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

Area of Science:

• Optics
• Nanotechnology
• Quantum Optics

Background:

• Nonlinear frequency conversion is crucial for generating new optical frequencies.
• Optomechanical systems offer unique light-matter interactions at the nanoscale.
• Phase matching is essential for efficient nonlinear optical processes.

Purpose of the Study:

• To investigate the impact of optical gradient forces on nonlinear frequency conversion.
• To explore the use of nanoscale optomechanical systems for enhanced frequency conversion.
• To analyze the phase-matching properties in suspended waveguide systems.

Main Methods:

• Theoretical investigation of optical gradient forces.
• Modeling of nanoscale optomechanical systems with suspended waveguides.
• Analysis of waveguide deformation and its effect on phase matching.

Main Results:

• Optical gradient forces induce waveguide deformation, altering phase-matching conditions.
• Deformations enable phase matching over a broader range of pump wavelengths.
• A significant third harmonic phase-matching wavelength shift of 3.6 nm/mW was observed.
• The effect is analogous to chirping in quasi-phase-matched devices for bandwidth extension.

Conclusions:

• Nanoscale optomechanical systems with suspended waveguides can achieve broad third harmonic generation.
• This approach offers potential for applications in areas like biological spectroscopy.
• The findings provide insights into controlling nonlinear optical processes using mechanical effects.