The dispersion characteristics of a circular dielectric waveguide with periodic metal-lic strips are analyzed by the Galerkin’s method.After obtaining the rigorous dispersion equation,the dispersion curves for both T...The dispersion characteristics of a circular dielectric waveguide with periodic metal-lic strips are analyzed by the Galerkin’s method.After obtaining the rigorous dispersion equation,the dispersion curves for both TE<sub>01</sub>and TM<sub>01</sub>modes are calculated by the improved Newton’smethod.The variations of the normalized center frequency,width and maximum attenuation con-stant of the stopband with the normalized width of the metallic strips are given.The convergenceproperties of numerical solutions are also discussed.On the basis of the analysis,some usefulguidelines for filter design are thereby suggested.展开更多
Dielectric rod arrays in a metallic waveguide alter the propagation modes and group velocities of electromagnetic waves. We focus on TE10-to-TE20 mode converters and investigate the variation in their behavior with fr...Dielectric rod arrays in a metallic waveguide alter the propagation modes and group velocities of electromagnetic waves. We focus on TE10-to-TE20 mode converters and investigate the variation in their behavior with frequency. In this investigation, a mode converter is proposed that passes the TE10 mode at frequencies lower than 2fc, and converts the TE10 mode into the TE40 mode for frequencies higher than 2fc, which is achieved by a combination of TE10-TE20 mode converters.展开更多
In this paper,we study the propagation properties of surface plasmon polaritons in plasmonic single-cavity superlattices and two-cavity superlattices which are composed of two kinds of alternately stacked subwavelengt...In this paper,we study the propagation properties of surface plasmon polaritons in plasmonic single-cavity superlattices and two-cavity superlattices which are composed of two kinds of alternately stacked subwavelength metal-dielectric-air waveguides with large dispersion.Theoretical predictions of plasmonic time-resolved Bloch oscillations existing in single-cavity superlat-tices and resonant Zener tunneling（ZT） occurring in two-cavity superlattices by the transfer matrix method（TMM） are well dem-onstrated by the numerical simulations on the propagation of SPPs pulse in the two kinds of superlattices by the finite-difference time-domain（FDTD） method.The two proposed superlattices can be conveniently fabricated by present nanotechnology,and the study may promote the realization of plasmonic BO and resonant ZT in nanoscale devices experimentally.展开更多
基金Supported by the National Natural Science Foundation of China and the Foundation of State Education Commission.
文摘The dispersion characteristics of a circular dielectric waveguide with periodic metal-lic strips are analyzed by the Galerkin’s method.After obtaining the rigorous dispersion equation,the dispersion curves for both TE<sub>01</sub>and TM<sub>01</sub>modes are calculated by the improved Newton’smethod.The variations of the normalized center frequency,width and maximum attenuation con-stant of the stopband with the normalized width of the metallic strips are given.The convergenceproperties of numerical solutions are also discussed.On the basis of the analysis,some usefulguidelines for filter design are thereby suggested.
文摘Dielectric rod arrays in a metallic waveguide alter the propagation modes and group velocities of electromagnetic waves. We focus on TE10-to-TE20 mode converters and investigate the variation in their behavior with frequency. In this investigation, a mode converter is proposed that passes the TE10 mode at frequencies lower than 2fc, and converts the TE10 mode into the TE40 mode for frequencies higher than 2fc, which is achieved by a combination of TE10-TE20 mode converters.
基金Supported by the Fundamental Research Funds for the Central Universities (1082007)the National Science Fund for Talent Training in Basic Science (J0830310)the Open Experiments Funds of Wuhan University
文摘In this paper,we study the propagation properties of surface plasmon polaritons in plasmonic single-cavity superlattices and two-cavity superlattices which are composed of two kinds of alternately stacked subwavelength metal-dielectric-air waveguides with large dispersion.Theoretical predictions of plasmonic time-resolved Bloch oscillations existing in single-cavity superlat-tices and resonant Zener tunneling（ZT） occurring in two-cavity superlattices by the transfer matrix method（TMM） are well dem-onstrated by the numerical simulations on the propagation of SPPs pulse in the two kinds of superlattices by the finite-difference time-domain（FDTD） method.The two proposed superlattices can be conveniently fabricated by present nanotechnology,and the study may promote the realization of plasmonic BO and resonant ZT in nanoscale devices experimentally.
