We have measured the absorption of terahertz radiation in a BCS superconductor over a broad range of frequencies from 200 GHz to 1.1 THz, using a broadband antenna-lens system and a tantalum microwave resonator. From low frequencies, the response of the resonator rises rapidly to a maximum at the gap edge of the superconductor. From there on, the response drops to half the maximum response at twice the pair-breaking energy. At higher frequencies, the response rises again due to trapping of pair-breaking phonons in the superconductor. In practice, this is a measurement of the frequency dependence of the quasiparticle creation efficiency due to pair-breaking in a superconductor. The efficiency, calculated from the different non-equilibrium quasiparticle distribution functions at each frequency, is in agreement with the measurements.
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22 June 2015
Research Article|
June 25 2015
The non-equilibrium response of a superconductor to pair-breaking radiation measured over a broad frequency band Available to Purchase
P. J. de Visser;
P. J. de Visser
a)
1Kavli Institute of NanoScience, Faculty of Applied Sciences,
Delft University of Technology
, Lorentzweg 1, 2628 CJ Delft, The Netherlands
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S. J. C. Yates;
S. J. C. Yates
2
SRON Netherlands Institute for Space Research
, Landleven 12, 9747AD Groningen, The Netherlands
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T. Guruswamy
;
T. Guruswamy
3Cavendish Laboratory,
University of Cambridge
, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
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D. J. Goldie;
D. J. Goldie
3Cavendish Laboratory,
University of Cambridge
, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
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S. Withington;
S. Withington
3Cavendish Laboratory,
University of Cambridge
, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
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A. Neto;
A. Neto
4Faculty of Electrical Engineering, Mathematics and Computer Science, Terahertz Sensing Group,
Delft University of Technology
, Mekelweg 4, 2628 CD Delft, The Netherlands
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N. Llombart;
N. Llombart
4Faculty of Electrical Engineering, Mathematics and Computer Science, Terahertz Sensing Group,
Delft University of Technology
, Mekelweg 4, 2628 CD Delft, The Netherlands
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A. M. Baryshev;
A. M. Baryshev
2
SRON Netherlands Institute for Space Research
, Landleven 12, 9747AD Groningen, The Netherlands
5Kapteyn Astronomical Institute,
University of Groningen
, Landleven 12, 9747 AD Groningen, The Netherlands
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T. M. Klapwijk;
T. M. Klapwijk
1Kavli Institute of NanoScience, Faculty of Applied Sciences,
Delft University of Technology
, Lorentzweg 1, 2628 CJ Delft, The Netherlands
6Physics Department,
Moscow State Pedagogical University
, Moscow 119991, Russia
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J. J. A. Baselmans
J. J. A. Baselmans
4Faculty of Electrical Engineering, Mathematics and Computer Science, Terahertz Sensing Group,
Delft University of Technology
, Mekelweg 4, 2628 CD Delft, The Netherlands
7
SRON Netherlands Institute for Space Research
, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
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P. J. de Visser
1,a)
S. J. C. Yates
2
T. Guruswamy
3
D. J. Goldie
3
S. Withington
3
A. Neto
4
N. Llombart
4
A. M. Baryshev
2,5
T. M. Klapwijk
1,6
J. J. A. Baselmans
4,7
1Kavli Institute of NanoScience, Faculty of Applied Sciences,
Delft University of Technology
, Lorentzweg 1, 2628 CJ Delft, The Netherlands
2
SRON Netherlands Institute for Space Research
, Landleven 12, 9747AD Groningen, The Netherlands
3Cavendish Laboratory,
University of Cambridge
, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
4Faculty of Electrical Engineering, Mathematics and Computer Science, Terahertz Sensing Group,
Delft University of Technology
, Mekelweg 4, 2628 CD Delft, The Netherlands
5Kapteyn Astronomical Institute,
University of Groningen
, Landleven 12, 9747 AD Groningen, The Netherlands
6Physics Department,
Moscow State Pedagogical University
, Moscow 119991, Russia
7
SRON Netherlands Institute for Space Research
, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
a)
Electronic mail: [email protected]. Present address: Department of Quantum Matter Physics, University of Geneva, Geneva 1211, Switzerland.
Appl. Phys. Lett. 106, 252602 (2015)
Article history
Received:
May 22 2015
Accepted:
June 16 2015
Citation
P. J. de Visser, S. J. C. Yates, T. Guruswamy, D. J. Goldie, S. Withington, A. Neto, N. Llombart, A. M. Baryshev, T. M. Klapwijk, J. J. A. Baselmans; The non-equilibrium response of a superconductor to pair-breaking radiation measured over a broad frequency band. Appl. Phys. Lett. 22 June 2015; 106 (25): 252602. https://doi.org/10.1063/1.4923097
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