Emission of terahertz-frequency electromagnetic radiation from bulk<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ga</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>In</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mtext>As</mml:mtext></mml:mrow></mml:math>crystals

Ko, Youngok; Sengupta, Suranjana; Tomasulo, Stephanie; Dutta, P.S.; Wilke, Ingrid

doi:10.1103/physrevb.78.035201

Cited by 26 publications

(22 citation statements)

References 50 publications

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“…Chimeras have been successfully verified in experiments, including optical [41], chemical [42,43], mechanical [44,45], electronic and optoelectronic [46,47] and electrochemical oscillator networks [48][49][50]. Further, the robustness of chimera states has been demonstrated in networks of inhomogeneous oscillators [51], or with irregular topologies [9,34,39,[52][53][54][55][56][57][58][59].…”

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confidence: 99%

Relay synchronization in multiplex networks of discrete maps

Winkler¹,

Sawicki²,

Omelchenko³

et al. 2019

EPL

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Complex multiplex networks consist of several subnetwork layers, which interact via pairwise inter-layer connections. Relay synchronization between distant layers which are not directly connected, but only via a relay layer, can be observed in multiplex networks. We study three-layer networks of discrete logistic maps, where each individual layer is a nonlocally coupled ring, and demonstrate scenarios of relay synchronization of complex patterns in the outer layers which interact via an intermediate layer. We find regimes of relay synchronization for chimera states, i.e., patterns of coexisting coherent and incoherent domains, and a transition from phase chimeras to amplitude chimeras for increasing inter-layer coupling. We determine analytically the approximate critical coupling strengths for the existence of phase chimeras.

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confidence: 99%

Relay synchronization in multiplex networks of discrete maps

Winkler¹,

Sawicki²,

Omelchenko³

et al. 2019

EPL

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“…Established mechanisms include the nonlinear optical effect of optical rectification ͑OR͒ and TC effects. Within the TC effects may be distinguished those that rely on a current surge ͑CS͒ due to drift of charge carriers in the surface field and those that involve the photo-Dember ͑PD͒ effect, 10,11 due to the different diffusion rates of holes and electrons away from the surface. While the CS saturates at high excitation fluences, the PD effect does not.…”

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confidence: 99%

Single-cycle azimuthal angle dependence of terahertz radiation from (100) n-type InP

Hargreaves

Lewis

2008

Applied Physics Letters

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We have observed that the terahertz power emitted by (100) n-type InP exhibits a single maximum and a single minimum as the crystal is rotated through 360° about its surface normal. This stands in contrast to other semiconductor terahertz emitters for which two, three, or four maxima per rotation have been observed. We have investigated the terahertz emission as a function of sample doping, optical excitation fluence, and applied in-plane magnetic field. The data cannot be accounted for by bulk optical rectification. We suggest that the origin of the phenomenon may be related to crystal twinning.

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“…Although the photo-Dember effect in bulk (100) InAs [6] is further enhanced with increased electron mobility accompanied by higher excess energy of photo-carriers, the second-order nonlinear effect becomes crucial in other crystal faces such as (110) and (111) plane [8]. Sometimes, the polycrystalline nature of inhomogeneous semiconductors shows the nonlinear emission from grain boundaries [9].…”

Section: Introductionmentioning

confidence: 98%

Directional terahertz emission from corrugated InAs structures

Yim¹,

Jeong²,

Irfan³

et al. 2013

Opt. Express

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The terahertz (THz) radiation from transient dipoles, formed by distinct diffusion coefficients between oppositely charged carriers as often observed in low band gap semiconductors, propagates with an anisotropic amplitude distribution perpendicular to the dipole axis along the diffusive motion. By directionally adjusting the electronic diffusion, we conceptualize groove-patterned THz emitters based on (100) InAs thin films and demonstrate the unidirectional radiation. Line-of-sight emission along the surface-normal direction is greatly enhanced in a distributed asymmetric trapezoid with its period similar to the electronic diffusion length of InAs. This directional enhancement is in clear contrast to the constant emission amplitude along the lateral direction, regardless of pattern scale, which manifests the role of groove patterns as microscale reflectors in laterally corrugating the carrier density. In contrast to the rather limited nonlinearity in (100) plane, the azimuthal angle dependence of the THz field amplitude in corrugated samples shows a combined effect of diffusive transport and second-order nonlinearity, whose compositional contributions varies in different structures.

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Emission of terahertz-frequency electromagnetic radiation from bulkGaxIn1−xAscrystals

Cited by 26 publications

References 50 publications

Relay synchronization in multiplex networks of discrete maps

Relay synchronization in multiplex networks of discrete maps

Single-cycle azimuthal angle dependence of terahertz radiation from (100) n-type InP

Directional terahertz emission from corrugated InAs structures

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