Delft nano-detector very promising for remote cosmic realms
Coloured scanning electron microscope image showing a superconducting 'hot electron bolometer' (HEB) for detection of terahertz radiation. The superconducting niobiumnitride nano-bridge is shown at the center which connects to the on-chip (partly shown) gold spiral antenna via additional contact pads. The strip covering the bridge is a left-over from the processing.
Merlijn Hajenius developed these sensors for Delft University of Technology's Kavli Institute of Nanoscience, in close cooperation with the SRON Netherlands Institute for Space Research. He will receive his Delft University of Technology PhD degree on 19 January based on this research subject.
The detector, called a 'hot electron bolometer', is based on the well-known phenomenon that electrical resistance increases when something is heated up. The use of a superconductor renders the detector extremely sensitive and allows it to be used for radiation that until now could not be so well detected.
The detector works for terahertz frequencies, which astronomers and atmospheric scientists are extremely interested in. The detector's core is comprised of a small piece of superconducting niobiumnitride. Clean superconducting contacts that are kept at a constant temperature of –268 °C (five degrees above absolute zero) are attached to both ends of the superconducting niobiumnitride.
A miniscule gold antenna catches the terahertz-radiation and sends it via the contacts to the small piece of niobiumnitride, which functions as an extremely sensitive thermometer. “By reading this thermometer, we can very accurately measure the terahertz radiation. In Delft, we have set a world record with this detector in the frequency area above 1.5 terahertz,” Hajenius says proudly.
The results have convinced astronomers to use these detectors for the new observatory in Antarctica (HEAT), and a new space mission (ESPRIT) has also been proposed.
The ‘maiden flight’ of Hajenius’ detector is planned for next year, but it will not take place in a satellite used for studying cosmic clouds, but rather in a balloon that will study the earth's atmosphere. The TELIS instrument, which SRON is currently working on, will be equipped with a Delft University of Technology detector and will measure the molecules in the atmosphere above Brazil that influence the formation of the hole in the ozone layer.
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