Control methods of the fraction of optical power transferred between two waveguides using a collinear acousto-optic interaction is theoretically investigated. The effect of a surface acoustic wave (a SAW) on the mode coupling between the fundamental even and odd eigenmodes of a directional coupler system is analysed and two control methods of optical power transferred are proposed. The required SAW powers of the switched couplers using SAW's and thin-film acousto-optic devices such as optical beam deflectors and optical mode convertors are comparable to one another. The efficiently controllable bandwidth of the optical wavelength λ0 are approximately 100 Å and 40 Å at λ0≃0.63 µm for the symmetric and asymmetric switched couplers with the SAW wavelength of 25 µm and the interaction length of 8 mm. The optical center wavelength of the controllable range can be tuned by the SAW frequency.
Optical near-field interactions allow energy localization at scales smaller than the diffraction limit of light. They also show intrinsic hierarchical responses, meaning that optical nearfields exhibit different physical behavior at different scales. In this paper, by combining the localized energy dissipation and hierarchy properties, we present an architecture for a novel traceable optical memory that records memory access events to each bit, which is useful in applications such as high-security information transfer. The basic principles are demonstrated by numerical simulations using a metal nanostructure.
Integrated optics looks very attractive for the construction of many optical communication devices. This paper presents the results of the study made for the development of a waveguide type optical modulator using Kerr magnetooptic effects in Ni-Fe thin films. Although the modulation depth of the device is limited because of the optical losses in the ferromagnetic film, it is shown that the device is useful from the modulation power requirement point of view which is on the order of a few mW. The experimental measurements have been carried out at a wavelength of 6328 Å with modulation frequency of 60 Hz and the results have been analysed on the ray optic (plane wave) considerations.
A method for determining electron density in cylindrical plasma columns uses surface wave resonances which occur when the length of plasma column is an integral multiple of the half-wavelength of the surface wave. One type of resonance is in an axially symmetric mode, the other in a dipolar mode. A theory is given for the relation of resonance frequency to electron plasma frequency. Experiments were carried out with both propagation modes excited simultaneously; the axially symmetric resonances are at much lower frequencies than the electron plasma.
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