抄録
Optical phased arrays (OPAs) integrated on compact semiconductor chips have recently attracted great
interest for various imaging applications due to their high-speed non-mechanical beam-forming functionalities.
While large-scale OPAs with thousands of optical antennas can be fabricated using the current
state-of-art nanofabrication technologies, one inherent problem toward implementing them in actual
systems is the difficulty of precisely controlling a massive number of phase shifters. In this article, we
introduce our unique approaches to tackle this issue. First, a speckle-based single-pixel imaging scheme
is applied to OPA to achieve robust imaging capability without precise tuning of phase controllers. We
also show that spatial resolution is enhanced by transmitting the output light from an OPA through a
multimode fiber. Finally, ultrahigh-resolution imaging with over 19000 resolvable points is demonstrated
by introducing the concept of a non-redundant array to judiciously locate optical antennas on a silicon
OPA chip.
