Figure 2 | Resonance of the monochromatic lights. (a) Schematic model of the conjugated-BIC optical grating with the incident light projects onto the grating. The thicknesses of ITO, SnO2, and ZEP520A are set at 50 nm, 50 nm, and 350 nm, respectively. Field distribution at the grating with the (b) on-resonant light and (c) off-resonant light. Results show that the 540-nm on-resonant light generates a strong resonance with the grating, resulting in monochromatic light confinement. Top-view SEM images of the gratings with resonant wavelength at (d) 455 nm, (e) 540 nm, and (f) 655 nm. Results show that tuning the grating structure can effectively adjust the wavelength of the on-resonant light. Corresponding simulated and experimental transmission spectra of the gratings with resonant wavelength at (g) 455 nm, (h) 540 nm, and (i) 655 nm. On-resonant lights can be effectively confined and off-resonant lights will transmit through the grating, resulting in sharp dips in the transmission spectra.

Figure 3 | Spectral reconstruction and hyperspectral imaging. (a) Broadband and (b) narrowband spectral reconstruction using the integrated spectrometer. The broadband spectrum is generated by a continuous laser while the narrowband spectra are generated by the PL from QD film with different nanocrystal sizes. Results show that the integrated spectrometer is capable of precisely reconstructing input spectra. (c) Schematic measurement setup of the hyperspectral imaging. (d) Reconstructed RGB image and (e) spectral information of the two areas within. Results show that the integrated spectrometer can be used in hyperspectral imaging that resolves the spatial and spectral information.