THz emission from a stacked coherent flux-flow oscillator: non-local radiative boundary conditions and the role of geometrical resonances

Abstract

I derive simple non-local dynamic boundary conditions, suitable for modelling of radiation emission from stacked Josephson junctions, and employ them for analysis of flux-flow emission from intrinsic Josephson junctions in high-$T_c$ superconductors. It is shown that due to the lack of Lorenz contraction of fluxons in stacked junctions, high quality geometrical resonances are prerequisite for high power emission from the stack. This leads to a dual role of the radiative impedance: on the one hand, small impedance increases the efficiency of emission from the stack, on the other hand, enhanced radiative losses reduce the quality factor of geometrical resonances, which may decrease the total emission power. Therefore, the optimal conditions for the coherent flux-flow oscillator are achieved when radiative losses are comparable to resistive losses inside the stack.

arXiv comment4 pages, 2 figures

References in corpus (12)

• Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear, and quantum phenomena
• Radiation Due to Josephson Oscillations in Layered Superconductors
• Collective Dynamics of Josephson Vortices in Intrinsic Josephson Junctions :Exploration of In-phase Locked Superradiant Vortex Flow States
• Josephson-vortex-flow terahertz emission in layered high-$T_c$ superconducting single crystals
• Phase dynamics of inductively coupled intrinsic Josephson junctions and terahertz electromagnetic radiation
• Interlayer tunneling spectroscopy of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$: a look from inside on the doping phase diagram of high $T_c$ superconductors
• Temperature dependence of the bulk energy gap in underdoped Bi-2212: Evidence for the mean-field superconducting transition
• Nonlinear nonequilibrium quasiparticle relaxation in Josephson junctions
• In-plane fluxon in layered superconductors with arbitrary number of layers
• Observation of superluminal geometrical resonances in Bi2Sr2CaCu2O8+x intrinsic Josephson junctions
• Stabilization of in-phase fluxon state by geometrical confinement in small Bi-2212 mesa structures
• Electrodynamics of Josephson vortex lattice in high-temperature superconductors

Cited by in corpus (17)

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• Hot-spot formation in stacks of intrinsic Josephson junctions in Bi2Sr2CaCu2O8
• THz emission from intrinsic Josephson junctions at zero magnetic field via breather auto-oscillations
• Superconducting THz sources with 12% power efficiency
• Thermal and electromagnetic properties of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_8$ intrinsic Josephson junction stacks studied via one-dimensional coupled sine-Gordon equations
• 3D simulations of the electrothermal and THz emission properties of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_8$ intrinsic Josephson junction stacks
• Synchronization of One Dimensional Array of Point Josephson Junctions Coupled to a Common Load
• Direct visualization of phase-locking of large Josephson junction arrays by surface electromagnetic waves
• Observation of polaritons in Bi2Sr2CaCu2O8+x single crystals
• Temperature dependence of geometrical and velocity matching resonances in Bi2Sr2CaCu2O8+x intrinsic Josephson junctions
• Optimal Condition for Strong Terahertz Radiation from Intrinsic Josephson Junctions
• Design aspects of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ THz sources: optimization of thermal and radiative properties
• Radiative annihilation of a soliton and an antisoliton in the coupled sine-Gordon equation
• Resonant switching current detector based on underdamped Josephson junctions
• Terahertz emission from mutually synchronized standalone Bi2Sr2CaCu2O8+x intrinsic-Josephson-junction stacks
• Strong polaritonic interaction between flux-flow and phonon resonances in Bi2Sr2CaCu2O8+x intrinsic Josephson junctions: Angular dependence and the alignment procedure
• A distributed, active patch antenna model of a Josephson oscillator