Fundamental limitations of THz and Niobiumnitride SIS mixers

The research described in this thesis has focussed on the suitability of Nb and NbN SIS junctions as THz radiation detectors. Suitability, in the context of detectors for astrophysics, basically stands for sensitivity. The sensitivity of a detector is determined by the gain and the noise. The mixer gain is governed by the RF - and IF match to the junction together with the current - voltage characteristics. The noise generated by the junction mainly consists of shot noise resulting from the subgap current. The sensitivity of a THz receiver employing a Nb junction however is dominated by the loss in the RF integrated tuning circuit. ...

Zie: Summary

	titlepages/contents
	chapter 1
	chapter 2
	chapter 3
	chapter 4
	chapter 5
	chapter 6
	chapter 7
	chapter 8
	appendix
	references
	samenvatting

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