We present a nonresonant photoconductive terahertz detection antenna suitable for detection of both focused and unfocused terahertz radiations. Our system consists of a scalable terahertz emitter based on an interdigitated electrode structure and a detection antenna with similar electrode geometry. While the emitter is fabricated on semi-insulating GaAs we compare different ion-implanted GaAs-based detection antennas. We studied the dependence of the measured terahertz signal on the power and spot size of the gating laser pulse. In addition we compare the performance of our antenna with that of electro-optical sampling.
Skalierbare Antennenstrukturen, basierend auf fotoleitenden GaAs-Substraten, eignen sich hervorragend zur Erzeugung und Detektion von gepulster THz-Strahlung. Als Emitter liefern diese Elemente intensivere THz-Strahlung, verglichen mit gängigen Emittern, wenn die Anregung mit einem typischen Titan-Saphir-Laser-Oszillator-System erfolgt. Für die Detektoren werden Substrate mit unterschiedlichen Ladungsträger-Lebensdauern verglichen. Die Detektoren sind sehr flexibel bezüglich der Fokussierung sowohl des Terahertz-wie des nahinfraroten Abfragestrahls. Experimente zur Terahertz-Time-Domain-Spektroskopie (THz-TDS) an Papierschichten und Schokoladenpralinen dienen als Beispiel für die Stärke dieser Technik.Scalable antenna structures based on photoconducting GaAs substrates are excellent devices for both generation and detection of pulsed terahertz radiation. Scalable emitters yield more intense radiation as compared to conventional emitters excited with a typical titanium-sapphire laser oscillator system. For the detectors materials with different carrier lifetimes are compared. The detectors are very flexible with respect to the focussing of both the terahertz and the near infrared beams. Terahertz-time-domain spectroscopy (THz-TDS) experiments on paper and chocolate candy serve as examples for the power of this technique.
We present a novel non-resonant photoconductive antenna for coherent detection of THz radiation. The antenna consists of an interdigitated electrode structure, where every other electrode gap is covered by a second metallization layer. Different substrate materials with different carrier lifetimes are compared. These antennas are easy to use and offer a high degree of freedom with respect to the focusing of both the THz and the gating beam.
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