Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 49: Poster – Photonics, Lasers, and Applications
Q 49.32: Poster
Wednesday, March 12, 2025, 17:00–19:00, Tent
Deterministic positioning of nanocrystals in polymer waveguides with direct-laser-writing — •Thomas Utz1, Artur Widera1, and Georg von Freymann1,2 — 1Physics Department RPTU Kaiserslautern-Landau, Kaiserslautern, Germany — 2Fraunhofer Institute for Industrial Mathematics ITWM, Kaiserslautern, Germany
In order to observe collective emission, it is necessary to localise the emitters in each direction to a length that is smaller than their emission wavelength. In the present study, nitrogen vacancy (NV) centers in nanodiamonds were used as emitters. The NV centers provide a well-controlled system for studying the collective emission. It is essential to achieve precise positioning of the two nanodiamonds in order to create optimal conditions for observing collective emission. We present a method for the fabrication of nanodiamond-doped waveguides that fulfil the conditions required for collective emission. The waveguides are fabricated in a heterostructure approach using the direct-laser-writing (DLW) process. In the initial phase of the process, the waveguide structures are written into a photopolymer without nanodiamonds, leaving small gaps in the waveguide to position the nanodiamonds in the next step. After development, a polymer containing nanodiamonds is used. The material is exposed only at the position of the gap to close the gap and incorporate the nanodiamonds. The volume fraction of nanodiamonds is selected in order to achieve an average of one nanodiamond per gap. After development, waveguides are fabricated with nanodiamonds in the desired position.
Keywords: Direct-Laser-Writing; Nitrogen vacancy centers; photonic waveguide; heterostructure