DIRECTION-SELECTIVE INTERFEROMETRIC OPTICAL FILTER

摘要

The invention relates to a direction-selective interferometric optical filter (30) for spectrometric devices, at least comprising an arrangement of two layered one-dimensional photonic structures (36, 37; 25a, 25b), wherein each of the two structures (36, 37; 25a, 25b) contains a defect layer (32, 34), wherein each photonic structure (36, 37; 25a, 25b) has a dispersion function (f1, f2) in the energy momentum space (E, kx, ky), wherein kx and ky are momentum components of transmitted photons of the photonic structures (36, 37, 25a, 25b) for a defined energy (frequency/wavelength) E in the energy momentum space (E, kx, ky), wherein both photonic structures (36, 37; 25a, 25b) have opposite interfaces (42, 43) which are at a plane-parallel distance (DD) from one another. In this case, the dispersion functions (f1, f2) of both photonic structures (36, 37; 25a, 25b) cross or intersect in the energy momentum space (E, kx, ky) and produce a cut set (A) of rays of waves on the surfaces of the dispersion functions (f1, f2) at a particular energy (E), wherein a ray (A) of waves contains waves (11a, 11b) selectively chosen through the filter (30) at an angle, while other waves (13a, 13b) are reflected by the filter (30) at other angles.