Articolo in rivista, 2020, ENG, 10.3390/condmat5020033

Proximity Array Device: A Novel Photon Detector Working in Long Wavelengths

Rezvani, S. Javad; Di Gioacchino, Daniele; Gatti, Claudio; Ligi, Carlo; Guidi, Mariangela Cestelli; Cibella, Sara; Fretto, Matteo; Poccia, Nicola; Lupi, Stefano; Marcelli, Augusto

Ist Nazl Fis Nucl; Ist Nazl Ric Metrol INRiM; CNR; IFW Dresden; Ist Nazl Fis Nucl; Univ Sapienza; RICMASS

We present here an innovative photon detector based on the proximity junction array device (PAD) working at long wavelengths. We show that the vortex dynamics in PAD undergoes a transition from a Mott insulator to a vortex metal state by application of an external magnetic field. The PAD also evidences a Josephson I-V characteristic with the external field dependent tunneling current. At high applied currents, we observe a dissipative regime in which the vortex dynamics is dominated by the quasi-particle contribution from the normal metal. The PAD has a relatively high photo-response even at frequencies below the expected characteristic frequency while, its superconducting properties such as the order parameter and the Josephson characteristic frequency can be modulated via external fields to widen the detection band. This device represents a promising and reliable candidate for new high-sensitivity long-wavelength detectors.

Condensed matter 5 (2)

Keywords

niobium, proximity effects, superconductivity, detectors, terahertz, Vortex dynamics

CNR authors

Cibella Sara

CNR institutes