Abstract
We report on the energy-resolving capability of a superconducting NbN nanowire photoncounter, which is read out by a superconducting quantum interference device. For countersoperated at 6.5 K, a resolution of 0.55 eV was measured in the wavelength range from 1000to 1500 nm (photon energies 1.2–0.8 eV) along with a counting rate of 2 MHz. The bestenergy resolution occurred in the spectral range where the quantum efficiency of thecounter began to decrease with the wavelength. The results are explained by the change ofthe detection scenario from the hot-spot formation to unbinding of vortex–antivortex pairs.
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