Xianjing Zhou

Bi2Sr2CaCu2O8 intrinsic Josephson junction stacks with improved cooling: Coherent emission above 1 THz

We report on Bi2Sr2CaCu2O8 (BSCCO) intrinsic Josephson junction stacks with improved cooling, allowing for a remarkable increase in emission frequency compared to the previous designs. We started with a BSCCO stack embedded between two gold layers. When mounted in the standard way to a single substrate, the stack emits in the range of 0.43–0.82 THz. We then glued a second, thermally anchored substrate onto the sample surface. The maximum voltage of this better cooled and dimension-unchanged sample was increased and, accordingly, both the emission frequencies and the tunable frequency range were significantly increased up to 1.05 THz and to 0.71 THz, respectively. This double sided cooling may also be useful for other “hot” devices, e.g., quantum cascade lasers.

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

We used one-dimensional coupled sine-Gordon equations combined with heat diffusion equations to numerically investigate the thermal and electromagnetic properties of a 300

Three-terminal stand-alone superconducting terahertz emitter

\ensuremath{\mu}\mathrm{m}

Three-Dimensional Simulations of the Electrothermal and Terahertz Emission Properties of Bi2Sr2CaCu2O8 Intrinsic Josephson Junction Stacks

long intrinsic Josephson junction stack consisting of

A power-adjustable superconducting terahertz source utilizing electrical triggering phase transitions in vanadium dioxide

N=700

Terahertz Waves Emission From Two Bi Sr CaCu O Mesas in Series

junctions. The junctions in the stack are combined with

Terahertz Waves Emission From Two

M

\hbox{Bi}_{2}\hbox{Sr}_{2} \hbox{CaCu }_{2} \hbox{O} _{8}

segments where we assume that inside a segment all junctions behave identically. Most simulations are for

Mesas in Series

M=20

High upper critical fields of superconducting Ca10(Pt4As8)(Fe1.8Pt0.2As2)5 whiskers

. For not too high bath temperatures there is the appearance of a hot spot at high-bias currents. In terms of electromagnetic properties, robust standing-wave patterns appear in the current density and electric field distributions. These patterns come together with vortex/antivortex lines across the stack that correspond to