Six‐wave mixing induced by free‐carrier plasma in silicon nanowire waveguides
Abstract
Nonlinear wave mixing in mesoscopic silicon structures is a fundamental nonlinear process with broad impact and applications. Silicon nanowire waveguides, in particular, have large third‐order Kerr nonlinearity, enabling salient and abundant four‐wave‐mixing dynamics and functionalities. Besides the Kerr effect, in silicon waveguides two‐photon absorption generates high free‐carrier densities, with corresponding fifth‐order nonlinearity in the forms of free‐carrier dispersion and free‐carrier absorption. However, whether these fifth‐order free‐carrier nonlinear effects can lead to six‐wave‐mixing dynamics still remains an open question until now. Here we report the demonstration of free‐carrier‐induced six‐wave mixing in silicon nanowires. Unique features, including inverse detuning dependence of six‐wave‐mixing efficiency and its higher sensitivity to pump power, are originally observed and verified by analytical prediction and numerical modeling. Additionally, asymmetric sideband generation is observed for different laser detunings, resulting from the phase‐sensitive interactions between free‐carrier six‐wave‐mixing and Kerr four‐wave‐mixing dynamics. These discoveries provide a new path for nonlinear multi‐wave interactions in nanoscale platforms. image
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 04, 2016
- Source ID
- 10.1002/lpor.201600124
Entities
People
- Chee Wei Wong
- Heng Zhou
- Kun Qiu
- Linjie Zhou
- Mingle Liao
- Shu‐wei Huang
Organizations
- Air Force Office of Scientific Research
- National Sleep Foundation
- Office of Naval Research
- Shanghai Jiao Tong University
- University of California, Los Angeles
- University of Electronic Science and Technology of China