Influence of Materials and Cavities on Optical Force in Dielectric Waveguide and Simulation of Optical Force in Split Optical Ring Resonator
Date Issued
2015
Date
2015
Author(s)
Kao, Wei-Chun
Abstract
We analyze the optical force in waveguide. Four topics, which are planar waveguides, waveguides with metamaterial, cavities in waveguide and split optical ring resonator will be discussed. We hope the optical force we simulated can be used in practical way. The analytical solution of optical force in plane dielectric waveguide has been derived. First we compare our FEM simulation with analytical solution, and then we modify the materials except waveguide, studying the effect on force. The result shows as the permittivity of gap between waveguides is larger than that of waveguide, the force turns to repulsive. The higher mode of electric field appears as the distance between waveguides and the ratio of permittivity of gap and waveguide increase. We have also derived the analytical solution of the force in waveguide with metamaterial. We find the force becomes discontinuous with the increasing thickness of metamaterial, and the force is a function of the difference between distance and thickness of metamaterial. These phenomenon could be explained due to the dispersion relation of the system. In addition, negative increasing the permittivity of metamaterial makes the curve of force shift. It is known that ellipse cavities in waveguide make the force stronger. We will study the influence of modifying the geometrical parameters and amount of the ellipse cavities on force. Also we will show the relation between force, transmittance and reflectance of electromagnetic wave in the structure. A new structure named “split optical ring resonator,” which has a split on the ring waveguide of the resonator is built. Because the light could be limited in the ring, the field could be also enhanced. As the transmission of resonator is the lowest, the force on split reaches the maximum. The best coupling location, or the maximum force can be found by modifying the distance between the ring and the straight waveguide.
Subjects
Optomechanics；Optical force；Dielectric waveguide；Metamaterial；Optical ring resonator
Type
thesis
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