Vanadium dioxide based broadband THz metamaterial absorbers with high tunability: simulation study

Wang, Shengxiang; Cai, Chengfeng; You, Menghan; Liu, Fangyan; Wu, Menghao; Li, Songzhan; Bao, Huaguang; Kang, Lei; Werner, Douglas H.

doi:10.1364/oe.27.019436

Cited by 73 publications

(28 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The values of the (complex) relative permittivity of VO at any value of the free-space wavelength are significantly different in its two crystallographic phases. As VO is a dissipative insulator (or semiconductor) (I phase) when monoclinic but metallic (M phase) when tetragonal provided that the free-space wavelength nm, it can be used in reconfigurable metasurfaces in the infrared 12 , 13 and terahertz 14 , 15 spectral regimes. The capability in switching of functionality in structures comprising tunable materials is often considered from the multifunctionality perspective 16 – 18 .…”

Section: Introductionmentioning

confidence: 99%

Transmissive terahertz metasurfaces with vanadium dioxide split-rings and grids for switchable asymmetric polarization manipulation

Serebryannikov

Lakhtakia

Vandenbosch

et al. 2022

Sci Rep

View full text Add to dashboard Cite

Metasurfaces containing arrays of thermally tunable metal-free (double-)split-ring meta-atoms and metal-free grids made of vanadium dioxide (VO$$_2$$ 2 ), a phase-change material can deliver switching between (1) polarization manipulation in transmission mode as well as related asymmetric transmission and (2) other functionalities in the terahertz regime, especially when operation in the transmission mode is needed to be conserved for both phases of VO$$_2$$ 2 . As the meta-atom arrays function as arrays of metallic subwavelength resonators for the metallic phase of VO$$_2$$ 2 , but as transmissive phase screens for the insulator phase of VO$$_2$$ 2 , numerical simulations of double- and triple-array metasurfaces strongly indicate extreme scenarios of functionality switching also when the resulting structure comprises only VO$$_2$$ 2 meta-atoms and VO$$_2$$ 2 grids. More switching scenarios are achievable when only one meta-atom array or one grid is made of VO$$_2$$ 2 components. They are enabled by the efficient coupling of the geometrically identical resonator arrays/grids that are made of the materials that strongly differ in terms of conductivity, i.e. Cu and VO$$_2$$ 2 in the metallic phase.

show abstract

Section: Introductionmentioning

confidence: 99%

Transmissive terahertz metasurfaces with vanadium dioxide split-rings and grids for switchable asymmetric polarization manipulation

Serebryannikov

Lakhtakia

Vandenbosch

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…[6] These two factors prevent the simultaneous achievement of orthogonal-polarization modulation and high efficiency, especially in terahertz or higher frequency regions. Although multilayer vanadium-dioxide metasurfaces have been seen as promising for use in efficient multifunctional devices, such as reconfigurable absorbers, [36][37][38][39][40][41][42][43][44][45][46][47][48] reprogrammable wavefront-engineering metasurfaces, [49,50] and devices switchable between quarterand half-wave plates, [51] these proposals have not been realized experimentally, because of the stringent fabrication challenges. Although a few studies have reported experimental realization of multilayer vanadium-dioxide structures for infrared polarization modulation [52] and terahertz asymmetric transmission, [53] they did not focus on orthogonal-polarization modulation.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Quarter‐Wave Metasurface for Efficient Helicity Inversion of Polarization Beyond the Single‐Layer Conversion Limit

Kobachi

Miyamaru

Nakanishi

et al. 2021

Advanced Optical Materials

View full text Add to dashboard Cite

Terahertz chiral sensing and polarization‐multiplexing communication demand subwavelength devices that dynamically invert polarization helicity. Metasurfaces can enhance anisotropy and fine tunability at subwavelength scales for this purpose. Although metasurfaces enabling deep modulation between orthogonal polarizations have been designed, they suffer from low conversion efficiencies. In this study, it is shown that the efficiency of conversion from linear to circular polarization by conventional single‐layer transmissive metasurfaces cannot exceed a fundamental limit. A dynamic reflective metasurface free from this limitation is then proposed. The device includes multilayer structures working as a terahertz quarter‐wave plate with switchable slow and fast axes. A phase transition of vanadium dioxide induces the necessary structural transformation of the metallic patterns. A practical fabrication method, based on the room‐temperature bonding technique of sapphires, is presented. Dynamic helicity inversion is demonstrated at 0.90 THz, with a conversion efficiency of over 80% that is beyond the fundamental limit of single‐layer transmissive metasurfaces (65%) and more than four times greater than that of previously reported devices.

show abstract

“…To solve this challenge, MM structures integrated with active media (i.e., active THz devices), such as MEMS [25,26], graphene [27][28][29], vanadium dioxide (VO 2 ) [30,31], indium antimonide (InSb) [32,33] and semiconductors silicon (Si) [34,35], etc., have been presented and designed to realize the dynamic and active manipulation of THz wave under the control of external stimuli, such as electrical biasing, optical illumination and thermal excitation. Among these tunable materials, the photoconductive semiconductors (Si) [36,37] can provide a viable pathway to realize a fast change of the reflection/transmission responses for the incident waves under the excitation of light pulse with its exceptional opticalelectrical characteristics, including ultrafast response, low cost and high quantum efficiency.…”

Section: Introductionmentioning

confidence: 99%

Photo-Excited Switchable Terahertz Metamaterial Polarization Converter/Absorber

Dong

You-de

et al. 2021

Crystals

View full text Add to dashboard Cite

In this paper, a photo-excited switchable terahertz metamaterial (MM) polarization converter/absorber has been presented. The switchable structure comprises an orthogonal double split-ring resonator (ODSRR) and a metallic ground, separated by a dielectric spacer. The gaps of ODSRR are filled with semiconductor photoconductive silicon (Si), whose conductivity can be dynamically tuned by the incident pump beam with different power. From the simulated results, it can be observed that the proposed structure implements a wide polarization-conversion band in 2.01–2.56 THz with the conversion ratio of more than 90% and no pump beam power incident illuminating the structure, whereas two absorption peaks operate at 1.98 THz and 3.24 THz with the absorption rates of 70.5% and 94.2%, respectively, in the case of the maximum pump power. Equivalent circuit models are constructed for absorption states to provide physical insight into their operation. Meanwhile, the surface current distributions are also illustrated to explain the working principle. The simulated results show that this design has the advantage of the switchable performance afforded by semiconductor photoconductive Si, creating a path towards THz imaging, active switcher, etc.

show abstract

Vanadium dioxide based broadband THz metamaterial absorbers with high tunability: simulation study

Cited by 73 publications

References 67 publications

Transmissive terahertz metasurfaces with vanadium dioxide split-rings and grids for switchable asymmetric polarization manipulation

Transmissive terahertz metasurfaces with vanadium dioxide split-rings and grids for switchable asymmetric polarization manipulation

Dynamic Quarter‐Wave Metasurface for Efficient Helicity Inversion of Polarization Beyond the Single‐Layer Conversion Limit

Photo-Excited Switchable Terahertz Metamaterial Polarization Converter/Absorber

Contact Info

Product

Resources

About