Patent Document ID: 9442228
Application ID: 14825058
Patent Status: 1

Claim One:
1. A camera for sensing incident light within a wavelength band of interest, the camera comprising: an optical element operable to converge the incident light; an array of pixels spaced from the optical element and defining a focal plane in a path of the converged incident light; and a phase grating in the path of the converged incident light and spaced from the array of pixels to cast an interference pattern on the array of pixels, the phase grating spaced from the array of pixels by more than fifteen microns and including: boundaries of odd symmetry separating stepped features on opposite sides of each boundary, the stepped features on the opposite sides of each boundary offset from the array by half of a wavelength within the wavelength band of interest, plus an integer multiple of the wavelength, to produce curtains of destructive interference at the array of pixels.