RT Journal Article
SR Electronic
T1 Real-time frequency-encoded spatiotemporal focusing through scattering media using a programmable 2D ultrafine optical frequency comb
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaay1192
DO 10.1126/sciadv.aay1192
VO 6
IS 8
A1 Wei, Xiaoming
A1 Shen, Yuecheng
A1 Jing, Joseph C.
A1 Hemphill, Ashton S.
A1 Yang, Changsheng
A1 Xu, Shanhui
A1 Yang, Zhongmin
A1 Wang, Lihong V.
YR 2020
UL http://advances.sciencemag.org/content/6/8/eaay1192.abstract
AB Optical wavefront shaping is a powerful tool for controlling photons in strongly scattering media. Its speed, however, has been the bottleneck for in vivo applications. Moreover, unlike spatial focusing, temporal focusing from a continuous-wave source has rarely been exploited yet is highly desired for nonlinear photonics. Here, we present a novel real-time frequency-encoded spatiotemporal (FEST) focusing technology. FEST focusing uses a novel programmable two-dimensional optical frequency comb with an ultrafine linewidth to perform single-shot wavefront measurements, with a fast single-pixel detector. This technique enables simultaneous spatial and temporal focusing at microsecond scales through thick dynamic scattering media. This technology also enabled us to discover the large-scale temporal shift, a new phenomenon that, with the conventional spatial memory effect, establishes a space-time duality. FEST focusing opens a new avenue for high-speed wavefront shaping in the field of photonics.