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Subwavelength hybrid plasmonic nanodisk with high Q factor and Purcell factor
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.ORCID iD: 0000-0002-3368-9786
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
2011 (English)In: Journal of optics, ISSN 0150-536X, Vol. 13, no 7, 075001- p.Article in journal (Refereed) Published
Abstract [en]

Optical nanodisk resonators based on a hybrid plasmonic waveguiding geometry areinvestigated theoretically in the wavelength range of 1200–2000 nm with their radii varyingfrom 320 to 1000 nm. Due to the fact that a hybrid plasmonic structure can efficiently confinelight in a deep-subwavelength mode volume with a relatively low propagation loss, thenanodisks designed exhibit simultaneously a high Q factor and a high Purcell factor. For ahybrid plasmonic nanodisk with the radius of 1000 nm, a Q factor of 819 and a Purcell factor of1827 are achieved at the telecommunication wavelength of 1558 nm.

Place, publisher, year, edition, pages
2011. Vol. 13, no 7, 075001- p.
Keyword [en]
hybrid plasmonic nanodisk, Q factor, mode volume, Purcell factor
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-33877DOI: 10.1088/2040-8978/13/7/075001ISI: 000294294100001Scopus ID: 2-s2.0-79960068478OAI: oai:DiVA.org:kth-33877DiVA: diva2:418270
Funder
Swedish Research Council
Note

QC 20110520

Available from: 2011-05-20 Created: 2011-05-20 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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