Cryogenic detectors and electronics provide unprecedented sensitivity and energy resolution for the detection of photons. We are developing novel low-temperature (100 mK) superconducting microcalorimeters and bolometers for the detection of photons from X rays to millimeter waves. These devices, fabricated in our state-of-the-art clean room, consist of superconducting transition-edge sensors on micromachined structures. They are read out using unique high-speed, low-noise SQUID preamplifiers designed and fabricated here. Using these devices, we have demonstrated the highest energy resolution achieved with an energy-dispersive x-ray and gamma ray detector, and one of the most sensitive detectors of incident infrared/submillimeter power. We are employing these detectors in a system for x-ray microanalysis of materials on a scanning electron microscope and in a system for gamma-ray spectroscopy of nuclear materials. We are also developing arrays of x-ray microcalorimeters and infrared/submillimeter bolometers for astronomy and other applications. Research opportunities include improving our understanding of the nonequilibrium superconducting processes underlying the performance of superconducting detectors, developing novel micromachined structures to integrate detector arrays, developing and testing detector arrays, developing multiplexed superconducting integrated circuits for the readout of large arrays, and developing the first uses of these detectors in astronomy, materials analysis, nuclear non-proliferation, and other applications.

 

key words

Calorimetry; Integrated circuits; Photons and photon processes; Superconductivity; Thermal conditions and measurements;

Citizenship:  Open to U.S. citizens

Level:  Open to Postdoctoral applicants