Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Poster: Quantum Optics and Photonics I

Q 24.13: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik

Slow light-enhanced optical imaging of microfiber radius variations with sub-Angström resolution — •Jürgen Volz¹, Khaled Kassem¹, Michael Scheucher¹, Philipp Schneeweiss¹, and Arno Rauschenbeutel^1,2 — ¹Atominstitut der TU Wien, Austria — ²Humboldt Universität zu Berlin, Germany

Optical fibers play a key role in many different fields of science and technology. For many of these applications it is of outmost importance to precisely know and control their local radius. Here, we demonstrate a novel technique to determine the variation of the radius of a micrometer-sized silica fiber with sub-Angström precision over several hundred micrometer in a single shot. For this purpose, we image the axial mode structure of whispering gallery modes (WGMs) that form along the fiber. Due to these WGMs, the speed of the light along the fiber axis is strongly reduced. This speed reduction results in a magnification of the axial wavelength in axial direction which enables us to optically measure the fiber radius variations with significantly enhanced resolution. By exciting several different axial modes at different probing fiber positions, we verify the precision and reproducibility of our method and demonstrate that we can achieve a precision better than 0.3 Angström. The demonstrated method can be generalized to many experimental situations where slow light occurs and, thus, has a large range of potential applications in the realms of precision metrology and optical sensing.