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Conference Paper: Universal Eigenvalue Analysis for 2D Periodic Plasmonic Nanostructures

TitleUniversal Eigenvalue Analysis for 2D Periodic Plasmonic Nanostructures
Authors
Issue Date2014
PublisherElectromagnetics Academy. The Journal's web site is located at http://www.piers.org/piersproceedings/
Citation
The 35th Progress in Electromagnetics Research Symposium (PIERS), Guangzhou, China, 25-28 August 2014. In the Abstracts of the 35th Progress in Electromagnetics Research Symposium (PIERS), 2014, p. 464 How to Cite?
AbstractWe developed a universal eigenvalue analysis for 2D arbitrary nanostructures com- prising dispersive and lossy materials. The complex Bloch band structures (BS) of plasmonic crystals and gratings are rigorously calculated by the ¯nite-di®erence discretization of wave equa- tion. Given a frequency of interest, the eigenvalue algorithm solves one Bloch wavenumber as the eigenvalue via ¯xing another. (1) For plasmonic crystals, the in°uence of ohmic (metallic) loss on the complex BS and eigenmodes is investigated. Regarding a TE polarization with Hz ¯eld, the ohmic loss strongly a®ects the BS and eigenmodes at plasmonic resonance frequencies. Both the fast oscillation of dispersion curve and strong ¯eld con¯nement of eigenmodes are damped due to the high ohmic loss. Regarding a TM polarization with Ez ¯eld, the introduction of ohmic loss twists the vertical dispersion curve at the bandgap and breaks the symmetry of eigenmodes. Regarding both polarizations, the high ohmic loss lowers the quality factor of eigenmodes. (2) For plasmonic gratings, the abnormally large group velocity is observed at a plasmonic band edge with a large attenuation constant. Interestingly, we found the abnormal group velocity is caused by the leaky (radiation) loss, not by metallic absorption (ohmic) loss. The periodically modulated surface of the grating signi¯cantly modi¯es the original BS of the semi-in¯nite dielectric-metal structure and induces the extraordinarily large group velocity, which is di®erent from the near- zero group velocity at photonic band edge. The work is fundamentally important to the design of plasmonic nanostructures .....
Persistent Identifierhttp://hdl.handle.net/10722/204095
ISSN

 

DC FieldValueLanguage
dc.contributor.authorSha, Wen_US
dc.contributor.authorWang, Hen_US
dc.contributor.authorChoy, WCHen_US
dc.contributor.authorChew, WCen_US
dc.date.accessioned2014-09-19T20:05:06Z-
dc.date.available2014-09-19T20:05:06Z-
dc.date.issued2014en_US
dc.identifier.citationThe 35th Progress in Electromagnetics Research Symposium (PIERS), Guangzhou, China, 25-28 August 2014. In the Abstracts of the 35th Progress in Electromagnetics Research Symposium (PIERS), 2014, p. 464en_US
dc.identifier.issn1559-9450-
dc.identifier.urihttp://hdl.handle.net/10722/204095-
dc.description.abstractWe developed a universal eigenvalue analysis for 2D arbitrary nanostructures com- prising dispersive and lossy materials. The complex Bloch band structures (BS) of plasmonic crystals and gratings are rigorously calculated by the ¯nite-di®erence discretization of wave equa- tion. Given a frequency of interest, the eigenvalue algorithm solves one Bloch wavenumber as the eigenvalue via ¯xing another. (1) For plasmonic crystals, the in°uence of ohmic (metallic) loss on the complex BS and eigenmodes is investigated. Regarding a TE polarization with Hz ¯eld, the ohmic loss strongly a®ects the BS and eigenmodes at plasmonic resonance frequencies. Both the fast oscillation of dispersion curve and strong ¯eld con¯nement of eigenmodes are damped due to the high ohmic loss. Regarding a TM polarization with Ez ¯eld, the introduction of ohmic loss twists the vertical dispersion curve at the bandgap and breaks the symmetry of eigenmodes. Regarding both polarizations, the high ohmic loss lowers the quality factor of eigenmodes. (2) For plasmonic gratings, the abnormally large group velocity is observed at a plasmonic band edge with a large attenuation constant. Interestingly, we found the abnormal group velocity is caused by the leaky (radiation) loss, not by metallic absorption (ohmic) loss. The periodically modulated surface of the grating signi¯cantly modi¯es the original BS of the semi-in¯nite dielectric-metal structure and induces the extraordinarily large group velocity, which is di®erent from the near- zero group velocity at photonic band edge. The work is fundamentally important to the design of plasmonic nanostructures .....-
dc.languageengen_US
dc.publisherElectromagnetics Academy. The Journal's web site is located at http://www.piers.org/piersproceedings/-
dc.relation.ispartofProgress in Electromagnetics Research Symposiumen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleUniversal Eigenvalue Analysis for 2D Periodic Plasmonic Nanostructuresen_US
dc.typeConference_Paperen_US
dc.identifier.emailSha, W: shawei@hku.hken_US
dc.identifier.emailWang, H: wangh327@hku.hken_US
dc.identifier.emailChoy, WCH: chchoy@eee.hku.hken_US
dc.identifier.emailChew, WC: wcchew@hku.hken_US
dc.identifier.authoritySha, W=rp01605en_US
dc.identifier.authorityChoy, WCH=rp00218en_US
dc.identifier.authorityChew, WC=rp00656en_US
dc.description.naturepublished_or_final_version-
dc.identifier.hkuros238972en_US
dc.identifier.spage464-
dc.identifier.epage464-
dc.publisher.placeUnited Statesen_US

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