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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.38: Poster

Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG

Fabrication of shape optimized, adiabtic fiber tapers for highly efficient cavity to fiber coupling — •Pascal Frehle and Max Heimann — Humboldt-Universität zu Berlin, Institut für Physik

Fiber coupling in quantum networking is essential for establishing world wide communication links. Therefore an efficient, stable and scalable solution for coupling of light from nanostructures within integrated photonic circuit to optical fibers is needed. One of the most efficient ways to realize this chip to fiber interface is the adiabatic mode transfer from nanostructures to optical-fiber nanotapers. We present an automated setup to fabricate shape and surface roughness optimized optical-fiber nanotapers via an etching process in hydrofluoric-acid (HF), which produces tapers with high transmission efficiency and short taper lengths. We also show improved diamond sawfish cavity resonance measurement capabilites via evanescent coupling of the produced nanotapers to cavities in comparison to confocal measurements and our progress towards a permanent and stable fiber cavity interface for cryogenic temperatures.

Keywords: optical fiber nanotapers; nanostructure; fiber-chip interface