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Journal articles on the topic 'Nonlinear terahertz conductivity'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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1

XU, X. G., and J. C. CAO. "NONLINEAR RESPONSE INDUCED STRONG ABSORPTANCE OF GRAPHENE IN THE TERAHERTZ REGIME." Modern Physics Letters B 24, no. 21 (2010): 2243–49. http://dx.doi.org/10.1142/s0217984910024626.

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We have calculated the fifth-order nonlinear optical response at experimentally relevant field strengths within the model of massless Dirac fermions by coupling the massless Dirac fermions to the time-dependent electric field quantum mechanically. It demonstrates that the fifth-order nonlinear optical response plays an important role in the contribution to the optical conductivity of pristine single-layer graphene in the low frequency part of the terahertz regime. The nonlinear effect can enhance the optical activity of single-layer graphene in the terahertz regime and significantly decreases

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2

Li, Quan, Shuang Wang, and Tai Chen. "Nonlinear Modulation of Plasmonic Resonances in Graphene-Integrated Triangular Dimers at Terahertz Frequencies." Materials 12, no. 15 (2019): 2466. http://dx.doi.org/10.3390/ma12152466.

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Metamaterials made from artificial subwavelength structures hold great potential in designing functional devices at microwave, terahertz, infrared, and optical frequencies. In this work, we study the active switching effect of the plasmonic resonance modes in triangular dimer (DTD) structure using graphene in the terahertz regime. The sole DTD structure can only support a dipolar bonding dimer plasmonic (BDP) mode, whose field enhancement factor at the gap center can reach 67.4. However, with a metallic junction in the dimer, the BDP mode switches to a charge transfer plasmonic (CTP) mode. Whe

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3

Zhong, Y., W. Feng, Zheng Liu, C. Zhang, and J. C. Cao. "Nonlinear optical conductivity of Weyl semimetals in the terahertz regime." Physica B: Condensed Matter 555 (February 2019): 81–84. http://dx.doi.org/10.1016/j.physb.2018.11.051.

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4

SHOROKHOV, ALEXEY V., and KIRILL N. ALEKSEEV. "THEORETICAL BACKGROUNDS OF NONLINEAR THz SPECTROSCOPY OF SEMICONDUCTOR SUPERLATTICES." International Journal of Modern Physics B 23, no. 20n21 (2009): 4448–58. http://dx.doi.org/10.1142/s0217979209063584.

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We consider terahertz absorption and gain in a single miniband of semiconductor superlattice subject to a bichromatic electric field in the most general case of commensurate frequencies of the probe and pump fields. Using an exact solution of Boltzmann transport equation, we show that in the small-signal limit the formulas for absorption always contain two distinct terms related to the parametric and incoherent interactions of miniband electrons with the alternating pump field. It provides a theoretical background for a control of THz gain without switching to the negative differential conduct

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5

Kang, Ji-Hun, Dai-Sik Kim, and Minah Seo. "Terahertz wave interaction with metallic nanostructures." Nanophotonics 7, no. 5 (2018): 763–93. http://dx.doi.org/10.1515/nanoph-2017-0093.

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AbstractUnderstanding light interaction with metallic structures provides opportunities of manipulation of light, and is at the core of various research areas including terahertz (THz) optics from which diverse applications are now emerging. For instance, THz waves take full advantage of the interaction to have strong field enhancement that compensates their relatively low photon energy. As the THz field enhancement have boosted THz nonlinear studies and relevant applications, further understanding of light interaction with metallic structures is essential for advanced manipulation of light th

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6

Demsar, Jure, Richard D. Averitt, Antoinette J. Taylor, et al. "Photoinduced Conductivity Dynamics Studies of MgB2 Thin Films." International Journal of Modern Physics B 17, no. 18n20 (2003): 3675–81. http://dx.doi.org/10.1142/s0217979203021605.

