Publisher’s Note: Coherent Terahertz Emission of Intrinsic Josephson Junction Stacks in the Hot Spot Regime [Phys. Rev. Lett.<b>105</b>, 057002 (2010)]

Wang, H. B.; Guénon, Stefan; Gross, B.; Yuan, John; Jiang, Zhou; Zhong, Yan; Gruenzweig, Matthias; Iishi, A.; Wu, Peiheng; Hatano, Takeshi; Koelle, D.; Kleiner, R.

doi:10.1103/physrevlett.105.069902

Cited by 35 publications

(91 citation statements)

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“…2,5,8,21 The thickness of the superconducting CuO 2 layer of the Bi2212 single crystal is an atomic scale (∼3Å) and comparable to a charge screening length. Hence, the phase differences between the IJJs interact with each other through the electric fields, which perpendicularly penetrate the junctions, and the phase synchronization will occur to keep the charge neutrality of the junctions.…”

Section: Calculation Methodsmentioning

confidence: 99%

“…The I -V curves of the Bi2212 mesa show negative resistance in a large current region due to the joule heating, and the reversible type of emission has been reported in this region. 2,5,8,21 Here we assume that the electric field parallel to the IJJ plane is negligibly small (E x = E y = 0) and the applied magnetic field is zero. In the above equations, we use dimensionless quantities as follows:…”

Section: Calculation Methodsmentioning

confidence: 99%

“…The appearance of such hot spots whose positions are asymmetric with respect to the center of the mesas have been already reported in previous experimental studies. [20][21][22] …”

Section: Calculation Methodsmentioning

confidence: 99%

“…Moreover, the radiation patterns emitted by inhomogeneous samples have not been investigated in previous studies. Recently, Wang et al have reported the appearance of hot spots where the temperature is locally high, [20][21][22] and these inhomogeneities are considered to affect the emission from the IJJs.…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional numerical analysis of terahertz radiation emitted from intrinsic Josephson junctions with hot spots

2012

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In this study, we numerically investigate the terahertz radiation from mesa-structured intrinsic Josephson junctions (IJJs) using a three-dimensional calculation model. We assume an in-phase mode of the phase differences and calculate electromagnetic fields inside and outside of the IJJs simultaneously. We consider the appearance of a hot spot in the mesa where j c locally decreases and investigate the change of the radiation power with varying hot-spot positions. The radiation powers for three different hot-spot positions are calculated as functions of voltage. We observe strong radiation when the ac Josephson frequency satisfies the cavity resonance condition. Transverse-magnetic modes TM m,n whose indices m and n are even appear regardless of the positions of hot spots. Meanwhile, the TM m,n cavity modes whose m or n are odd appear only when the hot spots break the reflectional symmetry of the mesa structure. Moreover, we calculate the radiation patterns emitted by the IJJs at these cavity resonance conditions. The radiation patterns reflect the existence of two types of internal modes, that is, a uniform background mode and a cavity resonance mode.

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Section: Calculation Methodsmentioning

confidence: 99%

Section: Calculation Methodsmentioning

confidence: 99%

“…The appearance of such hot spots whose positions are asymmetric with respect to the center of the mesas have been already reported in previous experimental studies. [20][21][22] …”

Section: Calculation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Three-dimensional numerical analysis of terahertz radiation emitted from intrinsic Josephson junctions with hot spots

2012

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“…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.…”

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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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An Effective Method for Improving Emissions from Intrinsic Josephson Junction Arrays of Misaligned Tl2Ba2CaCu2O8+δ Thin Films

Wang

Fan

Wang

et al. 2012

J Supercond Nov Magn

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In this paper, an effective method for improving emissions from Josephson junction arrays was proposed. We took the substrate as a dielectric resonance antenna to improve the coupling of intrinsic junctions to electromagnetic waves. Electromagnetic simulations were performed in parallel with experiment investigations. Sharp radiation peaks at 76.9 GHz were detected from intrinsic Josephson junction arrays in misaligned Tl 2 Ba 2 CaCu 2 O 8+δ thin films at 78 K. Experimental results proved the effectiveness of this method, which offered a competitive choice for coherent emission from intrinsic Josephson junction arrays.

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Publisher’s Note: Coherent Terahertz Emission of Intrinsic Josephson Junction Stacks in the Hot Spot Regime [Phys. Rev. Lett.105, 057002 (2010)]

Cited by 35 publications

References 0 publications

Three-dimensional numerical analysis of terahertz radiation emitted from intrinsic Josephson junctions with hot spots

Three-dimensional numerical analysis of terahertz radiation emitted from intrinsic Josephson junctions with hot spots

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

An Effective Method for Improving Emissions from Intrinsic Josephson Junction Arrays of Misaligned Tl2Ba2CaCu2O8+δ Thin Films

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