Transmittance and surface intensity in 3D composite plasmonic waveguides

Abstract

A detailed theoretical study of composite plasmonic waveguide structures is reported. Expressions for modal expansion coefficients, optical transmittance and surface intensity are presented and used to describe the behavior of dielectric channel waveguides containing a short gold-coated section. The superstrate refractive index is shown to control modal beating and modal attenuation in the gold-coated region leading to distinctive features in the surface intensity and device transmittance. The model presented allows detailed prediction of device performance, enabling improved design of highly sensitive miniature devices for evanescent refractometry and vibrational spectroscopy, and can be extended to the design and optimization of composite waveguides structures with nano-patterned overlayers. 14. J. Shibayama, "Three-Dimensional numerical investigation of an improved surface plasmon resonance waveguide sensor," IEEE Photon. Technol. Lett. 22(9), 643-645 (2010). 15. J.Čtyroký, J. Homola, and M. Skalsky, "Modelling of surface plasmon resonance waveguide sensor by complex mode expansion and propagation method," Opt.

Invisibility Cloaking Scheme by Evanescent Fields Distortion on Composite Plasmonic Waveguides with Si Nano-Spacer

“…Our theoretical analysis is based on the semi-analytical model of orthonormalization of complex eigenmodes at an abrupt step, developed for the investigation of the transmission and surface intensity in composite plasmonic waveguide structures 19 . Briefly, the monochromatic plane wave with λ 0 illuminates the waveguide endfacet and excites the fundamental guided mode E i 0 .…”

“…Composite plasmonic waveguides 19 incorporating dielectric and metallic films such as in ref. 19 , offer great potential for ultra-compact integrated photonic devices due to substantial increase of the propagation distance of the plasmon waves.…”

“…Composite plasmonic waveguides 19 incorporating dielectric and metallic films such as in ref. 19 , offer great potential for ultra-compact integrated photonic devices due to substantial increase of the propagation distance of the plasmon waves. Surface plasmons 20 , 21 (SP) are a type of a surface waves extending along a metal-dielectric interface considering the momentum matching conditions.…”

“…One of the major limitations in the implementation of plasmonic circuits is their short propagation length. Composite plasmonic waveguides 19 provide large confinement of light in sub-wavelength scale. They also allow for the control of the surface plasmons excited in the metal overlayer while substantially reducing inevitable ohmic losses of conventional plasmonic materials.…”

Differential extinction of vibrational molecular overtone transitions with gold nanorods and its role in surface enhanced near-IR absorption (SENIRA)

“…Here we explore for the first time the mechanism of local field enhancement in molecular overtones. The local field enhancement can be realized with plasmonic materials by means of collective oscillations of free electrons in form of extended surface plasmonpolariton (SPP) in thin metal films [6][7][8][9][10][11] or localized surface plasmon resonance (LSPR) in plasmonic nanoantennas. [12][13][14][15] Enhancement and localization of electromagnetic fields in the close proximity of nanoantennas depend on their material, size, shape and the surrounding media.…”