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Article: Observing Abnormally Large Group Velocity at the Plasmonic Band Edge via a Universal Eigenvalue Analysis

TitleObserving Abnormally Large Group Velocity at the Plasmonic Band Edge via a Universal Eigenvalue Analysis
Authors
Issue Date2014
Citation
Optics Letters, 2014, v. 39, p. 158-161 How to Cite?
AbstractWe developed a novel universal eigenvalue analysis for 2D arbitrary nanostructures comprising dispersive and lossy materials. The complex dispersion relation (or complex Bloch band structure) of a metallic grating is rigorously calculated by the proposed algorithm with the finite-difference implementation. 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 significantly modifies the original dispersion relation of the semi-infinite dielectric-metal structure and induces the extraordinarily large group velocity, which is different 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/10722/202883

 

DC FieldValueLanguage
dc.contributor.authorSha, Wen_US
dc.contributor.authorMeng, Len_US
dc.contributor.authorChoy, WCHen_US
dc.contributor.authorChew, WCen_US
dc.date.accessioned2014-09-19T10:09:14Z-
dc.date.available2014-09-19T10:09:14Z-
dc.date.issued2014en_US
dc.identifier.citationOptics Letters, 2014, v. 39, p. 158-161en_US
dc.identifier.urihttp://hdl.handle.net/10722/202883-
dc.description.abstractWe developed a novel universal eigenvalue analysis for 2D arbitrary nanostructures comprising dispersive and lossy materials. The complex dispersion relation (or complex Bloch band structure) of a metallic grating is rigorously calculated by the proposed algorithm with the finite-difference implementation. 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 significantly modifies the original dispersion relation of the semi-infinite dielectric-metal structure and induces the extraordinarily large group velocity, which is different from the near-zero group velocity at photonic band edge. The work is fundamentally important to the design of plasmonic nanostructures.en_US
dc.languageengen_US
dc.relation.ispartofOptics Lettersen_US
dc.titleObserving Abnormally Large Group Velocity at the Plasmonic Band Edge via a Universal Eigenvalue Analysisen_US
dc.typeArticleen_US
dc.identifier.emailSha, W: shawei@hku.hken_US
dc.identifier.emailMeng, L: llmeng@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.identifier.doi10.1364/OL.39.000158-
dc.identifier.hkuros238579en_US
dc.identifier.hkuros250911-
dc.identifier.volume39en_US
dc.identifier.spage158en_US
dc.identifier.epage161en_US

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