Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 33: Optical Properties 2

HL 33.9: Vortrag

Donnerstag, 8. September 2022, 17:30–17:45, H32

Enhancing directivity in optical waveguide antennas — •Henna Farheen¹, Lok-Yee Yan², Till Leuteritz², Siqi Qiao², Florian Spreyer¹, Christian Schlickriede¹, Viktor Quiring¹, Christof Eigner¹, Thomas Zentgraf¹, Stefan Linden², Viktor Myroshnychenko¹, and Jens Förstner¹ — ¹Paderborn University, Paderborn, Germany — ²Universität Bonn, Bonn, Germany

We show the numerical and experimental realization of optimized broadband optical traveling-wave antennas made from low-loss dielectric materials. The antennas are composed of a director and reflector placed over a glass substrate and a dipole emitter located in the feed gap between them serves as an internal source of excitation. Our studies reveal that the highly directive nature of our antennas comes from two dominant guided TE modes excited in the waveguide-like director of the antenna, in addition to the leaky modes. Furthermore, our numerical results are in excellent agreement with the experimental measurements of the antennas that were fabricated using a two-step electron beam lithography. Compared to the previously studied plasmonic antennas for photon emission, our all-dielectric approach demonstrates a new class of highly directional, low loss, and broadband optical antennas.

[1]Farheen, Henna, et al. Optimization of optical waveguide antennas for directive emission of light. JOSA B 39.1 (2022): 83-91.

[2]Farheen, Henna, et al. Broadband optical Ta2O5 antennas for directional emission of light. Optics Express 30.11 (2022): 19288-19299.