Ryosuke Ozaki

Scattering of Electromagnetic Waves by Multilayered Inhomogeneous Columnar Dielectric Gratings Loaded Rectangular Dielectric Constant

In this paper, we propose a new technique for the scattering problems of multilayered inhomogeneous columnar dielectric gratings loaded rectangular dielectric constant both TM and TE waves using the combination of improved Fourier series expansion method, the multilayer method, and the eigenvalue matrix method. Numerical results are given for the power transmission coefficients in the parameters e 3 /e 0 , c/p, and hid of rectangular cylinders to obtain the basic characteristic of the power transmission coefficients and reflection coefficients switching or frequency selective devices for both TM and TE waves. The influence of the incident angle and frequency of the transmitted power are also discussed in the connection with the propagation constant β in the free mode.

Distribution of energy flow by dielectric waveguide with rhombic dielectric structure along a middle layer

Light propagation in periodic structure waveguide such as photonic crystals waveguide is both theoretical and practical interest in many areas of physics and engineering. As these applications, there are devices such as an optical resonator, an optical waveguide filter, and integrated optical devices. Consequently, in the design of photonic crystal structures with periodic constants identical to the optical wavelength, it is important to investigate the stop band region or photonic band-gaps. Though it is not analyzed the propagation constants in detailed in Bragg region, many analysis results are shown only the distribution of the electromagnetic fields by using the FDTD method or another numerical techniques.

Distribution of energy density by dielectric waveguides with air-hole layer composed of dielectric circular cylinder array

In this paper, we have analyzed the guiding problem for dielectric waveguides with air-hole layer composed of dielectric circular cylinder array by using the combination of improved Fourier series expansion method and multilayer method, and investigate the influence of energy distribution in the defect region. Numerical results are given by both the complex propagation constants at the first stop band region and distribution of energy density for defect area utilizing the propagation constants at the guided region for TE mode. As a result, this paper gives a design of structure for optimum dielectric waveguide to concentrate the energy into the defects.

Distribution of energy flow by dielectric waveguides with different radius composed of dielectric circular cylinder and air cylinder

In this paper, we have analyzed a guiding problem for dielectric waveguides with defects composed of dielectric circular cylinder and air cylinder array by using the combination of improved Fourier series expansion method and multilayer method, and investigate an influence for distribution of energy flow in the defect region by the case of various dielectric and air circular cylinder array with different radius. Numerical results are given by both the complex propagation constants near the first stop band regions and distribution of energy flow into the defect area utilizing the propagation constants at the guided region for TE mode.

Scattering of electromagnetic waves by inhomogeneous dielectric gratings loaded with parallel perfectly conducting strips

In this paper, we have proposed a new method for the scattering of electromagnetic waves by inhomogeneous dielectric gratings loaded with parallel perfectly conducting strips using the combination of improved Fourier series expansion method and point matching method. Our approach also can treat periodic configurations having arbitrary combinations of dielectric, metallic, and perfectly conducting components. Numerical results are given for the transmitted scattered characteristics for the case of frequency loaded with parallel perfectly conducting strips for TE and TM waves.

Analysis of pulse responses from conducting strips with dispersion medium sandwiched air layer

In this paper, we analyzed the pulse response from conducting strips with dispersion medium sandwiched air layer by using a combination of fast inversion of Laplace transform (FILT) method and point matching method (PMM), and investigated from pulse response the influence of periodically conducting strips and depth of air layer. From numerical results, we clarified the effect of the air layer, and characteristics of both air layer and periodically conducting strips are showed by differential waveform.

Analysis of pulse response from two dispersion media with strips

In this paper, we have analyzed the pulse responses from two dispersion media embedded with conducting strips by utilizing the combination of fast inversion of Laplace transform method and point matching method, and investigated an influence of pulse response for both dielectric materials with frequency dependence and conducting strips.

Pulse responses of plane gratings in dispersion media

In this paper, we analyzed the pulse responses of plane gratings in the dispersion media by utilizing the parameters for permittivity properties of complex dielectric constants, and also investigated the influence of both dielectric and conductor by using the combination of the fast inversion Laplace transform (FILT) method and point matching method (PMM). And also, we confirmed the effectiveness and validity for present method compared with exact solution of perfect conductor plate in dispersion media.

Distribution of energy density for dielectric waveguides with various properties of dielectric constants in the middle layer

In this paper, we analyze the dielectric waveguides composed of dielectric circular cylinder and air-hole circular cylinder arrays with various property of dielectric constants in the middle layer, and investigated an effect of dielectric structure in the middle layer by using the combination of improved Fourier series expansion method and multilayer method. In addition, we clarified an influence of dielectric structure in the middle layer through the numerical analysis for TE case.

Energy distribution of dielectric waveguides with arbitrary shape of dielectric constant — the influence of dielectric structures along a middle layer

Recently, optical devices with periodic structures are applied to metamaterial, holography, photonic crystals and so on. In particular, the research of photonic crystal or metamaterials is expected as application of optical confinement, optical switching or optical control, and also that of holography is expected as application of optical lens. As application of our structure, we consider an optical devices such as propagating the electromagnetic wave along the waveguide with the periodically defects. Therefore, it is extremely important to investigate the scattering and guiding problem of electromagnetic waves with periodic structure. On the one hand, photonic crystals such as optical nanostructures with periodically permittivity distribution are known as technology which can be controlled the electromagnetic wave in the periodic structure by using interaction of both the wave nature of light and periodicity. Then, in the design of photonic crystals with periodic array of optical wavelength degree, it is very important to investigate the stop band regions or photonic band gaps. But, the propagation constants of photonic crystal structure at the stop band area are not analyzed in detailed, and also several numerical results are reported only electromagnetic field distribution utilizing the FDTD method and another numerical technique.