
Central part of a dispersion curve of a 1000-channel DPH spectrometer. Spectral spacing between channels is 0.15 nm. Spatial pitch, which is the distance between channels at the output plane, is .
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