Design of a solar-blind ultraviolet band-pass filter based on frequency domain superposition

In this paper, a band-pass filter based on photonic crystals is designed by using the principle of frequency domain superposition. The influence of the heterostructure position, period numbers and incidence angles on transmission spectrums are analyzed. The filter can achieve efficient filtering in 240-280 nm solar-blind ultraviolet band, with an average transmittance of 72.2%. Simultaneously, a good band-stop appears in near ultraviolet and visible region (300-700 nm) and its average transmittance is below 3.4%. It provides a choice in the application of solar-blind ultraviolet detection technology.