Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 54: Posters: Quantum Optics and Photonics IV

Q 54.27: Poster

Thursday, March 12, 2020, 16:30–18:30, Empore Lichthof

Experimental Realisation of PT-Symmetric Flat Bands — •Tobias Biesenthal, Mark Kremer, Matthias Heinrich, and Alexander Szameit — Institut für Physik, Universität Rostock, Albert-Einstein-Straße 23, 18059 Rostock, Germany

Shaping the flow of light remains one of the core objectives in optics, and is inextricably linked to the concept of flat dispersion bands. At the same time, parity-time symmetric photonics provides new insights into the interplay of the real- and imaginary parts of complex potentials. We experimentally demonstrate that flat bands and compact localized states can be established at exceptional points of PT-symmetric lattices. Hence, even in scenarios aiming to arrest the propagation and diffractive broadening of optical signals, losses are not necessarily detrimental, and can serve as key ingredient in achieving photonic flat band responses in non-Hermitian environments.