Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster VIII

Q 57.3: Poster

Donnerstag, 14. März 2024, 17:00–19:00, Aula Foyer

Optofluidic lasing within a fiber-based microresonator — •Mustafa Gerdan, Shalom Palkhivala, Larissa Kohler, and David Hunger — Karlsruhe Institute of Technology, Karlsruhe, DE

Most biochemical processes which are of interest to biological examinations occur in aqueous environments and require sensitive measurement techniques. The process of laser generation is highly sensitive to subtle changes in environmental conditions, making a lasing-based sensor a promising candidate for biosensing. As a first step towards optofluidic lasing-based sensing, we have demonstrated a dye microlaser in a fiber-based Fabry-Perot optical resonator [1] using rhodamine 6G as a gain medium. The resonator is integrated into a microfluidic system, allowing reactions within the gain medium to directly influence the lasing of the microlaser. By monitoring the lasing output, e.g. via the lasing threshold, small changes in the vicinity can be investigated. We shall report work towards constructing an optofluidic microlaser using europium-based molecules [2] as the gain medium. Europium presents distinct advantages in contrast to organic dyes, including its resistance to bleaching, precisely defined energy levels of the 4f-states, narrow linewidth of f-f transitions, and long lifetime. Such a device shows promise as a sensitive method in the monitoring of biochemical processes, such as small concentration changes or cell dynamics in a solution phase.

[1] Kohler, L. et al. Nat Commun 12, 6385 (2021)

[2] Kuzmanoski, A. et al. Zeitschrift für Naturforschung B,

Vol. 69 (Issue 2), pp. 248-254 (2014)

Keywords: optofluidic lasing; microresonator; sensing