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We present the first direct studies of photoinduced Cooper-pair breaking and subsequent superconducting state recovery dynamics by means of femtosecond time-resolved optical-pump terahertz probe spectroscopy focusing on the superconducting state recovery dynamics in MgB 2. The superconducting state recovery proceeds on the timescale of several hundred picoseconds and shows a strong temperature dependence. In particular, upon increasing the temperature the recovery time first decreases, reaches a minimum, followed by a quasi-divergence upon further increasing the temperature towards Tc. Moreove

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7

Teng, Da, Kai Wang, and Zhe Li. "Graphene-Coated Nanowire Waveguides and Their Applications." Nanomaterials 10, no. 2 (2020): 229. http://dx.doi.org/10.3390/nano10020229.

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In recent years, graphene-coated nanowires (GCNWs) have attracted considerable research interest due to the unprecedented optical properties of graphene in terahertz (THz) and mid-infrared bands. Graphene plasmons in GCNWs have become an attractive platform for nanoscale applications in subwavelength waveguides, polarizers, modulators, nonlinear devices, etc. Here, we provide a comprehensive overview of the surface conductivity of graphene, GCNW-based plasmon waveguides, and applications of GCNWs in optical devices, nonlinear optics, and other intriguing fields. In terms of nonlinear optical p

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8

Singh, Ranjan, Jie Xiong, Abul K. Azad, et al. "Optical tuning and ultrafast dynamics of high-temperature superconducting terahertz metamaterials." Nanophotonics 1, no. 1 (2012): 117–23. http://dx.doi.org/10.1515/nanoph-2012-0007.

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AbstractThrough the integration of semiconductors or complex oxides into metal resonators, tunable metamaterials have been achieved by a change of environment using an external stimulus. Metals provide high conductivity to realize a strong resonant response in metamaterials; however, they contribute very little to the tunability. The complex conductivity in high-temperature superconducting films is highly sensitive to external perturbations, which provides new opportunities in achieving tunable metamaterials resulting directly from the resonant elements. Additionally, superconducting metamater

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9

Che, Yong-Li, Xiao-Long Cao, and Jian-Quan Yao. "Tunable and switchable resonance in optically-controlled nested metamaterials at terahertz frequencies." Modern Physics Letters B 30, no. 03 (2016): 1650011. http://dx.doi.org/10.1142/s0217984916500111.

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The asymmetrical nested metamaterial, composed of two split-ring resonators (SRRs) and two embedded gallium arsenide (GaAs) islands placed in the two SRRs, has been elaborately designed on quartz substrate. Its tunable and switchable resonances at terahertz (THz) frequencies are numerically demonstrated here based on different conductivities of GaAs, which can be transformed from semiconductor to metallic state through appropriate optical excitation. Without photoexcitation, our designed metamaterial has three resonance peaks in the range of monitored frequency range, and they are located at 0

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10

Liu, Zheng, Matthew Sanderson, Chao Zhang, and J. C. Cao. "Nonlinear optical conductivity of bilayer graphene with Rashba spin-orbit interaction in the terahertz regime." Journal of Applied Physics 118, no. 4 (2015): 043106. http://dx.doi.org/10.1063/1.4927512.

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11

BLUDOV, YU V., AIRES FERREIRA, N. M. R. PERES, and M. I. VASILEVSKIY. "A PRIMER ON SURFACE PLASMON-POLARITONS IN GRAPHENE." International Journal of Modern Physics B 27, no. 10 (2013): 1341001. http://dx.doi.org/10.1142/s0217979213410014.

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We discuss the properties of surface plasmons-polaritons in graphene and describe four possible ways of coupling electromagnetic radiation in the terahertz (THz) spectral range to this type of surface waves: (i) the attenuated total reflection (ATR) method using a prism in the Otto configuration, (ii) graphene micro-ribbon arrays or monolayers with modulated conductivity, (iii) a metal stripe on top of the graphene layer, and (iv) graphene-based gratings. The text provides a number of original results along with their detailed derivation and discussion.

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12

Ghayoor, Reza, and Alireza Keshavarz. "Transmission Properties of the Periodic Structures Based on Graphene Nonlinear Optical Conductivity in a Terahertz Field." International Journal of Optics and Photonics 13, no. 1 (2019): 35–42. http://dx.doi.org/10.29252/ijop.13.1.35.

