title: Single CdTe Nanowire Optical Correlator for Femtojoule Pulses.
abstract: On the basis of the transverse second harmonic generation (TSHG) in a highly nonlinear subwavelength-diameter CdTe nanowire, we demonstrate a single-nanowire optical correlator for femto-second pulse measurement with pulse energy down to femtojoule (fJ) level. Pulses to be measured were equally split and coupled into two ends of a suspending nanowire via tapered optical fibers. The couterpropagating pulses meet each other around the central area of the nanowire, and emit TSHG signal perpendicular to the axis of the nanowire. By transferring the spatial intensity profile of the transverse second harmonic (TSH) image into the time-domain temporal profile of the input pulses, we operate the nanowire as a miniaturized optical correlator. Benefitted from the high nonlinearity and the very small effective mode area of the waveguiding CdTe nanowire, the input energy of the single-nanowire correlator can go down to fJ-level (e.g., 2 fJ/pulse for 1064 nm 200 fs pulses). The miniature fJ-pulse correlator may find applications from low power on-chip optical communication, biophotonics to ultracompact laser spectroscopy.
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University , Hangzhou 310027, China.
authors.forename: Chenguang
authors.initials: C
authors.lastname: Xin
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University , Hangzhou 310027, China.
authors.forename: Shaoliang
authors.initials: S
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University , Hangzhou 310027, China.
authors.forename: Qingyang
authors.initials: Q
authors.lastname: Bao
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University , Hangzhou 310027, China.
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University , Hangzhou 310027, China.
authors.forename: Bigeng
authors.initials: B
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University , Hangzhou 310027, China.
authors.forename: Yipei
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University , Hangzhou 310027, China.
authors.forename: Yingxin
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: Zongyin
authors.initials: Z
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University , Hangzhou 310027, China.
authors.forename: Limin
authors.initials: L
authors.lastname: Tong
keywords: Semiconductor nanowires; femtojoule pulses; optical correlator; second-harmonic generation; ultrashort pulse measurement