Toward optical coherence tomography on a chip: in vivo three-dimensional human retinal imaging using photonic integrated circuit-based arrayed waveguide gratings

摘要

Broad bandwidth light diverges laterally in the input star coupler toward the array of waveguides. There, each waveguide forwards a portion of the input light toward the output star coupler, resulting in different phase delays caused by the different optical path lengths of the individual waveguides. At the focal line on the image plane of the output star coupler, only plane waves with the same phase delay constructively interfere; therefore, each output waveguide forwards individual wavelengths