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Tradeoff between mode confinement, loss, and cross-talk, for dielectric and metal slot waveguides
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
2009 (English)In: Photonics Letters of Poland, ISSN 2080-2242, Vol. 1, 172-174 p.Article in journal (Refereed) Published
Abstract [en]

Slot waveguides formed in high-index dielectrics or metals provide strong field enhancement in the slot region. When filled with nonlinear or lasing materials, they have the potential for highly efficient components for intensity dependent signal processing in integrated photonic circuits. In view of the increasing demand for high integration, metal slot waveguides have the great advantage of sub-diffraction mode confinement but they suffer from serious transmission loss. The total lateral field extent in their low-loss dielectric counterparts is, in turn, diffraction limited. Considering those tradeoffs, we show that at 24dB/ÎŒm cross-talk and the attenuation length of at least 5ÎŒm, gold slot waveguides can be spaced only ca 3.5 times denser than slot waveguides in silicon.

Place, publisher, year, edition, pages
2009. Vol. 1, 172-174 p.
Keyword [en]
Attenuation lengths; Diffraction limited; High-index; Integrated photonic circuit; Intensity-dependent; Lasing materials; Low loss; Slot waveguide; Strong field enhancement; Sub-diffraction; Transmission loss, Crosstalk; Dielectric materials; Diffraction; Signal processing, Waveguides
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-33995DOI: 10.4302/plp.2009.4.10Scopus ID: 2-s2.0-78651569548OAI: oai:DiVA.org:kth-33995DiVA: diva2:418438
Note
QC 20110523Available from: 2011-05-23 Created: 2011-05-23 Last updated: 2011-05-23Bibliographically 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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