title: Optical time lens based on four-wave mixing on a silicon chip.
abstract: We propose a new technique to realize an optical time lens for ultrafast temporal processing that is based on four-wave mixing in a silicon nanowaveguide. The demonstrated time lens produces more than 100 pi of phase shift, which is not readily achievable using electro-optic phase modulators. Using this method we demonstrate 20x magnification of a signal consisting of two 3 ps pulses, which allows for temporal measurements using a detector with a 20 GHz bandwidth. Our technique offers the capability of ultrafast temporal characterization and processing in a chip-scale device.
authors.affiliation: School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA. rs435@cornell.edu
authors.forename: Reza
authors.initials: R
authors.lastname: Salem
authors.forename: Mark A
authors.initials: MA
authors.lastname: Foster
authors.forename: Amy C
authors.initials: AC
authors.lastname: Turner
authors.forename: David F
authors.initials: DF
authors.lastname: Geraghty
authors.forename: Michal
authors.initials: M
authors.lastname: Lipson
authors.forename: Alexander L
authors.initials: AL
authors.lastname: Gaeta