Fig. 2: Printed all dielectric longpass, shortpass, and bandpass OIFs.

a Concept of a longpass filter. b SEM cross-section view of the printed filter. c and d Simulated and measured transmittance of the printed longpass filter, respectively. The dashed gray line is the diffuse transmittance. e Concept of a shortpass filter. f SEM cross-section view of the printed filter. g and h Simulated and measured transmittance of the printed shortpass filter, respectively. The dashed gray line is the diffuse transmittance. i Concept and design of a bandpass filter. j SEM cross-section view of the printed filter. k and l Simulated and measured transmittance of the printed bandpass filter, respectively. The dashed gray line is the diffuse transmittance. m Characterization of optical homogeneity in the printed bandpass filter, including peak, cut-on, cut-off wavelength, and full width at half maximum (FWHM). The color stacks next to the SEM images provide an illustration of the layer scheme and functionality. Different colors indicate materials with low or high refractive index (RI), as well as the glass substrate.