Modeling Terahertz Properties of Vanadium Dioxide by 
<i>Ab Initio</i>
 Computational Scheme and its Experimental Verification

Ban, Zhen Guo; Shi, Yan; Huang, Ning Qian; Li, Long; Lu, Xue; Zhu, Hong Fu; Shi, Qi Wu; Huang, Wanxia; Cui, Tie Jun

doi:10.1103/physrevapplied.18.064095

Cited by 7 publications

(2 citation statements)

References 68 publications

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“…18 The complex interplay between Coulomb interaction and structural effects in VO 2 films induces a percolation phenomenon-a mixture of metallic and insulating phases near the IMT. 3,[19][20][21][22][23][24][25][26][27] Previous studies, such as those by Cocker et al, 28,29 have reported a gradual transformation from insulating to metallic conductivity of nanogranular VO 2 films and analyzed the influence of percolation through complex THz conductivity spectra. More recently, H.T.…”

Section: Separation Of Terahertz and DC Conductivity Transitions In E...mentioning

confidence: 99%

Separation of terahertz and DC conductivity transitions in epitaxial vanadium dioxide films

Lu,

Gao,

Liu

et al. 2024

Journal of Applied Physics

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Terahertz (THz) light, probing electronic responses near the Fermi level, is closely linked to DC transport. In this study, we investigate the in situ THz and DC conductivity of epitaxial VO2 films near the heating-induced insulator–metal transition. We find that the THz conductivity transition occurs at lower temperatures than the DC conductivity transition, with the separation increasing with film thickness and crystallization quality. Analysis of the complex conductivity spectra attributes this separation to released carrier confinement at THz frequencies. Our findings contribute to a deeper understanding of electron dynamics in VO2 films.

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Section: Separation Of Terahertz and DC Conductivity Transitions In E...mentioning

confidence: 99%

Separation of terahertz and DC conductivity transitions in epitaxial vanadium dioxide films

Lu,

Gao,

Liu

et al. 2024

Journal of Applied Physics

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“…has provided an unprecedented degree of freedom to dynamically control the electromagnetic wave [17]. By employing tunable components or materials, such as PIN diode [2], varactor [18], vanadium oxide (VO 2 ) [19], and gallium arsenide (GaAs) [20], etc., the resulting programmable metasurface can control the electromagnetic responses in real time. With the logically arranging the spatial coding sequences or performing time coding sequences, metasurface based functional devices demonstrate various promising applications in scattering wave control.…”

Section: Introductionmentioning

confidence: 99%

A spatiotemporal encoding metasurface design for manipulation of integrated radiation-scattering characteristic

Hou,

Shi

2024

J. Phys. D: Appl. Phys.

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This paper presents a spatiotemporal encoding metasurface design to independently achieve the good radiation and the low scattering performances in the same frequency band. The proposed metasurface unit cell is composed of a square patch and two orthogonally placed I-shaped strips. By switching the operating states of the PIN diode inserted into each I-shaped strip between ON state and OFF state, a phase difference of 180° can be obtained in the band of 7.6–7.95 GHz for two orthogonally polarized incident waves. When a coaxial probe is introduced at the diagonal line of the square patch, the dual-polarized radiation capability is achieved within the frequency range of 7.6–7.95 GHz. With the proposed metasurface unit cell, the manipulation of the radiating wave and the scattering wave has no influence on each other. By controlling the PIN operating states by the field programmable gate array in real time, the power of the scattering wave is transferred to some higher order harmonics, thus realizing radar cross section (RCS) reduction. With optimized spatial and temporal encoding layouts, the proposed metasurface realizes the RCS reduction over 10 dB within the range of 7.3–8 GHz, with the maximum RCS reduction of 35.6 dB, while maintaining good radiation capability.

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Role of 4f electrons and 3d-4f hybridization in metal-insulator transition in RE (La, Nd, Sm, Eu, Dy and Er)-doped vanadium dioxide for thermochromic applications

Azmat,

Yang,

et al. 2024

Ceramics International

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Modeling Terahertz Properties of Vanadium Dioxide by Ab Initio Computational Scheme and its Experimental Verification

Cited by 7 publications

References 68 publications

Separation of terahertz and DC conductivity transitions in epitaxial vanadium dioxide films

Separation of terahertz and DC conductivity transitions in epitaxial vanadium dioxide films

A spatiotemporal encoding metasurface design for manipulation of integrated radiation-scattering characteristic

Role of 4f electrons and 3d-4f hybridization in metal-insulator transition in RE (La, Nd, Sm, Eu, Dy and Er)-doped vanadium dioxide for thermochromic applications

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