Thermally tunable magnetic metamaterials at THz frequencies

Tung, Bui Son; Nguyễn, Vân Dung; Bùi, Xuân Khuyến; Nguyễn, Thanh Tùng; Lievens, Peter; Lee, YoungPak; Vu, Dinh Lam

doi:10.1088/2040-8978/15/7/075101

Cited by 27 publications

(10 citation statements)

References 30 publications

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“…Natural materials that fulfil this requirement include InSb, VO 2 and other vanadium oxides. Both InSb [33][34][35][36][37] and VO 2 [38] have been successfully used in tunable metamaterials and metasurfaces. Thermal tunability of electromagnetic surface-wave propagation has also been theoretically demonstrated [39,40].…”

Section: Introductionmentioning

confidence: 99%

“…Either the plane wave is transverse-magnetically (TM) polarized (i.e., the magnetic field is oriented normally to the cylinder axis) or it is transvserse-electrically (TE) polarized (i.e., the electric field is oriented normally to the cylinder axis). InSb shows a transition from the dielectric state to the plasmonic state in the THz spectral regime as the temperature is increased [33][34][35][36][37]39,40].…”

Section: Introductionmentioning

confidence: 99%

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Thermally sensitive scattering of terahertz waves by coated cylinders for tunable invisibility and masking

et al. 2018

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Temperature-sensitive scattering of terahertz (THz) waves by infinitely long, cylindrical core-shell structures was theoretically studied. Each structure is a dielectric cylinder coated with an InSb shell illuminated by either a transverse-electric (TE) or a transverse-magnetic (TM) plane wave. InSb is a thermally tunable semiconductor showing a transition from dielectric to plasmonic state at THz frequencies. Accordingly, the total scattering efficiency (TSE) can be thermally tuned for both polarization states of the incident plane wave. The spectral locations of the maxima and minima of the TSE of an InSb-coated cylinder can be exploited for cloaking the core. At least three scenarios lead to the strong suppression of scattering by a single core-shell structure in different spectral regimes when the temperature is fixed. The excitation of localized surface-plasmon resonances is the feature being common for two of them, while the effect of volumetric resonance dominates in the third scenario. Regimes that are either highly or weakly sensitive to the core material were identified. Weak sensitivity enables masking, i.e., the core material cannot be identified by a far-zone observer. The TSE minima are usually significantly sensitive to the polarization state, but ones with weak sensitivity to the polarization state also exist.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermally sensitive scattering of terahertz waves by coated cylinders for tunable invisibility and masking

et al. 2018

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“…The tunable MMs are obviously very highly desired and potential expectations for future optical devices are, for example, spatial light modulators and tunable optical filters. There are various strategies reported for tuning the magnetic resonance of the permeability include electrical control [16,17], magnetically control [18], and temperature changing [19,20]. Generally, tunability is introduced by ferromagnetic materials [21,22], ferroelectric [13,23], liquid crystal [20,24,25], etc.…”

Section: Introductionmentioning

confidence: 99%

Thermotunable Terahertz Negative-Index Metamaterials with Dielectric Spheres Embedded in Semiconductor Host

Chen

Qin

et al. 2018

Advances in Condensed Matter Physics

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A possibility to realize thermotunable isotropic negative-index metamaterials up to terahertz regime is theoretically investigated. The proposed composite metamaterials consist of dielectric spheres embedded randomly in a semiconductor host medium. As the variation in the intrinsic carrier density in InSb due to a variation in temperature thus changes the plasma frequency, we show theoretically the provided composite metamaterials whose index of refraction is thermally tunable and potentially less propagation loss. Furthermore, the effects of the radius of the dielectric sphere on the modulation frequency and bandwidth are discussed. Finally, we find that the design parameters for the composites can be scaled for application in the higher frequency regions.

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“…When heated above that point, crystal structure changes to rutile, accompanied with a dramatic increment of conductivity by several orders of magnitude, which signifies the occurrence of a metal-like state 4 – 7 . Such phase transition can be induced thermally 8 , electrically 9 and optically 10 . For this reason, the combination of VO 2 thin film or small particles with multifarious metamaterial structures, such as split-ring resonators 11 , are regarded as, and often proven to be, an efficient way towards dynamically controlling electromagnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Microwave Tunable Metamaterial Based on Semiconductor-to-Metal Phase Transition

Zhang

Lan

et al. 2017

Sci Rep

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A microwave tunable metamaterial utilizing the semiconductor-to-metal transition of vanadium dioxide (VO2) is proposed, experimentally demonstrated and theoretically scrutinized. Basic concept of the design involves the combination of temperature-dependent hysteresis in VO2 with resonance induced heating, resulting in a nonlinear response to power input. A lithographically prepared gold split-rings resonator (SRR) array deposited with VO2 thin film is fabricated. Transmission spectra analysis shows a clear manifestation of nonlinearity, involving power-dependence of resonant frequency as well as transmitted intensity at both elevated and room temperature. Simulation performed with CST Microwave Studio conforms with the findings. The concept may find applications in transmission modulation and frequency tuning devices working under microwave frequency bands.

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Thermally tunable magnetic metamaterials at THz frequencies

Cited by 27 publications

References 30 publications

Thermally sensitive scattering of terahertz waves by coated cylinders for tunable invisibility and masking

Thermally sensitive scattering of terahertz waves by coated cylinders for tunable invisibility and masking

Thermotunable Terahertz Negative-Index Metamaterials with Dielectric Spheres Embedded in Semiconductor Host

Microwave Tunable Metamaterial Based on Semiconductor-to-Metal Phase Transition

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