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Plasmonic waveguides and resonators for optical communication applications
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics. (Nanophotonics)
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 [en]
Plasmonic
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-33596ISBN: 978-91-7501-015-1OAI: oai:DiVA.org:kth-33596DiVA: diva2:416380
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
List of papers
1. Efficient coupling between dielectric and hybrid plasmonic waveguides by multimode interference power splitter
Open this publication in new window or tab >>Efficient coupling between dielectric and hybrid plasmonic waveguides by multimode interference power splitter
2011 (English)In: Journal of optics, ISSN 0150-536X, Vol. 13, no 7, 075002- p.Article in journal (Refereed) Published
Abstract [en]

Multimode interference power splitters based on hybrid plasmonic waveguides are investigated theoretically. Balanced power splitting is achieved in designed 1 × 3 and 1 × 2 power splitters between a silicon-on-insulator waveguide and several hybrid plasmonic waveguides, with total transmission efficiencies at 76.1% and 78.3% at the wavelength of 1550 nm, respectively.

Keyword
plasmonic waveguides, multimode interference, Gaussian source, misalignment
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-33876 (URN)10.1088/2040-8978/13/7/075002 (DOI)000294294100002 ()2-s2.0-79960041382 (ScopusID)
Funder
Swedish Research Council
Note

QC 20110520

Available from: 2011-05-20 Created: 2011-05-20 Last updated: 2012-08-23Bibliographically approved
2. Subwavelength hybrid plasmonic nanodisk with high Q factor and Purcell factor
Open this publication in new window or tab >>Subwavelength hybrid plasmonic nanodisk with high Q factor and Purcell factor
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.

Keyword
hybrid plasmonic nanodisk, Q factor, mode volume, Purcell factor
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-33877 (URN)10.1088/2040-8978/13/7/075001 (DOI)000294294100001 ()2-s2.0-79960068478 (ScopusID)
Funder
Swedish Research Council
Note

QC 20110520

Available from: 2011-05-20 Created: 2011-05-20 Last updated: 2012-08-23Bibliographically approved
3. Reducing crosstalk between nanowire-based hybrid plasmonic waveguides
Open this publication in new window or tab >>Reducing crosstalk between nanowire-based hybrid plasmonic waveguides
Show others...
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.

Keyword
Plasmonic waveguide, Nanowire, Mode confinement, Coupling length
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-30518 (URN)10.1016/j.optcom.2010.08.054 (DOI)000285893200086 ()2-s2.0-78649640323 (ScopusID)
Funder
Swedish Research Council
Note
QC 20110315Available from: 2011-03-15 Created: 2011-02-28 Last updated: 2012-02-23Bibliographically approved
4. Efficient coupler between silicon waveguide and hybrid plasmonic waveguide
Open this publication in new window or tab >>Efficient coupler between silicon waveguide and hybrid plasmonic waveguide
2011 (English)In: OPTOELECTRONIC MATERIALS AND DEVICES V / [ed] oyama, F; Chuang, SL; Duan, GH; Huang, Y, 2011, Vol. 7987Conference paper (Refereed)
Abstract [en]

We experimentally demonstrate an efficient coupler between a silicon waveguide and a hybrid plasmonic waveguide for the wavelength range 1460-1540 nm. Such compact, efficient plasmonic couplers provide a promising platform for integrated photonic circuits.

Series
, Proceedings of SPIE, ISSN 277-786X ; 7987
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-33881 (URN)10.1117/12.888661 (DOI)000292740900010 ()2-s2.0-79953012949 (ScopusID)
Conference
Conference on Optoelectronic Materials and Devices V. Shanghai, FL. DEC 08-12, 2010
Note
QC 20110523Available from: 2011-05-23 Created: 2011-05-20 Last updated: 2012-03-23Bibliographically approved
5. Broadband coupler between silicon waveguide and hybrid plasmonic waveguide
Open this publication in new window or tab >>Broadband coupler between silicon waveguide and hybrid plasmonic waveguide
Show others...
2010 (English)In: Optics Express, ISSN 1094-4087, Vol. 18, no 12, 13173-13179 p.Article in journal (Refereed) Published
Abstract [en]

Efficient broadband coupling of light between a dielectric waveguide and a hybrid plasmonic waveguide is investigated theoretically. A plasmonic linear taper is used as a coupler which connects the two types of waveguides. Broadband coupling is realized by such a compact plasmonic taper with a length of only 0.4 mu m, which achieves a coupling efficiency of 70% (1.5dB) at the 1.55 mu m telecommunication wavelength. (C) 2010 Optical Society of America

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-27321 (URN)000278527700120 ()2-s2.0-77953605680 (ScopusID)
Note
QC 20101209Available from: 2010-12-09 Created: 2010-12-09 Last updated: 2011-05-23Bibliographically approved
6. Asymmetric plasmonic-dielectric coupler with short coupling length, high extinction ratio, and low insertion loss
Open this publication in new window or tab >>Asymmetric plasmonic-dielectric coupler with short coupling length, high extinction ratio, and low insertion loss
Show others...
2010 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 35, no 19, 3153-3155 p.Article in journal (Refereed) Published
Abstract [en]

Asymmetric directional coupling between a hybrid plasmonic waveguide with subwavelength field confinement and a conventional dielectric waveguide is investigated. The proposed hybrid coupler features short coupling length, high coupling efficiency, high extinction ratio, and low insertion loss; it can also be integrated into a silicon-based platform. This coupler can be potentially adopted for signal routing between plasmonic waveguides and dielectric waveguides in photonic integrated circuits. Furthermore, it can be exploited to efficiently excite hybrid plasmonic modes with conventional dielectric modes.

Keyword
SLOT WAVE-GUIDE, SUBWAVELENGTH CONFINEMENT, SILICON
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-26293 (URN)000282374800001 ()2-s2.0-78149245628 (ScopusID)
Note
QC 20101229Available from: 2010-12-29 Created: 2010-11-21 Last updated: 2011-05-23Bibliographically approved
7. Tradeoff between mode confinement, loss, and cross-talk, for dielectric and metal slot waveguides
Open this publication in new window or tab >>Tradeoff between mode confinement, loss, and cross-talk, for dielectric and metal slot waveguides
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.

Keyword
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:nbn:se:kth:diva-33995 (URN)10.4302/plp.2009.4.10 (DOI)2-s2.0-78651569548 (ScopusID)
Note
QC 20110523Available from: 2011-05-23 Created: 2011-05-23 Last updated: 2011-05-23Bibliographically approved

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