“…Such a resonance effect will lead to larger field enhancement and a finer spectrum, which is beneficial for achieving greater sensing sensitivity. A metasurface based on Fano resonance has more and more applications due to its unique optical properties, and researchers have proposed many metasurface-based optical devices in different fields, including optical filters [ 3 ], optical absorbers [ 4 , 5 ], encoding images [ 6 ], and angle sensors [ 7 ]. With the rapid development of nanotechnology, different metasurface sensors based on Fano resonance also have been reported, such as refractive index sensors [ 8 , 9 , 10 , 11 , 12 ], biosensors [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ], and gas sensors [ 21 ].…”