研究目的
Investigating the photoresponse of current-biased superconductor/normal metal strips with large ratio of resistivities as detectors of electromagnetic radiation.
研究成果
The study demonstrates that thin SN strips made of dirty superconductor and low resistive normal metal are good candidates for active elements of electromagnetic radiation detectors due to their strong temperature-dependent critical current and higher sensitivity compared to ordinary superconducting strips.
研究不足
The study notes that attempts to fit experimental results within the Usadel approach were not successful, indicating limitations in theoretical modeling. Additionally, the presence of a Mo layer or layer with lower concentration of nitrogen on the interface with substrate affects the results.
1：Experimental Design and Method Selection:
The study involves the fabrication of MoN/Cu and MoN strips with varying thicknesses of Cu layer to investigate their photoresponse.
2：Sample Selection and Data Sources:
Samples are grown by magnetron sputtering on silicon substrates, with transport measurements conducted to find dependencies R(T), Ic(T), and Ir(T).
3：List of Experimental Equipment and Materials:
Equipment includes a magnetron sputtering system, Ar+ ion etching using a Plasmalab 80 plus, and a supercontinuum generator 'Fianium' SC-400 for optical and near infrared radiation.
4：Experimental Procedures and Operational Workflow:
Photo-response measurements are carried out at T =
5：2K using a pulse technique with optical and current pulses. Data Analysis Methods:
The two-temperature model is used to calculate the electron temperature Te from the absorbed electromagnetic power.
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