  Fano resonance has raised great attention in nanophotonics attributing to its
unique properties.In this work, we study the imaging function of Fano-resonant
silicon metasurfece governed by quasi-bound states in the continuum (BICs).
First, by breaking the in-plane symmetry of nanodisks, a symmetry-protected
quasi-BIC is excited with the emergence of a sharp Fano resonance. The near
field distributions, multipole contributions and radiation patterns of the
metasurface are performed to uncover the mechanism and characteristics of this
resonance. In addition, we investigate the imaging function of this
Fano-resonant metasurface assisted by phase-change material Ge_2Sb_2Te_5(GST).
Through selective modification of different units from a-GST to c-GST, the
produced transmitted image well reconstructs the target letter. Our finding may
provide a route to achieve efficient metasurface-based imaging and fast spatial
modulations.
