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11-16 April 2026
Conference 13006 > Paper 13006-60
Paper 13006-60

Investigating the efficient light coupling into a microdisk in presence and absence of a polymer coating

11 April 2024 • 14:00 - 14:20 CEST | Etoile B, Niveau/Level 1

Abstract

In this work, efficient light coupling into a microdisk capable of sustaining whispering gallery modes is thoroughly investigated, in order to understand the effect of polymer coating on the coupling efficiency. Light coupling within the microdisk from a tapered single mode optical fiber (SMF) is modelled and simulated, in presence and absence of a 100 nm thick polystyrene (PS) shell. The critical coupling parameters, such as the optical fiber distance to the microresonator (𝑑x) as well as the fiber optical properties such as cladding material (𝑛clad) are altered in order to achieve an efficient coupling and accordingly a high-quality factor 𝑄_F in the microresonator. Results show that the 𝑄_F of the resonators can exceed 10^4 only by tuning the geometrical parameter such as coupling distance 𝑑x where the ideal 𝑑x for uncoated and PS-coated microresonator is 0.55 μm and 0.40 μm respectively. Additionally, the sensitivity of the surrounding medium including the variation of the SMF cladding layer can be improved via using thin PS coatings on the surface of the microresonators.

Presenter

Brahim Bessif
Univ. Duisburg-Essen (Germany)
Brahim Bessif is a physicist and materials scientist, holding a Ph.D. in Experimental Polymer Physics from the University of Freiburg. His academic expertise is reflected in M.Sc. in Nano-Physics and Nanostructures from the University of Grenoble Alpes. He is currently serving as a Material and Electrical Engineer (Postdoc), at the BioEM Center in the Laboratory for General and Theoretical Electrical Engineering (ATE), at the University of Duisburg-Essen. Specializing in biosensors and photonics, he employs expertise in MATLAB, COMSOL, spectroscopy and various fabrication and characterization tools. His career is marked by previously roles as an R&D Engineer at the Institute of Physics, Freiburg University, R&D scientist at CEA LETI, Grenoble, and ENS Photonic team, Lyon. Notable achievements include contributions to advancements in photonics of nanoparticles, and periodic alternating layers. A recipient of the Excellence Prize in 2016 and the Marie Curie Scholarship from 2018 to 2021.
Application tracks: Sustainability
Presenter/Author
Brahim Bessif
Univ. Duisburg-Essen (Germany)
Author
Univ. Duisburg-Essen (Germany)
Author
Daniel Erni
Univ. Duisburg-Essen (Germany)