The converter between rectangular guide and trapezoidal-groove guide is designe d, and it’s cut-off characteristic is analyzed by finite-element method.

In order to use the cut-off characteristic of planar optical waveguides for monitoring chemical and biochemical reaction timely, we present an detail theoretical analysis of three-layer and four-layer waveguids.

Some useful results were obtained from the numerical calculation for this guide to analyze its dispersion characteristic and cut-off characteristic of the dominant mode and second-order mode.

Research results show that the combined detecting system possesses fine pulse compression performance,range cut-off characteristic and the superiority which other radar signals are not provided with.

The mode cutoff equation of the multiple quantum well optical waveguidescomposed of two materials is derived. The cutoff characteristic of the strained Ge. Si1-x/Simultiple quantum well optical waveguides grown on Si substrate is analyzed.

The light-cut-off method based on an exceedingly reliable formula for black-body radiation is presented. The cut-off wavelengths of Hg_(1-x)Cd_xTe sample are measured by use of the light cut-off characteristics of Hg_(1-x)Cd_xTe, and then the compositions are found through empirical formula of E_g vs x.

Taking the rectangular guide partially filled with inhomogeneous dielectric as an example, the dispersion and cut-off characteristics are numerically calculated and analyzed, and accuracy of the method is verified.

Compared with other numerical method, facility of FDTD was distinctive for just one time computation for all. The cut-off characteristics of metal waveguide, loaded waveguide, resonator and loaded resonator were computed, and comparison with datas was given to illustrate of the applicability of FDTD method.

This paper analyzes the cut-off characteristics of domain mode and higher order ones in circular-rectangular waveguide and cut circular waveguide, gives some design formulae and curves. The results are agreed well with theory values in the particular case of circular waveguide and rectangular one.

The mode cutoff equation of the multiple quantum well optical waveguidescomposed of two materials is derived. The cutoff characteristic of the strained Ge. Si1-x/Simultiple quantum well optical waveguides grown on Si substrate is analyzed.

Some dispersion and cut-off characteristics of H-guides with double and four dielectric strips are numerically calculated and some valuable results are got.

Rectangular guide partially filled with 1-D inhomogeneous dielectric slab is exemplified, its dispersion and cut-off characteristics are numerically calculated and analyzed, and the correctness of the analytic model is demonstrated as well.

Their dispersion and cut-off characteristics of the dominant mode are analysed and compared with ones of the closed V-and circular- groove guides by using the equivalent network method.

This comes from the used cut-off characteristics of the CPC's and the size range used for the DMPS system.

Technical properties of some commercial filter glasses of the near IR cut-off type are given; they are made by introducing CdSe-CdTe into ZnO containing glasses.The effects of ZnO content and heat treatment on the cut-off characteristics as well as the choice of colourants have been discussed.

The characteristic equation is derived for the LP modes of quadruple-clad fibers. Normalized cutoff frequencies of a few lowest modes are accurately calculated and their universal curves for a variety of structure parameters are presented. It is shown that the cutoff properties of quadruple-clad libers are different from those of singly and doubly elad fibers. The height and thickness of the second cladding shoudn't be too large in order to obtain single mode operation at the interesting wavelength.

The light-cut-off method based on an exceedingly reliable formula for black-body radiation is presented. The cut-off wavelengths of Hg_(1-x)Cd_xTe sample are measured by use of the light cut-off characteristics of Hg_(1-x)Cd_xTe, and then the compositions are found through empirical formula of E_g vs x. The transverse composition distribution of Hg_(1-x)Cd_xTe samples is obtained by use of two-dimensional scan. The measured rms error of the composition is well coincident with the results measured with the method...

The light-cut-off method based on an exceedingly reliable formula for black-body radiation is presented. The cut-off wavelengths of Hg_(1-x)Cd_xTe sample are measured by use of the light cut-off characteristics of Hg_(1-x)Cd_xTe, and then the compositions are found through empirical formula of E_g vs x. The transverse composition distribution of Hg_(1-x)Cd_xTe samples is obtained by use of two-dimensional scan. The measured rms error of the composition is well coincident with the results measured with the method of electric probe.