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Fiber-Coupled Surface Plasmon Polariton Excitation in Imprinted Dielectric-Loaded Waveguides  [PDF]
Andreas Seidel,Jacek Gosciniak,Maria U. Gonzalez,Jan Renger,Carsten Reinhardt,Roman Kiyan,Romain Quidant,Sergey I. Bozhevolnyi,Boris N. Chichkov
International Journal of Optics , 2010, DOI: 10.1155/2010/897829
Abstract: We present fiber-coupled dielectric-loaded plasmonic waveguides for 1.55? m telecom wavelength fabricated by two-photon polymerization and nanoimprint lithography. The waveguide structures include 100- m-long plasmonic waveguides connected on both ends to tapered dielectric waveguides used for end-fire coupling with optical fibers. The excitation of plasmonic waveguides is verified via polarization-resolved measurements of the overall transmission, demonstrating thereby that this technology is suitable in principle for the integration of plasmonic components into fiberoptics. Loss mechanisms are investigated and improvements suggested to reduce transmission losses and consequently increase the viability of practical application. 1. Introduction Photonic components utilizing surface plasmon polariton (SPP) modes supported by various metal-dielectric configurations have been attracting a great deal of attention, because of promising applications in sensing and on-chip data transmission [1–3] and the advantage of utilizing the same metallic circuitry for both guiding the radiation and controlling its guidance [4]. An important aspect, however, is compatibility between different configurations. Most optical systems and optical data transmission networks are fiber-based, so it is particularly important to provide the ability to interconnect plasmonic waveguides and optical fibers for integration purposes. In this paper, we present plasmonic-optical hybrid waveguides fabricated by nanoimprint lithography from master structures made by two-photon polymerization technique. The plasmonic waveguides are interconnected with tapered dielectric waveguides suitable for end-fire coupling with optical fibers. The layout of the structures is derived from a previous design that has been studied in some detail [5, 6], but was not suited to a fiber-based environment due to the impossibility of approaching the structures with a fiber close enough for coupling. This has been remedied by the inclusion of optical waveguides in the design that can be coupled to optical fibers (Figure 1(a)). Figure 1: (a) A schema showing the layout of a sample with plasmonic waveguides. The waveguides consist of optical waveguides at either end which taper down to a 100?micrometer long plasmonic waveguide only 600?nm wide. (b) SEM image of the DLSPPW section. (c) SEM image of the optical waveguide section. The substrate used is a quartz glass slab measuring ?mm. The refractive index of the glass is 1.44 at a wavelength of 1.55? m. In the center of the glass slab, there is a longitudinal gold
Enhanced surface plasmon polariton propagation induced by active dielectrics  [PDF]
C. Athanasopoulos,M. Mattheakis,G. P. Tsironis
Physics , 2013,
Abstract: We present numerical simulations for the propagation of surface plasmon polaritons in a dielectric-metal-dielectric waveguide using COMSOL multiphysics software. We show that the use of an active dielectric with gain that compensates metal absorption losses enhances substantially plasmon propagation. Furthermore, the introduction of the active material induces, for a specific gain value, a root in the imaginary part of the propagation constant leading to infinite propagation of the surface plasmon. The computational approaches analyzed in this work can be used to define and tune the optimal conditions for surface plasmon polariton amplification and propagation.
Modulation of a surface plasmon-polariton resonance by sub-terahertz diffracted coherent phonons  [PDF]
Christian Brüggemann,Andrey V. Akimov,Boris A. Glavin,Vladimir I. Belotelov,Ilya A. Akimov,Jasmin J?ger,Sachin Kasture,Achanta Venu Gopal,Arvind S. Vengurlekar,Dmitri R. Yakovlev,Anthony J. Kent,Manfred Bayer
Physics , 2012, DOI: 10.1103/PhysRevB.86.121401
Abstract: Coherent sub-THz phonons incident on a gold grating that is deposited on a dielectric substrate undergo diffraction and thereby induce an alteration of the surface plasmon-polariton resonance. This results in efficient high-frequency modulation (up to 110 GHz) of the structure's reflectivity for visible light in the vicinity of the plasmon-polariton resonance. High modulation efficiency is achieved by designing a periodic nanostructure which provides both plasmon-polariton and phonon resonances. Our theoretical analysis shows that the dynamical alteration of the plasmon-polariton resonance is governed by modulation of the slit widths within the grating at the frequencies of higher-order phonon resonances.
Surface plasmon-polariton resonance at diffraction of THz radiation on semiconductor gratings  [PDF]
I. S. Spevak,M. Tymchenko,V. K. Gavrikov,V. M. Shulga,J. Feng,H. B. Sun,Yu. E. Kamenev,A. V. Kats
Physics , 2013,
Abstract: Resonance diffraction of THz HCN laser radiation on a semiconductor (InSb) grating is studied both experimentally and theoretically. The specular reflectivity suppression due to the resonance excitation of the THz surface plasmon-polariton is observed on a pure semiconductor grating and on semiconductor gratings covered with a thin striped layer of the residual photoresist. Presence of a thin dielectric layer on the grating surface leads to the shift and widening of the plasmon-polariton resonance. A simple analytical theory of the resonance diffraction on a shallow grating covered with a dielectric layer is presented. Its results are in a good accordance with the experimental data. Analytical expressions for the resonance shift and broadening can be useful for sensing data interpretation.
