Time-Domain Characterization of the Radiation Pattern of the Terahertz Photoconductive Antennas

Elmabruk, Kholoud; Demir, Kazim; Altan, Hakan; Sahin, A.B.; Ünlü, Mehmet

doi:10.1007/s10762-019-00588-y

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…4(a,b) for layouts. A similar approach, but for a free-space-coupled system, can be found in [22]. Again, the scanning plane did not correspond to the middle plane of the THz setup used for methods A and the former B.…”

Section: Removed Focusing Tpx Lens Scanning Methodsmentioning

confidence: 99%

“…Seminal work was carried out around the turn of the century in these fronts for optical free-spacecoupled [13], [14], fiber-coupled [15]- [17] and hybrid [18] in-house systems. Since then, beam characterization of freespace-coupled in-house systems has been undertaken [19]- [22]. Nowadays, most commercial THz TDS systems are fibercoupled to utilise the mature and cost-efficient telecom technology.…”

Section: Introductionmentioning

confidence: 99%

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Beam Profiling of a Commercial Lens-Assisted Terahertz Time Domain Spectrometer

Freer

Gorodetsky

Navarro‐Cía

2021

IEEE Trans. THz Sci. Technol.

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To undertake THz spectroscopy and imaging, and accurately design and predict the performance of quasi-optical components, knowledge of the parameters of the beam (ideally Gaussian) emitted from a THz source is paramount. Despite its proliferation, relatively little work has been done on this in the frame of broadband THz photoconductive antennas. Using primarily pinhole scanning methods, along with stepwise angular spectrum simulations, we investigate the profile and polarization characteristics of the beam emitted by a commercial silicon-lensintegrated THz photoconductive antenna and collimated by a TPX (polymethylpentene) lens. Our study flags the limitations of the different beam profiling methods and their impact on the beam Gaussianity estimation. A non-Gaussian asymmetric beam is observed, with main lobe beam waists along x and y varying from 8.4±0.7 mm and 7.7±0.7 mm at 0.25 THz, to 1.4±0.7 mm and 1.4±0.7 mm at 1 THz, respectively. Additionally, we report a maximum cross-polar component relative to the on-axis co-polar component of-11.6 dB and-21.2 dB, at 0.25 THz and 1 THz, respectively.

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Section: Removed Focusing Tpx Lens Scanning Methodsmentioning

confidence: 99%