Patent ID: 11946930
Assignee: HOFFMANN-LA ROCHE, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 3:
4. The device according to claim 1, wherein a minimum distance dmin between adjacently arranged straight parallel lines of the plurality of straight parallel lines, measured in the predetermined propagation direction, is defined according to the equation

dmin=λ/(N−nc sin α)

wherein
α is a longitudinal angle between the predetermined detection direction and a normal to the outer surface of the planar waveguide, measured in the predetermined propagation direction,
λ is the vacuum wavelength of the coherent light,
N is the effective refractive index of the coherent light propagating through the planar waveguide, and
nc is the refractive index of a medium on the outer surface of the planar waveguide,
and wherein the adjacently arranged straight parallel lines of the plurality of straight parallel lines are arranged at a distance d from each other which is an integer multiple of the minimum distance dmin.