  Spectral imaging paves way for various fields and particular in biomedical
research. However, spectral imaging mainly depending on spatial or temporal
scanning, cannot achieve high temporal, spatial and spectral resolution
simultaneously. In this study, we demonstrated a silicon real-time
ultra-spectral imaging chip based on reconfigurable metasurfaces, comprising of
155,216 (356$\times$436) image-adaptive micro-spectrometers with ultra-high
center-wavelength accuracy of 0.04 nm and spectral resolution of 0.8 nm. It is
employed for imaging brain hemodynamics, and the dynamic spectral absorption
properties of deoxyhemoglobin and oxyhemoglobin in a rat barrel cortex were
obtained, which enlighten the spectroscopy in vivo studies and other real-time
applications.
