Fig. 2: Chaos-assisted spectrometer design.

a Boundary shape of different deformation parameters α and corresponding calculated PSOSs. b Periodicity and insertion loss as functions of α calculated from the measured spectral response of the fabricated devices. c Estimation of the reconstruction resolution, \(C\left(\Delta \lambda \right)\), around \(\Delta \lambda =0\) for chaotic cavity devices (\(\alpha =0.375\)) with different gaps between bus waveguides and chaotic cavity. d Husimi maps of certain periodic/quasi-periodic resonant mode patterns corresponding to PSOS