Spectral measurements of THz radiation emitted from intrinsic Josephson junction stacks

V.P Koshelets,A.B Ermakov,R Wieland,D Koelle,F Rudau,R Kleiner,N.V Kinev,H.B Wang,A.A Silaev

doi:10.1051/epjconf/201819505013

Abstract

Spectral measurements of THz radiation emitted from intrinsic Josephson junction stacks

Highlights

Coherent THz emission has been obtained from stacks of intrinsic Josephson junctions (IJJs), created naturally in the BSCCO unit cell with the CuO layers forming the superconducting electrodes and the BiO and SrO layers forming the barrier layer [1, 2]; a 1- μm-thick crystal consists of about 670 IJJs
The spectral characteristics of the oscillator were studied using the high-sensitivity super-heterodyne superconducting integrated receiver (SIR), which was developed at Kotel’nikov IREE [9 12]. Such a receiver is intended to perform spectral studies of the electromagnetic radiation in the frequency range 450–700 GHz and successfully used for measuring the profiles of the spectral lines of the gasmolecule radiation and absorption and for the spectral study of any external terahertz oscillator radiating in the operation frequency range of the receiver
The best noise temperature of the SIR is 120 K and its spectral resolution is better than 0.1 MHz, which exceeds the resolution of modern terahertz-range Fourier spectrometers by several orders of magnitude

Summary

Introduction

Coherent THz emission has been obtained from stacks of intrinsic Josephson junctions (IJJs), created naturally in the BSCCO unit cell with the CuO layers forming the superconducting electrodes and the BiO and SrO layers forming the barrier layer [1, 2]; a 1- μm-thick crystal consists of about 670 IJJs. Such a receiver is intended to perform spectral studies of the electromagnetic radiation in the frequency range 450–700 GHz and successfully used for measuring the profiles of the spectral lines of the gasmolecule radiation and absorption and for the spectral study of any external terahertz oscillator radiating in the operation frequency range of the receiver.

Results

Conclusion