Fig. 3From: Nano-structured transmissive spectral filter matrix based on guided-mode resonancesa Transmission spectra of the GMR filter with a grating period ranging from 220 nm to 720 nm, covering the wavelengths from 386 nm to 1060 nm. b Angle dependence of the GMR filter with the incident angle ranging from − 85° to 85°. c A zoomed region from Fig (b) up to ±20°Back to article page