Cavity mode enhancement of terahertz emission from equilateral triangular microstrip antennas of the high-T_csuperconductor Bi₂Sr₂CaCu₂O_{8 +δ}

Abstract

We study the transverse magnetic (TM) electromagnetic cavity mode wave functions for an ideal equilateral triangular microstrip antenna (MSA) exhibiting C point group symmetry. When the C operations are imposed upon the antenna, the TM(m,n) modes with wave vectors [Formula: see text] are much less dense than commonly thought. The R operations restrict the integral n and m to satisfy [Formula: see text], where [Formula: see text] and [Formula: see text] for the modes even and odd under reflections about the three mirror planes, respectively. We calculate the forms of representative wave functions and the angular dependence of the output power when these modes are excited by the uniform and non-uniform ac Josephson current sources in thin, ideally equilateral triangular MSAs employing the intrinsic Josephson junctions in the high transition temperature T superconductor BiSrCaCu [Formula: see text], and fit the emissions data from an earlier sample for which the C symmetry was apparently broken.

Compact High- Tc Superconducting Terahertz emitter operating up to 86 K

“…Coherent off-chip * hbwang@nju.edu.cn terahertz emission was first demonstrated for 1-μm-thick BSCCO stacks, with an extrapolated output power of up to 0.5 μW for emission frequencies f e between 0.5 and 0.85 THz [6], and it has been proposed that resonant modes utilizing the stack as a cavity and oscillating along the width of the stack play an important role for synchronization. A variety of cavity resonances have indeed been found and analyzed [7][8][9]11,13,14,47,[62][63][64]. For the best stacks the detected terahertz power is now on the order of tens of microwatts [22,23,27,70], with a maximum value of 610 μW achieved by a synchronized three-mesa array [22].…”

Millimeter-Wave-to-Terahertz Superconducting Plasmonic Waveguides for Integrated Nanophotonics at Cryogenic Temperatures

“…The high-transition-temperature ( T c ) superconducting Bi 2 Sr 2 CaCu 2 O 8+δ (BSCCO) intrinsic Josephson junctions (IJJs)-based THz emitters radiate intense, coherent, and continuous THz photons with frequencies ranging from 0.1 to 11 THz [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. Such THz devices can also be used as surface current-sensitive detectors due to the unique electrodynamics of the BSCCO quantum material.…”

Engineering Circular Polarization in Chip-integrated High-Tc Superconducting THz Antennas

“…To further enhance THz radiation in intrinsic Josephson junctions (IJJs) high-superconducting BSCCO based devices [1,[21][22][23][24][25], we study regular pentagonal THz patch antennas. The pentagonal cavity is considered to be BSCCO with a feed point either at the centre or at the edge of the cavity, as shown in Fig.…”