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|Title:||Terahertz localized surface plasmon resonances in coaxial microcavities|
|Citation:||Advanced Optical Materials, 2013; 1(6):443-448|
|Publisher:||Wiley - V C H Verlag GmbH & Co. KGaA|
|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.|
localized surface plasmon resonances
|Rights:||© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim|
|Appears in Collections:||Aurora harvest|
Electrical and Electronic Engineering publications
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