Twisted Anti-Resonant Hollow-Core Fiber as a Broadband Filter for the Sign of the Topological Charge
Helfrich C, Frosz MH, Tani F (2025)
Publication Type: Conference contribution
Publication year: 2025
Publisher: Institute of Electrical and Electronics Engineers Inc.
Conference Proceedings Title: 2025 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2025
Event location: Munich
ISBN: 9798331512521
DOI: 10.1109/CLEO/EUROPE-EQEC65582.2025.11110815
Abstract
In analogy to circular dichroism (CD), the term helical dichroism (HD) describes the differential loss between opposite signs of the topological charge ℓ = ±1, ±2, … of annular vortex beams. HD has been observed in different systems, including molecules [1] and nanostructured materials [2]. In this work, we present a waveguide exhibiting significantly stronger HD in comparison to previous reports about other platforms [2]. We measure 10 dB loss difference in a twisted anti-resonant hollow-core fiber for ℓ = ±1 (25 cm fiber length) in the spectral range 520 nm to 580 nm. Our numerical calculations predict even higher differential loss over a much broader spectral range.
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APA:
Helfrich, C., Frosz, M.H., & Tani, F. (2025). Twisted Anti-Resonant Hollow-Core Fiber as a Broadband Filter for the Sign of the Topological Charge. In 2025 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2025. Munich, DE: Institute of Electrical and Electronics Engineers Inc..
MLA:
Helfrich, Christof, Michael H. Frosz, and Francesco Tani. "Twisted Anti-Resonant Hollow-Core Fiber as a Broadband Filter for the Sign of the Topological Charge." Proceedings of the 2025 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2025, Munich Institute of Electrical and Electronics Engineers Inc., 2025.
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