Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/81613
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Type: Journal article
Title: Terahertz localized surface plasmon resonances in coaxial microcavities
Author: Withayachumnankul, W.
Shah, C.
Fumeaux, C.
Kaltenecker, K.
Walther, M.
Fischer, B.
Abbott, D.
Bhaskaran, M.
Sriram, S.
Citation: Advanced Optical Materials, 2013; 1(6):443-448
Publisher: Wiley - V C H Verlag GmbH & Co. KGaA
Issue Date: 2013
ISSN: 2195-1071
2195-1071
Statement of
Responsibility: 
Withawat Withayachumnankul, Charan Manish Shah, Christophe Fumeaux, Korbinian Kaltenecker, Markus Walther, Bernd M. Fischer, Derek Abbott, Madhu Bhaskaran, and Sharath Sriram
Abstract: Coaxial microcavities etched into the surface of a doped silicon substrate are shown to support localized surface plasmon resonances at terahertz frequencies. The underlying mechanism involves coupling freely propagating terahertz waves with surface plasmon polaritons (SPPs), which propagate in a coaxial mode along the cavity walls in the axial direction. A Fabry-Pérot resonance is built up when the SPP wavenumber appropriately relates to the cavity depth. Owing to the Ohmic loss of the silicon at terahertz frequencies, the energy of the resonating SPPs is largely dissipated, leading to a modified reflection spectrum. Strong field enhancement is observed inside the cavities at resonance. The theoretical analysis is supported by numerical and experimental results. This study is a promising pathway for development of terahertz devices with applications in the areas of photonic integrated circuits, molecular sensing, and subwavelength imaging. Coaxial microcavities etched into the surface of a doped silicon substrate are shown to support localized surface plasmon resonances at terahertz frequencies. This provides a promising pathway for the development of terahertz devices with application in the areas of photonic integrated circuits, molecular sensing, and subwavelength imaging. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Keywords: plasmonics
localized surface plasmon resonances
terahertz waves
metamaterials
coaxial cavities
Rights: © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
DOI: 10.1002/adom.201300021
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Electrical and Electronic Engineering publications

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