Spectral band-pass filter having high selectivity and controlled polarization

摘要: According to one aspect, the invention relates a spectral band-pass filter, which is optimized for transmission of an incident wave at least first given central wavelength 4, and includes: metal grating having thickness (t) greater than approximately .lambda.0/50 including set substantially identical, parallel slots width (W) less around .lambda.0/10, being spaced apart periodically or quasi-periodically according period that said wavelength, layer dielectric material (h) refractive index (n2), coupled form waveguide waves diffracted by grating, designed such only orders 0 ~ 1 normal incidence .lambda.0 are in material, assembly suspended, during use, fluid close 1.