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Evanescent-wave bonding between optical waveguides.

Michelle L Povinelli¹, Marko Loncar, Mihai Ibanescu

¹Department of Physics and the Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge 02139, USA.

|December 1, 2005

Summary

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Optical forces between parallel microphotonic waveguides can be attractive or repulsive, controlled by input phase. These forces are strong enough in silicon-on-insulator to cause measurable displacements, enabling new tunable devices.

Area of Science:

Photonics
Optics
Materials Science

Background:

Microphotonic waveguides are crucial components in integrated optics.
Understanding inter-waveguide interactions is essential for device design.

Purpose of the Study:

To calculate forces arising from guided wave overlap in parallel microphotonic waveguides.
To investigate the tunability of these forces via relative input phase.
To assess the potential for observable displacements in practical material systems.

Main Methods:

Theoretical calculation of forces between guided waves.
Modeling using realistic parameters for silicon-on-insulator (SOI) material.
Analysis of force dependence on relative input phase.

Related Experiment Videos

Main Results:

Both attractive and repulsive forces were identified.
The magnitude and direction of forces are controllable by relative input phase.
Calculated forces in SOI are sufficient to induce observable waveguide displacements.

Conclusions:

Optical forces between waveguides offer a mechanism for optically tunable microphotonic devices.
These findings support the development of microstructured artificial materials with tunable optical properties.