We fabricate amultilayer Fabry–Perot filter (FPF) on a GaN-on-silicon platform. Being significantly different from conventional thin film FPFs formed on smooth flat surfaces, this FPF is deposited in a micropit, and takes a suspended GaN membrane as its carrier, which makes the whole structure ultracompact. The reflection spectra of the FPF are characterized by using an angle-resolved microreflection measurement system. The experimental.results showthat its spectra generally have a considerable blue s
