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3 November 2016 Robust plasmonic tips fabricated by the tapering of composite hybrid silicate microfibers with metallic core
Afroditi Petropoulou, Grigoris Antonopoulos, Paul Bastock, Christopher Craig, Georgios Kakarantzas, Dan W. Hewak, Michalis N. Zervas, Christos Riziotis
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Proceedings Volume 10028, Plasmonics II; 100280N (2016) https://doi.org/10.1117/12.2246508
Event: SPIE/COS Photonics Asia, 2016, Beijing, China
Abstract
The development of plasmonic devices for sensing applications can offer high sensitivity and a dramatic improvement to the detection limits due to the high field enhancement at the metal surfaces. The platform proposed here is a tapered hybrid microfiber comprising a metal core and a glass cladding. The existence of a glass cladding not only serves as a mechanical host for the metal core, but also provides ease of handling regarding the tapering process. The advantages of this composite material system over pure metal tips are the absence of impurities and the multiple excitation of the plasmon modes due to the total internal reflection at the glass/air interface. The improved field enhancement at the apex of these tapered microwires was calculated through Finite Element Method (FEM) simulations. Enhancement factors up to 104 were theoretically observed for this type of tapered microwires. The use of different metals having different melting points and thermal expansion coefficients as well as different glass thicknesses can lead to an optimization of the tapering process conditions in order to achieve tapered microwires with the desirable geometrical characteristics.
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Afroditi Petropoulou, Grigoris Antonopoulos, Paul Bastock, Christopher Craig, Georgios Kakarantzas, Dan W. Hewak, Michalis N. Zervas, and Christos Riziotis "Robust plasmonic tips fabricated by the tapering of composite hybrid silicate microfibers with metallic core", Proc. SPIE 10028, Plasmonics II, 100280N (3 November 2016); https://doi.org/10.1117/12.2246508
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KEYWORDS
Metals
Cladding
Glasses
Plasmonics
Silicates
Gold
Copper
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