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13

Tang, Chao, Qingshan Niu, Yuanhao He, Huaxin Zhu, Ben-Xin Wang, and Xiangyang Zhang. "High-Q terahertz Fano-like resonance effect based on robust metamaterial resonator." Modern Physics Letters B 33, no. 21 (2019): 1950248. http://dx.doi.org/10.1142/s0217984919502488.

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It is well known that Fano effect usually requires the introduction of asymmetric (or breaking) in their structure designs. The smaller the degree of breaking, the more obvious the Fano effect. However, the small degree of breaking demands extremely precise manufacturing capabilities and levels. This paper proposes a novel robust metallic array structure that can achieve a Fano-like effect with a high [Formula: see text]-factor as 73, consisting of a square patch and a closed-ring resonator. This distinct Fano-like resonance originates from the interactions of quadrupole resonance mode and dip

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14

Ye, Yunyang, Jiao Tang, Zhiwei Zheng, et al. "Tunable Low Threshold Optical Tristability at Terahertz Frequencies via a Pair of Parallel Graphene Layers’ Configuration." Advances in Condensed Matter Physics 2018 (September 18, 2018): 1–6. http://dx.doi.org/10.1155/2018/5679759.

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We investigate theoretically the optical tristability of transmission at a pair of parallel graphene layers system. We discuss the influence of the graphene sheets on the hysteretic response of the TE-polarized transmitted light. It is demonstrated that the optical tristability in this configuration can be realized due to the giant third-order nonlinear conductivity of graphene and appropriate structure parameters. The tristable behavior of the transmitted light can be controlled via suitably varying the Fermi energy of the graphene. Besides, the optical tristable behavior is strongly dependen

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15

Maeng, Inhee, Seongchu Lim, Seung Jin Chae, Young Hee Lee, Hyunyong Choi, and Joo-Hiuk Son. "Gate-Controlled Nonlinear Conductivity of Dirac Fermion in Graphene Field-Effect Transistors Measured by Terahertz Time-Domain Spectroscopy." Nano Letters 12, no. 2 (2012): 551–55. http://dx.doi.org/10.1021/nl202442b.

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16

PATANÈ, A. "NEGATIVE DIFFERENTIAL VELOCITY IN ARTIFICIAL CRYSTALS PROBED BY HIGH MAGNETIC FIELDS." International Journal of Modern Physics B 23, no. 12n13 (2009): 2766–68. http://dx.doi.org/10.1142/s0217979209062335.

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Progress in the synthesis and engineering of semiconductor materials has led to improved device performances and functionalities. In particular, in the last decade, there has been considerable interest in the physics and applications of highly-mismatched alloys in which small and highly-electronegative isovalent N -atoms are incorporated onto the anion sublattice of a III-V compound semiconductor.1 The most studied material is the GaAs 1-x N x alloy. Our magnetotunnelling studies have shown that a small percentage of N (x < 1%) perturbs dramatically the electronic properties of the host GaA

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17

Kozhitov, L. V., A. V. Shadrinov, D. G. Muratov, E. Yu Korovin, and A. V. Popkova. "Electromagnetic and mechanical properties of nanocomposites polyacrylonitrile/carbon nanotubes." Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering 20, no. 3 (2017): 206–12. http://dx.doi.org/10.17073/1609-3577-2017-3-206-212.

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The films of carbon-polymer nanocomposite PAN/SWCNT with different filler concentrations, varying from 0.5 to 30 wt.%, are synthesized. It found that the use of fillers in the polymer composite on the basis of PAN, in the form of SWNTs, significantly affects the mechanical properties of the polymer, in particular, the tensile strength increases. The study of electrophysical properties showed that when SWNT fillers are introduced from 0.5 to 30 wt.%, the electrical conductivity increases by 2 orders of magnitude due to the increase in the percolation degree and by 7 orders of magnitude in compa

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18

Liu, Yangqi, Xiang Li, Tingting Yang, et al. "Mechanism of terahertz reflection enhancement on photo-excited MEH-PPV/PEDOT:PSS/Si hybrid structure." Modern Physics Letters B, August 13, 2021, 2150457. http://dx.doi.org/10.1142/s0217984921504571.

