%0 Journal Article
%T Ultra-compact optical auto-correlator based on slow-light enhanced third harmonic generation in a silicon photonic crystal waveguide
%A Christelle Monat
%A Christian Grillet
%A Matthew Collins
%A Alex Clark
%A Jochen Schroeder
%A Chunle Xiong
%A Juntao Li
%A Liam O'Faolain
%A Thomas F. Krauss
%A Benjamin J. Eggleton
%A David J. Moss
%J Physics
%D 2014
%I arXiv
%R 10.1038/ncomms4246
%X The ability to use coherent light for material science and applications is directly linked to our ability to measure short optical pulses. While free-space optical methods are well-established, achieving this on a chip would offer the greatest benefit in footprint, performance, flexibility and cost, and allow the integration with complementary signal processing devices. A key goal is to achieve operation at sub-Watt peak power levels and on sub-picosecond timescales. Previous integrated demonstrations require either a temporally synchronized reference pulse, an off-chip spectrometer, or long tunable delay lines. We report the first device capable of achieving single-shot time-domain measurements of near-infrared picosecond pulses based on an ultra-compact integrated CMOS compatible device, with the potential to be fully integrated without any external instrumentation. It relies on optical third-harmonic generation in a slow-light silicon waveguide. Our method can also serve as a powerful in-situ diagnostic tool to directly map, at visible wavelengths, the propagation dynamics of near-infrared pulses in photonic crystals.
%U http://arxiv.org/abs/1404.4905v1