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We report on Gallium Nitride Self switching Diode used as detector in a terahertz imaging system. We propose to use the ionic implantation to define the nano-channels in the device, leading to an improved sensitivity in the mm-wave/THz regime. Preliminary results are given at 200 GHz.
An attempt of exploitation of very high frequency Gunn oscillations to generate a TeraHertz radiation is realized with an asymetric planar GaN self-switching diode. In this work we compare the measured static behavior of real devices with calculations performed by means of Monte Carlo simulations. We analyze the influence of the temperature on the I-V characteristic of the SSD and also on the high...
In this paper we present the advances on the fabrication of THz emitters and detectors obtained within the framework of the European ROOTHz project. Two types of devices are explored, self-switching diodes and slot-diodes, using both narrow bandgap and wide bandgap semiconductors. This broad approach allows us to improve the frequency and power generated by Gunn diodes and the responsivity and noise...
A self-switching diode (SSD) is based on an asymmetric nanochannel. The SSD is fabricated by tailoring the boundary of a narrow semiconductor channel to break its symmetry. An applied voltage V not only changes the potential profile along the channel direction but also either widens or narrows the effective channel width, depending on its sign. This results in a strong nonlinear current-voltage I-V...
A self-switching diode (SSD) is based on an asymmetric nanochannel. The SSD is fabricated by tailoring the boundary of a narrow semiconductor channel to break its symmetry. An applied voltage V not only changes the potential profile along the channel direction but also either widens or narrows the effective channel width, depending on its sign. This results in a strong nonlinear current-voltage I-V...
An AlGaN/GaN based field effect transistor (FET) has been designed, fabricated, and used as a resistive mixer for heterodyne detection in the 140-220 GHz frequency range. A double VNA heterodyne measurement setup has been used in an on-wafer configuration to accurately quantify the incident radiation absorbed by the device. The appropriate selection of optimum biasing conditions for minimum conversion...
We evaluate the optical performance of AlGaN/GaN MISFETs as a non-resonant sub-terahertz, room temperature detector. The single-pixel responsivity and the noise equivalent power are determined. The efficiency of the detection is demonstrated by the room temperature imaging of different solutions of acetone in cyclohexane.
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