Monolithic Superconducting Emitter of Tunable Circularly Polarized Terahertz Radiation

Elarabi, Asem; Yoshioka, Yusuke; Tsujimoto, Manabu; Kakeya, Itsuhiro

doi:10.1103/physrevapplied.8.064034

Cited by 34 publications

(21 citation statements)

References 44 publications

(71 reference statements)

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“…Elarabi et al later reported the first experimental demonstration of IJJ THz sources with the emission of CP THz waves, first from a monolithic THz source in which the ellipticity and evolution direction were tuned by the device geometry and voltage [81], and more recently from a cylindrical antenna [82]. Their highest degree of circular polarization (DOCP) from a monolithic IJJ THz emitter was 99.7%, which is considerably higher than that of QCLs [83][84][85].…”

Section: (Iv-iii) Polarization Control Of Ijj Thz Sourcesmentioning

confidence: 99%

“…Light emission with an axial ratio (AR), the ratio between the major and minor axes of the fitted polarization ellipse, less than 3 dB was attributed to a CP light. The CP THz wave emissions from these devices were obtained from the excitations of two transverse orthogonal modes along the major and minor diagonals [81,82]. The evolution of the polarization of the truncated-edge square antenna is plotted in Figs.…”

Section: (Iv-iii) Polarization Control Of Ijj Thz Sourcesmentioning

confidence: 99%

“…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.…”

Section: Packagingmentioning

confidence: 99%

“…An example of a THz setup with an IJJ emitter as a circularly polarized THz light source is shown in Fig. 17 [81].…”

Section: Packagingmentioning

confidence: 99%

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

et al. 2020

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At terahertz (THz) frequencies, between 0.1-10 THz, current compact emitter and receiver technologies are generally inefficient and impractical. Hence, a gap exists between mature microwave and developed optical technologies. On-chip, integrated broadly tunable and powerful quantum sources that coherently radiate THz waves between 0.1 and 11 THz (potentially extendable to 15 THz) and with potential output power of > 1 mW can be achieved based on quantum tunneling of electron pairs across the stack of intrinsic Josephson junctions (IJJs) naturally present in a single crystal of the layered high-Tc superconducting Bi2Sr2CaCu2O+ (BSCCO). Such devices have been found to be especially promising solid-state THz sources capable of bridging the entire THz gap, as their wide frequency tunability range is superior to that obtained from their semiconducting based rivals, either single resonant tunneling diodes (RTDs) or THz-quantum cascade lasers (QCLs). Due to the unique electrodynamics of BSCCO, they can also be operated as switching current detectors, paving the way for the realization of on-chip THz integrated circuits for applications in ultrahigh-speed telecommunications, quantum information, on-chip spectroscopy, and non-destructive sensing, testing, and imaging. This paper reviews the history and recent advances in THz sources and detectors based on IJJs with a focus on the application of IJJ THz devices in THz spectroscopy, and various types of THz imaging systems such as r eflection, transmission, and computed tomography. We show that compact IJJ THz devices with sub-centimeter-sized modules are easy to use in many applications, as they can be regarded as pocket quantum THz torches.

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Section: (Iv-iii) Polarization Control Of Ijj Thz Sourcesmentioning

confidence: 99%

Section: (Iv-iii) Polarization Control Of Ijj Thz Sourcesmentioning

confidence: 99%

Section: Packagingmentioning

confidence: 99%

“…An example of a THz setup with an IJJ emitter as a circularly polarized THz light source is shown in Fig. 17 [81].…”

Section: Packagingmentioning

confidence: 99%

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

et al. 2020

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“…Furthermore, we revealed that the ellipticity and handedness of the THz waves change dramatically with the heating position. Recently, emissions of circularly polarized THz wave were experimentally reported from a truncated-edge square mesa [30], and their characteristics were investigated with a simple antenna analysis [31]. In the truncated-edge mesa, the cavity modes along two diagonal lines of the mesa will become eigenmodes.…”

mentioning

confidence: 99%

Control of circularly polarized THz wave from intrinsic Josephson junctions by local heating

Asai

Kawabata

2017

Applied Physics Letters

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This paper reports a practical method of generating circularly polarized terahertz (THz) waves from intrinsic Josephson junctions (IJJs) and controlling their polarization states by external local heating. We theoretically find that a mesa-structure IJJ whose geometry is almost square can emit circularly polarized THz waves by local heating of the mesa. Moreover, we demonstrate that the polarization states of the THz waves change dramatically with the local heating position. Our results indicate that the use of local heating can provide a high level of controllability of the THz emissions and significantly extend the range of applications of IJJ-based THz emitters.Terahertz (THz) electromagnetic (EM) waves have potential applications in a wide range of fields, e.g. nondestructive inspection of materials, medical diagnosis, bio-sensing, and high-speed wireless communication [1]. Toward the realization of a practical THz emitter, various THz sources, such as quantum-cascade lasers and resonant-tunneling diodes, have been studied so far [2,3]. Since the first observation of intense and continuous THz wave emitted from a Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212) single crystal by Ozyuzer et al. [4], considerable attention has been paid to high-T c cuprate superconductors. A layered structure of Bi2212 single crystals composed of superconducting layers and insulating layers forms a stack of the Josephson junctions whose thicknesses are on the atomic scale ∼ 1.5 nm. Stacks of these natural Josephson junctions, which are referred to as intrinsic Josephson junctions (IJJs), can generate an AC Josephson current in the THz frequency range by application of a voltage, and the THz wave emission is attributed to the generation of this current. Intense THz emissions have been reported for IJJs fabricated in a mesa geometry, which itself behaves as a cavity resonator, and thus, a number of studies on such IJJ mesas have been carried out both experimentally [4][5][6][7][8][9][10][11][12][13][14][15] and theoretically [16][17][18][19][20][21][22][23][24][25][26]. However, in the previous studies, little attention was given to the state of the polarization of the THz waves. Control of the polarization is a fundamental issue for technological applications of THz waves. In particular, the ability to generate and control circularly polarized THz waves would open the way to various applications such as circular dichroism of proteins [27].In this paper, we present a method of generating and controlling circularly polarized THz waves from IJJ mesas by using external local heating. We consider a IJJ mesa whose geometry is almost square and whose temperature distribution is controlled by laser heating (see Fig. 1). We numerically investigate the emission power and the polarization of the THz waves from the mesa by solving the sine-Gordon and the Maxwell equations simultaneously. Interestingly, both the ellipticity and handedness of the THz waves from the IJJ mesa strongly depend on the position of the laser heating. Figure 1 shows a schematic fig...

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A compact antenna structure for circular polarized terahertz radiation

Shalini

Madhan

2021

Optik

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Monolithic Superconducting Emitter of Tunable Circularly Polarized Terahertz Radiation

Cited by 34 publications

References 44 publications

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

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

Control of circularly polarized THz wave from intrinsic Josephson junctions by local heating

A compact antenna structure for circular polarized terahertz radiation

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