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The mechanism of enhanced reflection of terahertz wave via photoexcitation of a poly[2-methoxy-5-(2[Formula: see text]-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV)/poly(3-ethylenedioxythiophene):poly(4-styrene sulfonate) (PEDOT:PSS) hybrid structure on silicon is reported. The reflectivity and incident angles measured for different samples conform to Brewster’s law. When the sample was excited by a continuous wave 450 nm laser at two randomly selected angles, the reflectivity of sample increased. According to the Fresnel equations, this phenomenon is related to the conductivity and refracti

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19

Litvinov, Vladimir, and Alexander Manasson. "High-Frequency Generation in Low-Mobility Superlattices." MRS Proceedings 831 (2004). http://dx.doi.org/10.1557/proc-831-e11.9.

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ABSTRACTWe study the transport properties of miniband electrons in an electromagnetic field as related to the high-frequency generation in a semiconductor superlattice (SL). We study the regimes where the external ac-field is in resonance and out of resonance with the two lowest SL minibands.In the diffusive quasi-static regime Bloch oscillations and electrical domains do not develop and high-frequency generation may occur as a result of the negative high-harmonic nonlinear conductivity. This regime is different from the frequency conversion in a stable nonlinear media. We point out that AlGaN

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20

Ang, Yee Sin, J. C. Cao, and Chao Zhang. "Nonlinear optical conductivity of two-dimensional semiconductors with Rashba spin-orbit coupling in terahertz regime." European Physical Journal B 87, no. 2 (2014). http://dx.doi.org/10.1140/epjb/e2014-41015-8.

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21

Xu, Haowei, Hua Wang, Jian Zhou, Yunfan Guo, Jing Kong, and Ju Li. "Colossal switchable photocurrents in topological Janus transition metal dichalcogenides." npj Computational Materials 7, no. 1 (2021). http://dx.doi.org/10.1038/s41524-021-00499-4.

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AbstractNonlinear optical properties, such as bulk photovoltaic effects, possess great potential in energy harvesting, photodetection, rectification, etc. To enable efficient light–current conversion, materials with strong photo-responsivity are highly desirable. In this work, we predict that monolayer Janus transition metal dichalcogenides (JTMDs) in the 1T′ phase possess colossal nonlinear photoconductivity owing to their topological band mixing, strong inversion symmetry breaking, and small electronic bandgap. 1T′ JTMDs have inverted bandgaps on the order of 10 meV and are exceptionally res

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22

Ni, Zhuoliang, B. Xu, M. Á. Sánchez-Martínez, et al. "Linear and nonlinear optical responses in the chiral multifold semimetal RhSi." npj Quantum Materials 5, no. 1 (2020). http://dx.doi.org/10.1038/s41535-020-00298-y.

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AbstractChiral topological semimetals are materials that break both inversion and mirror symmetries. They host interesting phenomena such as the quantized circular photogalvanic effect (CPGE) and the chiral magnetic effect. In this work, we report a comprehensive theoretical and experimental analysis of the linear and nonlinear optical responses of the chiral topological semimetal RhSi, which is known to host multifold fermions. We show that the characteristic features of the optical conductivity, which display two distinct quasi-linear regimes above and below 0.4 eV, can be linked to excitati

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23

Okamura, Y., S. Minami, Y. Kato, et al. "Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2." Nature Communications 11, no. 1 (2020). http://dx.doi.org/10.1038/s41467-020-18470-0.

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Abstract The Weyl semimetal (WSM), which hosts pairs of Weyl points and accompanying Berry curvature in momentum space near Fermi level, is expected to exhibit novel electromagnetic phenomena. Although the large optical/electronic responses such as nonlinear optical effects and intrinsic anomalous Hall effect (AHE) have recently been demonstrated indeed, the conclusive evidence for their topological origins has remained elusive. Here, we report the gigantic magneto-optical (MO) response arising from the topological electronic structure with intense Berry curvature in magnetic WSM Co3Sn2S2. The

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