Engineering and characterization of a packaged high-T_csuperconducting terahertz source module

Abstract

We present an effective engineering technique for compactly packaging high-T c superconducting continuous-wave terahertz source modules. A terahertzemitting device, which consists of stacks of intrinsic Josephson junctions in single crystalline Bi 2 Sr 2 CaCu 2 O 8+δ , bias electrodes, a collimating lens, and other components, is packaged into a single finger-sized assembly. The rigid and stable structure used for the packaging guarantees physical and chemical stability with good thermal contact, and provides reproducible characteristics with a high yield rate. The coherent terahertz waves can be emitted from the back side of the base crystal without significant screening. The intuitive results obtained from the numerical simulation are consistent with the observed thermal properties. The modules are easy to use, and thus intended for all users unfamiliar with superconducting electronic devices.

Monolithic Superconducting Emitter of Tunable Circularly Polarized Terahertz Radiation

“…The highest degree of circular polarization (DOCP) recorded in the study proposed herein is 99.7%, which is higher than that recorded by state-of-the-art quantum cascade lasers used for obtaining circular polarization [9,10,27]. As circularly polarized THz waves could be employed in a wide variety of potential applications, the result obtained in this study, along with recently reported packaging [28] and demonstration of THz torch [29], it is believed, will significantly influence and inspire the development of practical applications of IJJ-based THz emission devices [4,30].…”

Terahertz Radiations and Switching Phenomena of Intrinsic Josephson Junctions in High-Temperature Superconductors: Josephson Phase Dynamics in Long- and Short-Ranged Interactions

“…This result was reproduced in numerical simulations, which revealed that an excessive temperature rise on the device surface suppresses the radiation intensity [30]. This means that efficient cooling of the high-temperature superconducting THz source improves the radiation intensity, which will lead to the realization of high-power THz sources [46].…”

Integrated, Portable, Tunable, and Coherent Terahertz Sources and Sensitive Detectors Based on Layered Superconductors

“…In making these devices portable and user-friendly for various applications, Tsujimoto et al developed techniques for engineering of these devices and demonstrated a sub-centimeter sized THz source module [95]. They manufactured a portable and compact THz emitter device, which consists of an IJJ THz laser device, circuit bias electrodes, a collimating lens, and related apparatuses, all of which were wrapped into a single finger-sized assembly.…”

“…The sub-centimeter (finger-tip) dimension IJJ THz source modules with high yield, efficient thermal conductivity, and both physical and chemical stabilities demonstrated in this study suggest its ease of operation as a portable THz source. The module only requires a current I < 30 mA and a voltage V= 1.5 V to operate, just like a quantum THz torch, paving the way for its practical usage and integration in various types of THz system and set up [81,86,95]. An example of a THz setup with an IJJ emitter as a circularly polarized THz light source is shown in Fig.…”