Narrowband Filter
Narrowband filters for biomedical applications operate through interference or absorption. Interference filters typically comprise multiple thin-film layers whose refractive indices and thicknesses are optimized to the design. Adjusting phase differences within the film stack selectively transmits the target wavelength range while blocking or reflecting other wavelengths. Absorptive narrowband filtering is achieved by adding specific absorbers to the substrate to absorb specified wavelengths.
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