PHASE GRATINGS WITH ODD SYMMETRY FOR HIGH-RESOLUTION LENSLESS OPTICAL SENSING

摘要

Image-sensing devices include odd-symmetry gratings that cast interference patterns over a photodetector array. Grating features offer considerable insensitivity to the wavelength of incident light, and also to the manufactured distance between the grating and the photodetector array. Photographs and other image information can be extracted from interference patterns captured by the photodetector array. Images can be captured without a lens, and cameras can be made smaller than those that are reliant on lenses and ray-optical focusing.

主权项

1. A sensing device comprising:
a photodetector array; and a phase grating overlying the photodetector array and defining a transverse plane, the phase grating producing, for light in a wavelength band of interest incident the grating and normal to the transverse plane of the grating, normally arranged curtains of minimum intensity between the phase grating and the photodetector array, each of the curtains of minimum intensity created by destructive phase interference between first phase-grating features located to one side of the curtain and paired second phase-grating features located to the other side of the curtain.