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Active Control of Surface Plasmon Waveguides with a Phase Change Material

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hdl:2117/76509

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Rudé, Miquel
Simpson, Robert E.
Quidant, Romain
Pruneri, Valerio
Renger, Jan
Document typeArticle
Defense date2015-05-25
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
This work is protected by the corresponding intellectual and industrial property rights. Except where otherwise noted, its contents are licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
ProjectPLASMOLIGHT - NEW FRONTIERS IN PLASMON OPTICS: FROM NANOCHEMISTRY TO QUANTUM OPTICS (EC-FP7-259196)
Abstract
The ability to manipulate light propagation at the nanoscale is of vital importance for future integrated photonic circuits. In this work we exploit the high contrast in the optical properties of the phase change material Ge2Sb2Te5 to control the propagation of surface plasmon polaritons at a Au/SiO2 interface. Using grating couplers, normally incident light at λ = 1.55 μm is converted into propagating surface plasmons on a Au waveguide. Single laser pulses (λ = 975 nm) are applied to a thin film of Ge2Sb2Te5 placed on top of the device, which, upon transition from its amorphous to crystalline structural phase, dramatically increases both its refractive index and absorption coefficient, thus inhibiting propagation of the plasmonic mode. This effect is investigated for different interaction lengths between the phase change material and the Au waveguide, and contrast values in the transmitted intensity up to several tens of percents are demonstrated.
URIhttp://hdl.handle.net/2117/76509
ISSN2330-4022
Publisher versionhttp://pubs.acs.org/doi/abs/10.1021/acsphotonics.5b00050
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