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 language | English |
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Pages (from-to) | 1633-1640 |
Number of pages | 8 |
Journal | Optics Express |
Volume | 24 |
Issue number | 2 |
DOIs | |
Publication status | Published - 25 Jan 2016 |
Externally published | Yes |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics