Abstract
A slim optical fingerprint recognition sensor (OFRS) based on a
grating input coupler and a microprism sensing surface is proposed. By
using a subwavelength grating coupler, input light is coupled into the
planar waveguide and the propagation angle is well engineered to avoid
image overlap, thus an undistorted fingerprint is captured. For
maintaining a thin structure, a microprism array is utilized to facilitate
the breaking of total internal reflection under a large diffraction angle
from the grating. The feasibility, efficiency, and image quality of the
proposed structure are verified and discussed. The device has the
advantages of a slim structure, a high image contrast, and a compact
architecture, suitable for mobile devices.
© 2016 Chinese Laser Press
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