Fig. 1
From: Single-shot on-chip spectral sensors based on photonic crystal slabs
Different spectrometers and their spectral responses. a The spectral responsivity of grating or microcavity spectrometers has a single sharp peak. The spectrum is measured by point-wise sampling. b The spectral responsivity of a Fourier-transform spectrometer is a sinusoidal function. The period varies to perform sampling based on Fourier basis. c Photonic-crystal (PC) slabs create complex and variable spectral responsivity depending on the structures. They randomly sample the incident light
