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Millimeter/Terahertz and nano-optical antennas and devices
10:50 Keynote talk: Gap Waveguide Technology using Periodic Structures with Higher Symmetries
online, live
Eva Rajo-Iglesias
University Carlos III of Madrid (Spain)
In this work, the use of holes instead of pins for the implementation of the groove version is presented. The periodic structure based on the use of holes requires the glide symmetrical disposition of the unit cell to provide a complete and wide stopband for the parallel plate modes. Design guidelines for this version will be detailed and the advantages in terms of manufacturing will be discussed together with the limitations when compared to the use of pins. Some examples of designed antennas and components in the millimeter wave band using this approach will be presented in the talk.
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11:20 Invited talk: Phase control of THz-wave in multi-port waveguide structure coupled with bull's-eye antenna
Seigo Ohno
Tohoku University (Japan)
We have analytically and numerically investigated phase control feature of terahertz wave in a waveguide structure coupled with a bull's-eye antenna via polarization state of the wave incident to the bull's-eye antenna. In this presentation, we will introduce the theoretical extension to the multiport waveguide aligned in parallel nearby the tiny hole of the bull's-eye antenna and show some numerical results.
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11:40 Invited talk: Generation of high-quality tunable terahertz vortices based on difference frequency generation
online, on-demand
Katsuhiko Miyamoto, Takashige Omatsu
Chiba University (Japan)
We demonstrate a high-quality tunable terahertz (THz) vortices generation based on difference frequency generation in combination with Gaussian and vortex modes.
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online, on-demand
Qing Le Zhang, Bao Jie Chen, Kam Man Shum, Chi Hou Chan
City University of Hong Kong (China)
We present a planar terahertz goubau-line antenna with endfire radiation based on the substrate mode in this paper. As the antenna substrate thickness increases, the goubau line can excite the substrate mode and thus the truncated substrate will work as an antenna to generate endfire radiation. The proposed antenna operates from 325 GHz to 430 GHz on a 300 $\mu$m thick quartz substrate, and achieves the endfire radiation with 9.5-10.85 dBi gain.
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online, live
Abhishek Singh (1), Alexej Pashkin (1), Stephan Winnerl (1), Malte Welsch (1), Cornelius Beckh (2), Philipp Sulzer (2), Alfred Leitenstorfer (2), Manfred Helm (1), Harald Schneider (1)
(1)Helmholtz-Zentrum Dresden-Rossendorf (Germany) , (2)University of Konstanz (Germany)
Using gold-implantated germanium, where the carrier lifetime is shortened by more than three orders of magnitude, we have demonstrated a broadband photoconductive THz emitter compatible with modelocked fiber lasers operating at wavelengths of 1.1 and 1.55 um and pulse repetition rates up to 20 MHz. The emitted THz spectrum spans up to 70 THz. This approach opens up a prospect for manufacturing of compact, high-bandwidth THz photonic devices compatible with Si CMOS technology.
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