Vol. 17 No. 4 (2025)

In 2020, Warsaw University of Technology established seven Priority Research Areas (PRAs) under the Excellence Initiative Research University Program. The PRA Photonics technologies, one of seven priorities, has been focused on the design and manufacturing of optical components and novel photonic materials, as well as the development of innovative technologies and measurement methods. The idea behind the Excellence Initiative Research University Program carried out in the years 2020-2025 was to select the best Polish universities and provide them with an opportunity to grow so that, in the future, they can be ranked among renowned universities all over the world. The results of PRA Photonics technologies have been published in more than 70 renowned journal papers including 25 Top10 papers [1-25], and have led to two successful European ERC grants.

The current, 68th Photonics Letters of Poland issue (Vol. 17 No. 4, 2025) contains papers related directly to the research activities of the PRA Photonics technologies, and it completes the 64th Photonics Letters of Poland issue (Vol. 16 No. 4, 2024).

The following research activities in photonic technologies carried out over the last five years at Warsaw University of Technology are reported in the current issue. O. Gridyakina et al. described dual-frequency liquid crystals for tunable beam steering in the 0.1–3.5 THz photonics. M. Kałuża et al. presented a hologram-based architecture for fan-in coupling in four-core fibers. J. Korec-Kosturek et al. demonstrated Fabry-Pérot resonators with high-reflectivity coatings that have been 3D-printed on the end-face of the optical fibers using the Photonic Professional 3D femtosecond direct laser writing system, Nanoscribe Professional GT2. The paper by M. Kwaśny et al. reported the generation and electric-field stabilization of scalar vortex nematicons in a low-birefringence nematic liquid crystal.

Tomasz R. Woliński
Priority Research Area: Photonics technologies Chair

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