Experimental Investigation of Surface Plasmon Resonance Using Tapered Cylindrical Light Guides with Metal-Dielectric Interface  [PDF]
Sharmila Ghosh, Kaushik Brahmachari, Mina Ray
Journal of Sensor Technology (JST) , 2012, DOI: 10.4236/jst.2012.21007
Abstract: In this paper we report an experimental investigation on the observation of surface plasmon resonance at the metal- dielectric interface of silver coated tapered light guiding glass rods of different dimensions. Chemical deposition technique has been used for metallic deposition of silver on the Tapered glass rod. Angular interrogation in Kretschmann- like configuration of this non-planar (cylindrical) structure is used to locate the resonance dip in the reflectance mea- surement. Fabrication simplicity, in addition to the inherent advantage of using different types of tapered structures, makes this study important in the development of nanoplasmonics. The experimental study is accompanied by some interesting results.
On surface plasmon polariton wavepacket dynamics in metal-dielectric heterostructures  [PDF]
V. I. Belotelov,D. A. Bykov,L. L. Doskolovich,A. K. Zvezdin
Physics , 2010, DOI: 10.1088/0953-8984/22/39/395301
Abstract: The WKB equations for dynamics of the surface plasmon polariton (SPP) wavepacket are studied. The dispersion law for the SPP in the metal-dielectric heterostructure with varying thickness of a perforated dielectric layer is rigorously calculated and investigated using the scattering matrix method. Two channels of the SPP wavepacket optical losses related to the absorption in a metal and to the SPP leakage are analyzed. It is shown that change of the dielectric layer thickness acts on the SPP as an external force leading to evolution of its quasimomentum and to the wavepacket reversal or even to the optical Bloch oscillations (BO). Properties of these phenomena are investigated and discussed. Typical values of the BO amplitude are about tens of microns and the period is around tens or hundreds of femtoseconds.
Gap plasmon polariton structure for very efficient micro to nano scale interfacing  [PDF]
Pavel Ginzburg,David Arbel,Meir Orenstein
Physics , 2006, DOI: 10.1364/OL.31.003288
Abstract: The seamless transition between micro-scale photonics and nano-scale plasmonics requires the mitigation between different waveguiding mechanisms as well as between few orders of magnitude in the field lateral size, down to a small fraction of a wavelength. By exploiting gap plasmon polariton waves both at the micro and nano scale, very high power transfer efficiency (>60%) can be achieved using an ultrashort (few microns) non adiabatic tapered gap plasmon waveguide. Same mechanism may be used to harvest impinging light waves and direct them into a nano hole or slit, to exhibit an anomalous transmission - without the conventional periodic structures. The special interplay of plasmonic and oscillating modes is analyzed.
Near dispersion-less surface plasmon polariton resonances at a metal-dielectric interface  [PDF]
Sachin Kasture,P. Mandal,Amandev Singh,Andrew Ramsay,Arvind S. Vengurlekar,S. Dutta Gupta,V. I. Belotelov,Achanta Venu Gopal
Physics , 2011, DOI: 10.1063/1.4749277
Abstract: Omni-directional light coupling to surface plasmon polariton (SPP) modes to make use of plasmon mediated near-field enhancement is challenging. We report possibility of near dispersion-less modes in structures with unpatterned metal-dielectric interfaces having 2-D dielectric patterns on top. We show that the position and dispersion of the excited modes can be controlled by the excitation geometry and the 2-D pattern. The anti-crossings resulting from the in-plane coupling of different SPP modes are also shown.
Kinetic theory of surface plasmon polariton in semiconductor nanowires  [PDF]
Y. Yin,M. W. Wu
Physics , 2012, DOI: 10.1103/PhysRevB.87.165412
Abstract: Based on the semiclassical model Hamiltonian of the surface plasmon polariton and the nonequilibrium Green-function approach, we present a microscopic kinetic theory to study the influence of the electron scattering on the dynamics of the surface plasmon polariton in semiconductor nanowires. The damping of the surface plasmon polariton originates from the resonant absorption by the electrons (Landau damping), and the corresponding damping exhibits size-dependent oscillations and distinct temperature dependence without any scattering. The scattering influences the damping by introducing a broadening and a shifting to the resonance. To demonstrate this, we investigate the damping of the surface plasmon polariton in InAs nanowires in the presence of the electron-impurity, electron-phonon and electron-electron Coulomb scatterings. The main effect of the electron-impurity and electron-phonon scatterings is to introduce a broadening, whereas the electron-electron Coulomb scattering can not only cause a broadening, but also introduce a shifting to the resonance. For InAs nanowires under investigation, the broadening due to the electron-phonon scattering dominates. As a result, the scattering has a pronounced influence on the damping of the surface plasmon polariton: The size-dependent oscillations are smeared out and the temperature dependence is also suppressed in the presence of the scattering. These results demonstrate the the important role of the scattering on the surface plasmon polariton damping in semiconductor nanowires.
Evolution of surface-plasmon-polariton and Dyakonov-Tamm waves with the ambichirality of a partnering dielectric material  [PDF]
Muhammad Faryad,Akhlesh Lakhtakia
Physics , 2014, DOI: 10.1117/1.JNP.8.083082
Abstract: The planar interface of an isotropic homogeneous metal and an ambichiral dielectric material can guide surface-plasmon-polariton waves. The planar interface of an isotropic, homogeneous dielectric material and an ambichiral dielectric material can guide Dyakonov-Tamm waves. In either instance, we found that, as the ambichiral partnering material evolves into a finely chiral material, the solutions of the dispersion equation for surface-wave propagation evince convergence. The convergence is faster for the surface waves with larger phase speeds than for the surface waves with smaller phase speeds.
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