Plasmonic Metafiber Devices -Taking Refraction Index Sensor as an Example

Place: Conference hall, IMDEA Nanociencia

Abstract: 

Metafibers expand the functionalities of conventional optical fibres to unprecedented nanoscale light manipulations by integrating metasurfaces on the fibre tips, becoming an emerging light-coupling platform for both the nanoscience and fibre optics communities. Here, I will take the refraction index (RI) sensors as an example to show the extraordinary freedom and performance of metafiber devices. It is known that it is a tradeoff between high resolution and wide linear range for RI sensors. Here, we address this challenge by coupling optical modes from the Fabry–Perot (FP) cavity and plasmonic metasurfaces, and integrate the whole device on the end facet of optical fibers for in-situ sensing applications. In the end, an RI fiber sensor with both high resolution (2664 RIU⁻¹) and broadbanded RI sensing range (1.330–1.430 in the simulation and 1.3403–1.3757 in the experiment) is realized, breaking such a conventional tradeoff. The size of the whole device is merely r=h=30 μm.

Short biography:

Prof. Jiyong Wang received his double PhD degrees in Nanoscience and Technology from the University of Technology of Troyes, France and in Physical and Theoretical Chemistry from Eberhard Karls University of Tuebingen, Germany, in 2017. He then joined the near-field optics group at the CNRS-University of Bourgogne as a postdoctoral researcher for one year.  From 2018, he worked as a research fellow at Prof. Min Qiu’s group of Westlake University, China. Since the autumn of 2022, he started his research at Hangzhou Dianzi University as a full-time professor. His research interests include plasmonic nanostructures, nonlinear plasmonic spectroscopy and metafiber devices.