| 1. |
- Dancila, Dragos, et al.
(författare)
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Leaky Wave Antenna at 300 GHz in Silicon Micromachined Waveguide Technology
- 2019
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Ingår i: 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). - : IEEE. - 9781538682852 - 9781538682869
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Konferensbidrag (refereegranskat)abstract
- A leaky wave antenna composed of eight slots in a gold metallised silicon micromachined waveguide was designed, fabricated and measured at 300 GHz. The measured results are in good agreement with the simulations.
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| 2. |
- Ponseca, Carlito, et al.
(författare)
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Terahertz Helical Antenna Based on Celery Stalks
- 2019
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Ingår i: International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz. - : IEEE Computer Society. - 9781538682852 - 9781538682869
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Konferensbidrag (refereegranskat)abstract
- Cellulose-based helices retrieved from the plant celery with a conductive poly(4-(2,3-dihydrothieno [3,4-b]-[1,4]dioxin-2-yl-methoxy)-1-butanesulfonate (PEDOT-S). A resonance close to 1 THz and a broad shoulder that extends to 3.5 THz was obtained, consistent with electromagnetic models. As helical antennas, it was shown that both axial and normal modes are present, which are correlated to the orientation and antenna electrical lengths of the coated helices. This work opens the possibility of designing tunable terahertz antennas through simple control of their dimensions and orientation. © 2019 IEEE.
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| 3. |
- Soylu, G., et al.
(författare)
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Sub-wavelength THz imaging through optical rectification
- 2019
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Ingår i: International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz. - : IEEE Computer Society. - 9781538682852
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Konferensbidrag (refereegranskat)abstract
- Sub-wavelength THz imaging has previously been demonstrated by the optical rectification method, i.e. generating THz waves in the sample [1]. We have rendered the initial experimental setup more practical by using a simple fs laser oscillator and an efficient photo-conducting detector. We thus recorded images, at different THz frequencies with a 41-μm lateral resolution, of a sample made of ZnTe grains, and generated THz peak magnitudes with a 33 μm and 12 μm lateral resolution of a periodically poled KTP crystal.
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| 4. |
- Zhang, Wentao, et al.
(författare)
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Study of Ultrafast Magnetism by THz Emission Spectroscopy
- 2019
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Ingår i: 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). - 9781538682852 - 9781538682869
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Konferensbidrag (refereegranskat)abstract
- THz emission spectroscopy is a powerful tool to access ultrafast magnetization dynamics in laser-excited magnetic systems. Here, we demonstrate femtosecond terahertz magnetometry, a method that can be used to rigorously reconstruct the (sub)picosecond-timescalc magnetization dynamics in photoexcited magnetic sample from the detected THz emission. Considering the propagation of the THz field from the surface of the sample to the THz electro-optic sampling unit, we establish the transfer function, which allows us to obtain the ultrafast magnetization dynamics in the laser-excited sample in a calibrated manner.
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