Publication

Characterization of superconducting single photon detectors fabricated on MgO substrates

Francesco Marsili, Alessandro Gaggero
2008
Conference Papers

Résumé

Electrical and optical characterization has been performed on several superconducting single photon detectors (SSPDs) consisting of meanders made of ultrathin NbN films. The NbN films, with thickness ranging from 150 nm to 3 nm, were deposited by dc magnetron sputtering on MgO substrates kept at temperature T = 400C. This deposition process carried out at low temperature opens the way of monolithic integration with other photonic devices. The superconducting properties of NbN films and the critical design parameters that affect the quantum efficiency (QE) have been optimized. In particular, by measuring the switching current distribution of each stripe of the meander the process uniformity has been studied. Optical measurements on the fabricated SSPDs showed a QE approximate to 20% at 4.2 K for photons with a wavelength of 1300 nm.

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https://infoscience.epfl.ch/entities/publication/923a5f71-ac47-43dc-ad10-9e06610d3247

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Francesco Marsili, Alessandro Gaggero
2008
Conference Papers

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/923a5f71-ac47-43dc-ad10-9e06610d3247

À propos de ce résultat

Concepts associés (26)

Supraconductivité

La supraconductivité, ou supraconduction, est un phénomène physique caractérisé par l'absence de résistance électrique et l'expulsion du champ magnétique — l'effet Meissner — à l'intérieur de certains matériaux dits supraconducteurs. La supraconductivité découverte historiquement en premier, et que l'on nomme communément supraconductivité conventionnelle, se manifeste à des températures très basses, proches du zéro absolu (). La supraconductivité permet notamment de transporter de l'électricité sans perte d'énergie.

Superconducting wire

Superconducting wires are electrical wires made of superconductive material. When cooled below their transition temperatures, they have zero electrical resistance. Most commonly, conventional superconductors such as niobium–titanium are used, but high-temperature superconductors such as YBCO are entering the market. Superconducting wire's advantages over copper or aluminum include higher maximum current densities and zero power dissipation.

Superconducting magnet

A superconducting magnet is an electromagnet made from coils of superconducting wire. They must be cooled to cryogenic temperatures during operation. In its superconducting state the wire has no electrical resistance and therefore can conduct much larger electric currents than ordinary wire, creating intense magnetic fields. Superconducting magnets can produce stronger magnetic fields than all but the strongest non-superconducting electromagnets, and large superconducting magnets can be cheaper to operate because no energy is dissipated as heat in the windings.

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