http://www.cnr.it/ontology/cnr/individuo/prodotto/ID181215

Operation of a Wideband Terahertz Superconducting Bolometer Responding to Quantum Cascade Laser Pulses (Articolo in rivista)

Type

Label

Operation of a Wideband Terahertz Superconducting Bolometer Responding to Quantum Cascade Laser Pulses (Articolo in rivista) (literal)

Anno

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

Alternative label

S. Cibella, M. Beck, P. Carelli, M.G. Castellano, F. Chiarello, J. Faist, R. Leoni, M. Ortolani, L. Sabbatini, G. Scalari, G. Torrioli, D. Turcinkova (2012)
Operation of a Wideband Terahertz Superconducting Bolometer Responding to Quantum Cascade Laser Pulses
in Journal of low temperature physics
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

S. Cibella, M. Beck, P. Carelli, M.G. Castellano, F. Chiarello, J. Faist, R. Leoni, M. Ortolani, L. Sabbatini, G. Scalari, G. Torrioli, D. Turcinkova (literal)

Rivista

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Istituto di Fotonica e Nanotecnologie, CNR, Via Cineto Romano 42, 00156 Roma, Italy; Institute of Quantum Electronics, Eidgenossische Technische Hochschule Zurich, Zurich, Switzerland; Dipartimento di Ingegneria Elettrica e dell'Informazione, Università, Aquila, Italy; Dipartimento di Fisica, Università Roma TRE, Via della Vasca Navale 84, 00146 Roma, Italy; (literal)

Titolo

Operation of a Wideband Terahertz Superconducting Bolometer Responding to Quantum Cascade Laser Pulses (literal)

Abstract

We make use of a niobium film to produce a micrometric vacuum-bridge superconducting bolometer responding to THz frequency. The bolometer works anywhere in the temperature range 2-7 K, which can be easily reached in helium bath cryostats or closed-cycle cryocoolers. In this work the bolometer is mounted on a pulse tube refrigerator and operated to measure the equivalent noise power (NEP) and the response to fast (mu s) terahertz pulses. The NEP above 100 Hz equals that measured in a liquid helium cryostat showing that potential drawbacks related to the use of a pulse tube refrigerator (like mechanical and thermal oscillations, electromagnetic interference, noise) are irrelevant. At low frequency, instead, the pulse tube expansion-compression cycles originate lines at 1 Hz and harmonics in the noise spectrum. The bolometer was illuminated with THz single pulses coming either from a Quantum Cascade Laser operating at liquid nitrogen temperature or from a frequency-multiplied electronic oscillator. The response of the bolometer to the single pulses show that the device can track signals with a rise time as fast as about 450 ns. (literal)

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