SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 59: Poster IV
Q 59.56: Poster
Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof
Studying exceptional points in an optical fiber — •Quentin Levoy1, Flore K. Kunst1, and Birgit Stiller1,2 — 1Max-Planck-Institut für die Physik des Lichts, Erlangen, Germany — 2Department of Physics, Friedrich-Alexander-Universität, Erlangen, Germany
Exceptional points (EPs) are physical features appearing in non-Hermitian systems, which are typically systems subjected to loss and gains. At these EPs, the eigenvectors of the system coalesce and unique physical phenomena are displayed, such as an unusual dispersion and higher sensitivity to perturbations. EPs are the object of both theoretical and experimental studies. Even though they are associated to ubiquitious properties such as gain and loss and open system behaviour, it is not always straightforward to identify a physical platform that provides the right parameters to reach these EPs and to experimentally study them. Recently, it was proposed to use nonlinear optics and more specifically optoacoustics to finely tune gain and loss in an experimental setup, for instance an optical fiber. Here, we explore in detail how the interaction of optical and acoustic waves can provide an interesting framework to explore the properties of EPs and non-Hermitian physics. Observing this interaction in an optical fiber is one possible way to experimentally observe and study EPs of different orders, using only an optical fiber and a few laser beams.