Study on terahertz emission and optical/terahertz pulse responses with superconductors

Abstract

Recent progress in terahertz technology has enabled precise investigation of the ultrafast dynamics of excited carriers, nonequilibrium state and nonlinear response of superconductors, resulting in the proposal of novel optoelectronic device applications based on such ultrafast perturbation of supercarriers in the terahertz frequency region. In this paper, we focus on exploratory research in the field of superconductor terahertz science and technology, and present a review of superconducting terahertz sources and the response of superconductors excited by ultrashort electromagnetic pulses, including optical pulses and high-intensity THz pulses.

Tunable Broadband Radiation Generated Via Ultrafast Laser Illumination of an Inductively Charged Superconducting Ring

“…In general the isolated peaks in the microwave spectrum contrasts with the broad THz spectrum generated by ~ps switching in sub-millimeter, photo-induced superconducting devices689. If the microwave spectrum were merely the tail end of a broader THz spectrum, we would expect to see a steady signal increase with frequency in both the 1–18 and 18–40 GHz measurements, but this was not observed.…”

“…Integrating a superconducting photo-switch together with a superconducting antenna (typically millimeters in dimension or less) has been shown to generate THz UWB radiation689. In both of these cases, the power is provided by an external power supply directly wired to the antenna.…”

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

“…1,2 In terms of compact solid state devices, THz quantum cascade lasers (QCLs) are good oscillators for frequencies above 2 THz, 3 while intrinsic Josephson junction (IJJ) stacks show good performance at sub-THz frequencies, typically between 0.4 and 0.8 THz. 4,5 In order to bridge the THz gap, the semiconducting QCLs have to move downwards with their operation frequencies and the superconducting IJJs emitters have to go to the opposite direction. Very interestingly, in both cases, the main challenge is to overcome the self-heating caused by the applied dc power.…”

Terahertz Emission Functionality of High‐Temperature Superconductors and Similar Complex Systems

“…[30] Copyright 1996, IOP Publishing. Further studies will open the direction for superconductor photonics such as optical memories, [45] optical interfaces to the superconductor circuits, [46] and new transient quantum physics. [44] It is possible to roughly estimate that the bundle includes several hundred vortices.…”

“…[40][41][42][43][44][45][46][47][48][49][50][51][52][53][54] Such a rare combination of the enormous potential for real-time technological applications and the richness of a wide range of physical phenomena caught the attention of the condensed matter community. Following the unparalleled excitement of high T c superconductors, the colossal magnetoresistive (CMR) manganites of type R 1−x A X MnO 3 (R = rare-earth cations, A = divalent cations) were the next major area of research for two reasons.…”