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Title

Non-contact Thermometry by Optical Phase Monitoring near the Point of Darkness of Self-assembled Metamaterials

AuthorsBaraldi, G. ; Garcia-Pardo, Marina; Gonzalo, J. ; Serna, Rosalía ; Toudert, Johann
Issue Date26-May-2019
Citation8th International Conference on Spectroscopic Ellipsometry (2019)
AbstractMonitoring the phase of light reflected by a metamaterial near the point of darkness ¿ the angle of incidence and wavelength at which reflectance cancels - is a powerful solution for detecting ultra-small changes in the metamaterial¿s environment. It takes advantage of the capability of metamaterials to present tailor-made optical properties with a high sensitivity to their environment, and of the sensitivity leveraging provided by optical phase detection near phase singularities. Therefore, such approach is appealing for developing sensors with an ultra-low limit of detection, in which the metamaterial is probed with light in a non-contact and non-invasive way. It can be applied for monitoring several variables, such as the concentration of biological or chemical species [1,2], or temperature [3]. However, relatively few practical examples of sensing experiments based on this approach have been reported, and most with complex metamaterials based either on lithographic nanostructures [1] or complex multilayer stacks [3]. In this presentation, we will demonstrate non-contact thermometry by optical phase monitoring near the point of darkness of self-assembled metamaterials, requiring no lithography fabrication and consisting of a two-layer stack [4]. In particular, we will show by temperature-dependent ellipsometry measurements that a sensitivity to temperature changes below 10-3 oC can be reached when using photonic-plasmonic cavity metamaterials consisting of a 2d assembly of Ag nanostructures capped by a dielectric layer. Moreover, we will show that this metamaterial structure enables measuring in real-time the temperature changes induced by a laser beam [5], and discuss strategies to increase the sensing performance through the optimization of the metamaterial structure. Finally, we will give insights into the potential performance of other self-assembled metamaterial platforms, including those based on p-block elements and compounds [6], for phase-monitored non-contact thermometry.
DescriptionICSE 8, Barcelona, Spain, May 26th - 31st, 2019
URIhttp://hdl.handle.net/10261/213191
Appears in Collections:(CFMAC-IO) Comunicaciones congresos
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