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• W3011998936 abstract "Imaging with terahertz (THz) radiation gains increasing interest, because it reaches better spatial resolution than imaging with microwaves, while it maintains the advantages of a non-ionizing character and the transparency of many materials. Coherent detection, which provides both intensity and phase information, plays a key role in many emerging THz imaging applications. However, in conventional heterodyne detection, usually a semi-transparent beam-combiner is employed to couple the object wave and the reference wave onto the same beam path in front of the detector chip. This results in a bulky detector system and considerable loss. In the measurement systems considered in our work, the waves are coupled to the detector element, a THz-sensitive field-effect transistor (TeraFET), through the detector chip’s substrate to which a silicon substrate lens is attached. Coupling the reference radiation onto the TeraFET from the front side would allow to avoid the use of the beam-combiner. However, front-side coupling is inefficient because of the absence of a silicon substrate lens whose implementation to the chip’s front side is prohibited by the presence of the detector’s bonding wires. In this contribution, we introduce a novel lens-formation approach using paraffin wax with a low melting temperature. Dripping the liquid wax onto the detector allows to embed the bonding wires within the lens. The surface tension of the molten wax leads to a close-to-super-hemispherical shape of the droplet which is maintained upon solidification. Care has to be taken to correctly center the lens on the detector. Imaging results with a TeraFET without and with an integrated wax lens (of a diameter of 8 mm) in a Fourier imaging experiment show that the paraffin wax lens improves the coupling efficiency of the 300-GHz reference radiation by at least 6 dB. The dynamic range and the useful focal-plane area of the raw data are enhanced by the wax lens, with the consequence that the resolution of the reconstructed image is improved considerably." @default.
• W3011998936 created "2020-03-23" @default.
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• W3011998936 date "2019-12-01" @default.
• W3011998936 modified "2023-10-16" @default.
• W3011998936 title "Dynamic-range Enhancement of Heterodyne THz Imaging by the Use of a Soft Paraffin-wax Substrate Lens on the Detector" @default.
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• W3011998936 doi "https://doi.org/10.1109/piers-fall48861.2019.9021735" @default.
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