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Q: Fachverband Quantenoptik und Photonik

Q 40: Optomechanics and Photonics

Q 40.12: Poster

Mittwoch, 16. März 2022, 16:30–18:30, P

Efficient and broadband in-plane interfacing to nanophotonic circuitry — •Hendrik Hüging¹, Daniel Wendland¹, Wladick Hartman², Helge Gehring¹, and Wolfram Pernice¹ — ¹Institute of Physics, University of Münster, Germany — ²Pixel Photonics GmbH

Efficient coupling over a wide wavelength regime between nanophotonic circuits and fiber optic components is crucial for optical communication, computing and sensing. It requires overcoming the size mismatch between the mode of the fiber core and that of the planar waveguide. This is currently archieved by edge coupling with inverse taper or by out-of-plane coupling via 3D laser written structures.

Here we present our work on 3D nanostructures for in-plane interfacing to reach high efficiency and broadband coupling. Finite difference time domain simulations are performed to find a suitable geometry for a coupling structure consisting of a linear taper and a focusing lens. Our experimental realization shows a coupling efficiency of -1.5dB/coupler at a wavelength of 1550nm. We plan to further optimize the geometry and test the adaptability of this approach for different wavelength regimes and fiber mode-field diameters. The structures are manufactured via Direct Laser Writing of IP-n162 at tapered Si3N4 photonic waveguides on a SiO2 on Si substrate.