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Title: Radiation comb generation with extended Josephson junctions

We propose the implementation of a Josephson radiation comb generator based on an extended Josephson junction subject to a time dependent magnetic field. The junction critical current shows known diffraction patterns and determines the position of the critical nodes when it vanishes. When the magnetic flux passes through one of such critical nodes, the superconducting phase must undergo a π-jump to minimize the Josephson energy. Correspondingly, a voltage pulse is generated at the extremes of the junction. Under periodic driving, this allows us to produce a comb-like voltage pulses sequence. In the frequency domain, it is possible to generate up to hundreds of harmonics of the fundamental driving frequency, thus mimicking the frequency comb used in optics and metrology. We discuss several implementations through a rectangular, cylindrical, and annular junction geometries, allowing us to generate different radiation spectra and to produce an output power up to 10 pW at 50 GHz for a driving frequency of 100 MHz.
Authors:
 [1] ;  [1] ;  [2] ;  [3]
  1. SPIN-CNR, Via Dodecaneso 33, 16146 Genova (Italy)
  2. (Italy)
  3. NEST, Instituto Nanoscienze-CNR and Scuola Normale Superiore, I-56127 Pisa (Italy)
Publication Date:
OSTI Identifier:
22489489
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CRITICAL CURRENT; DIFFRACTION; ELECTRIC POTENTIAL; GEOMETRY; GHZ RANGE 01-100; HARMONICS; JOSEPHSON JUNCTIONS; MAGNETIC FIELDS; MAGNETIC FLUX; MHZ RANGE; OPTICS; PERIODICITY; PULSES; SPECTRA; TIME DEPENDENCE TUNNEL JUNCTIONS