Abstract
In this paper, we present sensitivity measurement as well as measured and calculated absorption spectra for AlGaN/GaN THz plasmonic detector made of a metallic grating in-between two ohmic contacts. Detectors with different grating patterns have been fabricated and their sensitivity, reaching 1.9 μA/W at 77 K and 0.7 μA/W at 300 K, measured with a voltage applied between the ohmic contacts. It is the first time that such a detector shows THz detection with no voltage applied on the grating, namely with a bidimensional electron gas (2DEG) having a homogeneous electron density. These results are consistent with detection by drag-effect rectification. Measurements held between 0.648 and 0.690 THz show that the dependence of the sensitivity on the frequency follows the absorption spectrum, indicating that absorption is a crucial step in the detection process. Further simulations of absorption spectra show the tunability offered by such detector and allow us to predict frequency behavior for grating-biased detectors as well, in which the rectification is mainly governed by ratchet effect.
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Acknowledgments
The authors acknowledge the support from GANEX (ANR-11-LABX-0014). GANEX belongs to the public funded Investissements d’Avenir program managed by the French ANR agency. This work was partly supported by the French RENATECH network.
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Spisser, H., Grimault-Jacquin, AS., Zerounian, N. et al. Room-Temperature AlGaN/GaN Terahertz Plasmonic Detectors with a Zero-Bias Grating. J Infrared Milli Terahz Waves 37, 243–257 (2016). https://doi.org/10.1007/s10762-015-0224-y
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DOI: https://doi.org/10.1007/s10762-015-0224-y