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Friday, July 31, 2020 | History

2 edition of Ultra-compact contra-directional plasmonic coupler at optical frequencies. found in the catalog.

Ultra-compact contra-directional plasmonic coupler at optical frequencies.

Wang, Yan.

Ultra-compact contra-directional plasmonic coupler at optical frequencies.

by Wang, Yan.

  • 282 Want to read
  • 8 Currently reading

Published .
Written in English


About the Edition

The characteristics of a special type of guided wave, namely the surface plasmon-polariton (SPP), have been investigated. We focus on the backward wave propagation of SPPs in two specific plasmonic waveguides at optical frequencies. These plasmonic structures form a unique class of planar left-handed medium due to the single - epsilon material parameter. They are also able to achieve lateral confinement on the nanometer scale, which makes them attractive for nano-optics applications. Additionally, a contra-directional coupled-line coupler based on the guidance of SPPs has been proposed, designed and simulated. This coupler exhibits co-directional phase and contra-directional power flow in the two branches. The contra-directional coupled mode theory has also been derived to reveal the phenomenon of two eigenmodes with complex-conjugate propagation constants. This leads to a high coupling level, short coupling length, and high isolation. Finally, the effects of material losses and finite geometry have also been investigated.

The Physical Object
Pagination69 leaves.
Number of Pages69
ID Numbers
Open LibraryOL19551537M
ISBN 109780494211472

Nanooptics of Molecular-Shunted Plasmonic NanojunctionsCited by: The asymmetry parameter q as a measure of the coupling in SEIRA depends on the oscillator strength of the narrow vibrational excitation and on that of the plasmonic continuum at the same frequency and thus on the spectral tuning ω vib /ω res between the vibrational and the plasmonic excitation. The coupling parameter q and SEIRA line shape.

Plasmonic waveguides have been widely studied to design plasmonic photodetectors for UV to the NIR spectral range (Konstantatos and Sargent, , Liu et al., , Butun et al., ). Replacing the insulator region of a plasmonic waveguide with a semiconductor medium (e.g., inorganic or polymer) is the main method to design photodetectors. Due to its strong nonlinear susceptibility tensor components, zinc oxide (ZnO) provides highly efficient frequency conversion when excited with near-infrared pulses. Three-photon absorption offers an alternative to conventional ultraviolet sources for sub-bandgap excitation of ZnO. In this work, plasmonic nanoantennas are used to enhance coupling of infrared light into photonic Cited by: 2.

Couplers. A fiber optic coupler is a device used in optical fiber systems with one or more input fibers and one or several output fibers. Light entering an input fiber can appear at one or more outputs and its power distribution potentially depending on the wavelength and couplers can be fabricated in different ways, for example by thermally fusing fibers so that .   Optical nano/microcavities are nano/microstructures that confine light for extended periods of time, resulting in optical resonances that can exhibit very narrow linewidths and high quality factors (i.e. Q-factors).The quality factor can be plainly expressed as Q=ω Res τ where ω Res is the resonant angular frequency and τ is the ring-down lifetime.. Sensors that use Cited by:


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Ultra-compact contra-directional plasmonic coupler at optical frequencies by Wang, Yan. Download PDF EPUB FB2

A novel power splitter based on coupled surface plasmons (SPs) is proposed for optical frequency applications. This power divider is an ultra-compact forward or co-directional coupling device. A nano-scaled coupled-line coupler based on the guidance of surface plasmon-polaritons (SPPs) is proposed, designed and simulated at optical frequencies.

The coupler comprises layered dielectric materials and silver, which serve as two stacked nano-transmission lines to achieve broadside coupling. The key property of this coupler is that it operates based on the principle. The nanoantenna coupler provides a compact interface between an optical fiber and a plasmonic slot waveguide for future optical integrated circuits.

View Show abstract. The proposed vertical coupler shows more efficient light coupling between a dielectric and plasmonic waveguide in comparison to the other types of hybrid coupler.

demonstration of ultra-compact directional couplers based on silicon hybrid plasmonic waveguides,” Appl. Phys. Lett., vol. no. 24, pp. –, [7] Y.-P. Chiou and C.-H. Du, “Arbitrary-order full-vectorial interface condi-tions and higher-order finite-difference analysis of optical waveguides,”.

Composite metal-dielectric-metal (MDM) surface plasmon polariton (SPP) structures are first proposed to realize the ultra-short optical splitters with simplified designs. The operation mechanism is based on the contra-directional coupling achieved in composite plasmonic slot waveguides.

In certain cases, the switching function can also be realized. At optical frequency, corresponding coupling length is just μm, this is an extremely small coupling length than previously reported by others. With modification in symmetric directional couplers designs and by providing a slow-light region, maximum normalized output waveguide power has been obtained equal to μw at s = by: 1.

