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

Brahim Bessif; Mandana Jalali; Daniel Erni

doi:10.1117/12.3022110

20 June 2024 Investigating the efficient light coupling into a microdisk in presence and absence of a polymer coating

Brahim Bessif, Mandana Jalali, Daniel Erni

Proceedings Volume 13006, Biomedical Spectroscopy, Microscopy, and Imaging III; 130060Y (2024) https://doi.org/10.1117/12.3022110
Event: SPIE Photonics Europe, 2024, Strasbourg, France

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 (d_x) as well as the fiber optical properties such as cladding material (n_clad) 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 104 only by tuning the geometrical parameter such as coupling distance d_x where the ideal d_x 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.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Brahim Bessif, Mandana Jalali, and Daniel Erni "Investigating the efficient light coupling into a microdisk in presence and absence of a polymer coating", Proc. SPIE 13006, Biomedical Spectroscopy, Microscopy, and Imaging III, 130060Y (20 June 2024); https://doi.org/10.1117/12.3022110

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