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Reducing crosstalk between nanowire-based hybrid plasmonic waveguides
KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics.ORCID iD: 0000-0002-3368-9786
KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
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2011 (English)In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 284, no 1, 480-484 p.Article in journal (Refereed) Published
Abstract [en]

Hybrid plasmonic waveguides based on a surface oxidized dielectric nanowire placed on a metal surface can facilitate simultaneously deep subwavelength mode confinement and large propagation length. Directional coupling based on such waveguides are theoretically investigated. Much lower crosstalk is noticed for such hybrid plasmonic waveguides compared to conventional waveguides based on bare dielectric nanowires. Some modifications, such as vertically placing the metal surfaces or using a metallic block between the nanowires, are studied which can further reduce the crosstalk between two waveguides. The proposed low crosstalk structures based on hybrid plasmonic waveguides can provide a simple platform for plasmonic integration which can at the same time easily interface with traditional photonic circuits. (C) 2010 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2011. Vol. 284, no 1, 480-484 p.
Keyword [en]
Plasmonic waveguide, Nanowire, Mode confinement, Coupling length
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-30518DOI: 10.1016/j.optcom.2010.08.054ISI: 000285893200086Scopus ID: 2-s2.0-78649640323OAI: oai:DiVA.org:kth-30518DiVA: diva2:403939
Funder
Swedish Research Council
Note
QC 20110315Available from: 2011-03-15 Created: 2011-02-28 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Plasmonic waveguides and resonators for optical communication applications
Open this publication in new window or tab >>Plasmonic waveguides and resonators for optical communication applications
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Photonic circuits can transmit data signals in a much higher speed thanconventional electronic circuits. However, miniaturization of photonic circuitsand devices is hindered by the existence of light diffraction limit. A promisingsolution to this problem is by exploiting plasmonic systems for guiding andmanipulating signals at optical frequencies. Plasmonic devices are generallycomposed of noble metals and dielectrics, whose interfaces can confine surfaceplasmon polaritons, a hybrid wave that is free of diffraction limit. Plasmonicwaveguides and devices are serious contenders for achieving next-generationphotonic integrated circuits with a density comparable to the electronic counterpart.

This thesis addresses the design issues of passive plasmonic devices whichare critical for realization of photonic integration, including plasmonic waveguides,splitters, couplers, and resonators, investigated with both the finitedifferencetime-domain method and the finite-element method. In particularwe present, firstly, a coupler which efficiently couples light between a silicondielectric waveguide and a hybrid plasmonic (HP) waveguide. A coupling efficiencyas high as 70% is realized with a HP taper as short as 0.4μm. Theexperimental result agrees well with the numerical simulation. Secondly, wenumerically investigate and optimize the performances of 1×2 and 1×3 HPmultimode interferometers (MMIs), which split light from a silicon waveguideto multiple HP waveguides. Total transmission over 75% can be achieved inboth cases. Thirdly, we study the coupling and crosstalk issues in plasmonicwaveguide systems. Several methods for crosstalk reduction are proposed.Finally, HP nanodisk micro-cavities are designed and are numerically characterized.With a radius of 1μm, a high quality factor of 819 and a highPurcell factor of 1827 can be simultaneously achieved, which can be useful forrealizing efficient nano-lasers.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. xi, 60 p.
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2011:10
Keyword
Plasmonic
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-33596 (URN)978-91-7501-015-1 (ISBN)
Public defence
2011-06-07, sal C1, Electrum, Kungl Tekniska Högskolan,Isafjordsgatan 26, Kista, Stockholm, 14:13 (English)
Opponent
Supervisors
Note
QC 20110523Available from: 2011-05-23 Created: 2011-05-11 Last updated: 2011-05-23Bibliographically approved

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