Principle. The schematic of the proposed graphene-plasmon hybrid photodetector is shown in Figure 1A, where the light from a fiber is first coupled to a silicon waveguide through a grating coupler [] and further to the plasmonic slot waveguide by a short tapered structure [], [].The plasmonic slot waveguide (see the cross-section of the device in Figure 1C) consists of two Author: Yunhong Ding.

Ultrafast optical control of plasmon provides a potential route towards novel high-speed active photonic devices 1,2,3,4,5,6,7,8,9,10,11,For this reason, considerable efforts have been devoted Cited by: Here, we report a compact high-performance electro-optic (E-O) plasmonic switch constructed in a directional coupler like structure, including a plasmonic waveguide and an optical.

Schematic of a coupler to interface silicon slab waveguide with hybrid dielectric-loaded plasmonic waveguide (HDLPW). Coupler configuration with a taper along the width: (a) xy plane and (b) xz plane.

Region ‘1’, ‘2’ and ‘3’ signifies silicon slab waveguide, coupler and HDLPW respectively. The HDLPW starts from a plane at x= by:   We propose and investigate the performance of the plasmonic directional couplers based on two dimensional multi-slit plasmonic waveguides, employing the finite difference time domain simulation method.

The idea behind the directional properties of the directional couplers is the interference of two wave components, in and out of phase, at the Cited by: 6. Ultra-fast all-optical plasmonic switching in telecom wavelength realized.

and 1/ τ ω is the waveguide coupling loss. At the resonance frequency In this paper, an all-optical plasmonic switch based on metal–insulator–metal (MIM) nanoplasmonic waveguide with a Kerr nonlinear ring resonator is introduced and investigated.

Cited by: We propose a novel broadband coupler for silicon photonics using a hybrid plasmonic waveguide section. The hybrid plasmonic waveguide is used to create an asymmetric section in the middle of a silicon nanowire waveguide coupler to introduce a phase delay to allow for a 3-dB power coupling ratio over a nm bandwidth around µm.

The device is very compact. Abstract. We describe in this chapter development of plasmonic optical antennas for light concentration and near-field enhancement.

A set of bow tie nanoantennas are fabricated and characterized with optical and electron excitation by: 2. The schematic of the proposed graphene-plasmon hybrid photodetector is shown in Figure 1A, where the light from a fiber is first coupled to a silicon waveguide through a grating coupler [] and further to the plasmonic slot waveguide by a short tapered structure [], [].The plasmonic slot waveguide (see the cross-section of the device in Figure 1C) consists of two Cited by: 8.

A liquid-crystal tunable plasmonic optical switch based on a long-range metal stripe directional coupler is proposed and theoretically investigated. Extensive electro-optic tuning of the coupler’s characteristics is demonstrated by introducing a nematic liquid crystal layer above two coplanar plasmonic waveguides.

The switching properties of the proposed plasmonic structure are. Hybrid plasmonic waveguides and directional couplers have been experimentally demonstrated.

Using a direct measurement method, the propagation loss of a nm wide waveguide is measured to be dB/μm at nm when the thickness of low-index region is 56 nm. Ultra-compact directional couplers based on such hybrid plasmonic waveguides are Cited by: and output, for example for coupling to pairs of fibres (which have a large core-to-core separation due to their cladding).

Integrated optic directional couplers in semiconducting crystals require a rather different electrode construction, which will again be covered in Chapter Figure Plan view of a directional coupler switch.

The coupling losses of the in-house fabricated GCs which were used to couple light from the fiber to a Si waveguide were tested to be dB. Furthermore, the Si waveguide to plasmonic slot waveguide coupling scheme was not ideal either and led to another dB loss so that the fiber-to-plasmonic detector losses were about 21 by:.

AbstractSurface plasmons excited by light in metal structures provide a means for manipulating optical energy at the nanoscale. Plasmons are associated with the collective oscillations of conduction electrons in metals and play a role intermediate between photonics and electronics.

As such, plasmonic devices have been created that mimic photonic waveguides Cited by: nanowire waveguide coupler to introduce a phase delay to allow for a 3-dB power coupling ratio over a nm bandwidth around µm. The device is very compact (Optical Society of America OCIS codes: () Integrated optics devices; () Surface plasmons.

References and.This book provides an in-depth treatment of both linear fiber-optic systems and their key enabling devices.

It presents a concise but rigorous treatment of the theory and practice of analog (linear) fiber-optics links and systems that constitute the foundation of Hybrid Fiber Coax infrastructure in present-day CATV distribution and cable modem Internet : Kam Y. Lau.