We study the applicability of superconducting NbN vacuum bridge bolometer arrays with room temperature readout electronics to passive THz imaging applications. We show that sufficient bandwidth for video-rate mechanical scanning in terms of stability and noise can be reached by exploiting the divergences of the bolometer noise temperature and the differential impedance at the I - V curve minimum. Experimental electrical noise equivalent power is 9 fW/Hz1/2. This would correspond to ¡10 times the photon noise in a bandwidth of 0.5 THz and is comparable to the expected clutter in passive THz images due to atmospheric fluctuations.
- Passive imaging
- Superconducting bolometers
Helistö, P., Penttilä, J., Sipola, H., Grönberg, L., Maibaum, F., Luukanen, A., & Seppä, H. (2007). NbN vacuum bridge bolometer arrays with room temperature readout approaching photon noise limited THz imaging applications. IEEE Transactions on Applied Superconductivity, 17(2), 310-313. https://doi.org/10.1109/TASC.2007.898648