Analysis of Interaction between Optical Waves and Magnetostatic Surface Waves in Three-Dimensional Optical Waveguide Using Multilayered Garnet Structure
Optical-MSSW interaction has received wide interest for realization of thin film devices for optical signal processing at microwave signal frequency. In this paper, a device structure to obtain optical-MSSW interaction in a threedimensional optical waveguide using a multilayered garnet structure is proposed and analyzed. The multilayered structure enables optimization of the waveguide parameters, separately, for optical and MSSW propagation. Interaction in a threedimensional optical waveguide is promising for integration of the device with other optical integrated circuits. Optical and MSSW propagation characteristics in the multilayered device are investigated and the optical mode conversion characteristics between the Ez pq and the E x pq modes supported by the three-dimensional optical waveguide are derived. The dependence of the mode coupling coefficient on the waveguide parameters, such as the film thicknesses, waveguide width, saturation magnetization, and the MSSW power is also analyzed. It is demonstrated through a numerical example that, by proper selection of the waveguide parameters, it is possible to achieve practical device dimensions. key words: MSSW, microstrip, waveguide, garnet, mode cou-
An optical frequency shifter using magnetostatic waves
The optical frequency shift in the collinear magnetostatic wave–optical guided mode interaction has been observed by directly measuring the change in optical wavelength due to magnetostatic waves in the 2–12 GHz range. The experimental shift is found to be in good agreement with the theoretically predicted value of 0.058 A/GHz at λ0=1.319 μm.
DIFFRACTION OF LIGHT BY ELASTIC WAVES IN YIG
The first observations of light diffracted by elastic waves propagating in a ferrimagnetic material (yttrium iron garnet) are reported and discussed, and the values of the photoelastic tensor components of YIG are presented.