Modulation of dielectric properties of KTaO_3 in terahertz region via 532nm continuous-wave laser

Wu, Liang; Li, H.; Jiang, Lei; Ding, Chunfeng; Sheng, Quan; Ding, Xin; Yao, Jianquan

doi:10.1364/ome.4.002595

Cited by 10 publications

(8 citation statements)

References 16 publications

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“…Compared to our previous work 13 , the new structure, delivering a modulation depth of more than 17% for absorption loss, greatly enhanced the dielectric tunability of the KTO crystal. Figure 3(c) shows simulated electric field distribution of the LC resonator structure at resonance frequency using CST Microwave studio frequency-domain solver.…”

Section: Resultsmentioning

confidence: 80%

“…Figures 2 and 3(a) demonstrate that the phase and time position of the transmittance signals also show differences, indicating that the refractive index changes considerably (5~8%) with external electric field. Compared to our previous work 13 , the new structure, delivering a modulation depth of more than 17% for absorption loss, greatly enhanced the dielectric tunability of the KTO crystal. Figure 3(c) shows simulated electric field distribution of the LC resonator structure at resonance frequency using CST Microwave studio frequency-domain solver.…”

Section: Resultsmentioning

confidence: 80%

“…Figure 4(b) demonstrates modulation of the imaginary part of permittivity as a function of the applied electric power and its fit. In the frequency range of 0.1–0.7 THz, the active KTaO 3 hybrid metamaterial structure does not show a giant dielectric loss, the magnitude of ε” is about 3–15, nearly the same with that of KTO crystal without any structure 13 . We notice that the peak positon of ε” shifts obviously with different levels of voltage bias, indicative of the tuning of LC resonance frequency.…”

Section: Resultsmentioning

confidence: 90%

“…reported the broad-band dielectric properties and lattice dynamics of KTO ceramics, revealing that the soft mode frequency agrees well with the values that in single crystal 12 . We have investigated the dielectric property of KTO single crystals in the terahertz range, and found that the dielectric constant can be modulated by an optical field at room temperature, which decreased ~3.5% with light excitation power of 600 mW 13 .…”

Section: Introductionmentioning

confidence: 99%

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Active KTaO3 hybrid terahertz metamaterial

Liu

et al. 2017

Sci Rep

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The dielectric properties of an active KTaO3 hybrid metamaterial structure and its tunability under external electric fields are investigated at room temperature by means of terahertz time-domain spectroscopy. Application of the electric field leads to an appreciable tuning of the dielectric loss, which is up to 17%. Meanwhile, the refractive index also changes appreciably. These findings are attributed to the internal space charge field in the crystal caused by the excited free carriers.

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Active KTaO3 hybrid terahertz metamaterial

Liu

et al. 2017

Sci Rep

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“…When the temperature approaches the transition point, the resonances shift to lower frequencies (submillimeter and millimeter wavelength ranges). [179][180][181] [153][154][155][156][157][158][159][160][161][162] To obtain higher modulation efficiency with stronger nonlinearity, the resonant behavior can be used to enhance the interaction between materials and electromagnetic waves by narrowing the interaction bandwidth.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Jeong

Bahk

Kim

2019

Advanced Optical Materials

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Phase‐change phenomena have been an attractive research theme for decades due to the dynamic transition of material properties providing extraordinary capabilities for versatile optical device applications. Even at the terahertz (THz) frequency regime, phase‐change materials (PCMs) promote the development of dynamic devices, especially when combined with a plasmonic approach delivering strong field enhancement and localization. According to the design of plasmonic metamaterials or hybrid composites, PCMs can actively modulate the electromagnetic properties of THz waves through thermal, electrical, and optical means. In turn, THz waves can affect the PCM properties in the nonlinear regime due to the intense field strength enhancement by plasmonic structures. Here, a few types of PCMs demonstrating promising potential in THz plasmonic applications are introduced. Starting from the best‐known transition metal oxide, vanadium dioxide (VO2), which possesses an insulator‐to‐metal phase transition near room temperature, superconductors, chalcogenides, ferroelectrics, liquid crystals, and liquid metals are covered along with their phase‐change properties and the control mechanisms infused with THz plasmonic applications. The corresponding recent progress presenting how PCMs combined with plasmonic structures can demonstrate effective THz modulation is reviewed. This general overview may provide a better understanding of dynamic THz plasmonics and new ideas for future THz technology.

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KTaO₃—The New Kid on the Spintronics Block

Gupta¹,

Harsha²,

Kumari³

et al. 2022

Advanced Materials

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Long after the heady days of high‐temperature superconductivity, the oxides came back into the limelight in 2004 with the discovery of the 2D electron gas (2DEG) in SrTiO3 (STO) and several heterostructures based on it. Not only do these materials exhibit interesting physics, but they have also opened up new vistas in oxide electronics and spintronics. However, much of the attention has recently shifted to KTaO3 (KTO), a material with all the “good” properties of STO (simple cubic structure, high mobility, etc.) but with the additional advantage of a much larger spin‐orbit coupling. In this state‐of‐the‐art review of the fascinating world of KTO, it is attempted to cover the remarkable progress made, particularly in the last five years. Certain unsolved issues are also indicated, while suggesting future research directions as well as potential applications. The range of physical phenomena associated with the 2DEG trapped at the interfaces of KTO‐based heterostructures include spin polarization, superconductivity, quantum oscillations in the magnetoresistance, spin‐polarized electron transport, persistent photocurrent, Rashba effect, topological Hall effect, and inverse Edelstein Effect. It is aimed to discuss, on a single platform, the various fabrication techniques, the exciting physical properties and future application possibilities of this family of materials.

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Modulation of dielectric properties of KTaO_3 in terahertz region via 532nm continuous-wave laser

Cited by 10 publications

References 16 publications

Active KTaO3 hybrid terahertz metamaterial

Active KTaO3 hybrid terahertz metamaterial

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

KTaO₃—The New Kid on the Spintronics Block

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Modulation of dielectric properties of KTaO_3 in terahertz region via 532nm continuous-wave laser

Cited by 10 publications

References 16 publications

Active KTaO3 hybrid terahertz metamaterial

Active KTaO3 hybrid terahertz metamaterial

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

KTaO3—The New Kid on the Spintronics Block

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Product

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KTaO₃—The New Kid on the Spintronics Block