Influence of optical forces on nonlinear optical frequency conversion in nanoscale waveguide devices

Zhen Xing Wu, Wei Luo, Shi Han Tang, Fei Xu, Yan Qing Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

We theoretically investigate the influence of optical gradient forces on nonlinear frequency conversion in a typical nanoscale optomechanical system, which consists of two parallel, suspended waveguides. The waveguides deform with the input power and the phasematching wavelength changes along the waveguides. Utilizing the spread of deformations collectively allows phase matching over a wider range of pump wavelengths. The third harmonic phase-matching wavelength shift can be as large as 3.6 nm/mW when the waveguide length is 100 ìm and the initial gap is 150 nm. It is analogous to chirping the poling period of quasi-phase-matched devices to extend their bandwidths, and allows broad third harmonic to be generated for uses such as biological spectroscopy. Finally, we discuss the conversion efficiency and the optimal phasematching wavelength with a single-frequency pump.

Original languageEnglish
Pages (from-to)1633-1640
Number of pages8
JournalOptics Express
Volume24
Issue number2
DOIs
Publication statusPublished - 25 Jan 2016
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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