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One-volt en:voltage standard developed by en:NIST based on an array of 3020 superconducting en:Josephson junctions, operating at liquid- helium temperatures. Microwave energy fed into the finguide structure on the left generates a voltage across the 4 chains of junctions on the right.

Source: NIST paper A Practical Josephson Voltage Standard at One Volt, Figure 1


Public domain This image is in the public domain because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.

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