Active Control of Surface Plasmon Waveguides with a Phase Change Material

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Tipus de documentArticle
Data publicació2015-05-25
Condicions d'accésAccés obert
Projecte de la Comissió Europea
PLASMOLIGHT - 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.
ISSN2330-4022
Versió de l'editorhttp://pubs.acs.org/doi/abs/10.1021/acsphotonics.5b00050
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Fitxers | Descripció | Mida | Format | Visualitza |
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acsphotonics%2E5b00050.pdf | 3,507Mb | Visualitza/Obre |
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