Tunable and reflective polarization converter based on single-layer vanadium dioxide-integrated metasurface in terahertz region

Yu, Fuyuan; Zhu, Jia-bing; Shen, Xiaobo

doi:10.1016/j.optmat.2021.111745

Cited by 29 publications

(5 citation statements)

References 37 publications

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“…超表面通常功能单一，不能满足当前技术发展日益增长的要求。利用可调材料石墨烯 [1][2][3] 、Dirac 半金属 [4][5][6] 、光敏硅 [7][8][9] 和二氧化钒 [10][11][12][13] 组成复合超表面器件引起广泛关注，可以实现功能动态调控的器件。其中，相变材料二氧化钒可以通过热、电或光激励实现从绝缘态到金属态转变，而且该材料相变可逆。2021 年 Liu 等人 [14] 设计了石墨烯与二氧化钒复合超表面结构，实现双宽带可切换太赫兹吸收器，吸收率大于 90%。 2022 年 Jiang 等人 [15] 构建了二氧化钒超表面实现反射和透射交叉极化转换功能。Niu 等人 [16] 提出了二氧化钒双功能超表面，改变二氧化钒的电导特性实现了吸收和极化转换。Peng 等人 [17] 设计了二氧化钒超表面来实现宽带吸收和偏振转换之间的转换。2023 年，Lian 等人 [18] 提出了一种基于二氧化钒的多功能太赫兹超表面结构，二氧化钒处于金属态时，该结构在 1.97~4.63THz 频率内实现太赫兹吸收；二氧化钒处于绝缘态时，该结构可以作为一个宽带线极化转换器。本文提出了一种二氧化钒和金属复合的超表面结构实现宽带吸收和极化转换功能。当二氧化钒处于金属态时，该结构在6.32~18.06THz频率范围内实现吸收率大于90%的宽带吸收，带宽达到11.74THz，相对吸收带宽为96.3%。当二氧化钒处于绝缘态时，设计的超表面在2.41~3.42THz、 4.78~7.48THz和9.53~9.73THz…”

Section: 超表面可以在波长量级尺寸实现对电磁波灵活调控。然而，当前文献报道的unclassified

Switchable ultra-broadband absorption and polarization conversion terahertz metasurface

Wang,

Li,

Guo

2024

Acta Phys. Sin.

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Metasurfaces can achieve flexible modulation of electromagnetic waves at the dimension of wavelength level. However, the functions of the reported metasurfaces are usually fixed and cannot be changed, once their structural design is completed. The designed metasurface cannot meet the requirements for flexible regulation of terahertz waves. We found that the phase change materials of vanadium dioxide can achieve a transition from insulating state to metallic state through thermal, electrical, or light excitation, and the phase transition of this material is reversible. Therefore, using vanadium dioxide to form a composite metasurface can achieve dynamic modulation of terahertz waves. In this article, we propose a terahertz metasurface with switchable broadband absorption and polarization conversion. The proposed metasurface is composed of a 9-layer structure stacked from bottom to top with a combination pattern of different dielectric layers. By adjusting the conductivity of vanadium dioxide, the designed metasurface can achieve flexible switching between terahertz wave absorption and polarization conversion functions. When the vanadium dioxide is in the metal state, the designed metasurface behaves as a broadband absorber with an absorption rate of more than 90% in the range of 6.32 THz ~ 18.06 THz and a relative bandwidth of 96.3%. When the vanadium dioxide is in the insulated state, the designed structure exhibits as a polarization converter in the frequency ranges of 2.41 THz ~ 3.42 THz, 4.78THz ~ 7.48 THz, and 9.53 THz ~ 9.73 THz, with a polarization conversion rate of over 90%. We believe that this metasurface structure will have good applications in the field of terahertz wave detection, terahertz switches, terahertz filtering, terahertz communication, and terahertz sensing.

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Section: 超表面可以在波长量级尺寸实现对电磁波灵活调控。然而，当前文献报道的unclassified

Switchable ultra-broadband absorption and polarization conversion terahertz metasurface

Wang,

Li,

Guo

2024

Acta Phys. Sin.

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“…Since then, MPA has developed rapidly with continuous research efforts [20][21][22][23][24], from single-frequency to multi-frequency, polarization-sensitive to polarization-insensitive and narrowband to broadband MPA. Moreover, it has been developed to the full spectral range, such as microwave [25][26][27], terahertz [28][29][30][31], visible [32][33][34][35] and infrared [36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Polarization-insensitive metamaterial perfect absorber in near-infrared band based on trapezoidal silver array

Wang¹,

Feng²,

Zhang³

et al. 2023

Laser Phys.

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In this article, we presented our proposal for a metamaterial perfect absorber (MPA) operating in the near-infrared band. Our MPA comprised a trapezoidal silver layer, a substrate layer, and an intermediate alumina layer. The transmission characteristics of MPA were analyzed by the three-dimensional (3D) finite difference time domain method. The simulation results were analyzed by equivalent circuit theory. The results show that the MPA achieved 100% absorption of transverse magnetic (TM) polarization and transverse electric (TE) polarization with resonance wavelength λ = 1492.5 nm. By varying the length of the bottom side of the trapezoid, the MPA’s resonance wavelength could be effectively tuned, and the absorption was maintained at above 99%. With the incidence angle of 0°–55°, the absorption remains above 90% at TE polarization and above 80% at 55°–70°. The absorption at the TM polarization remains above 99% when the incident angle is 0°–70°. A wide angle of incidence and good absorption were achieved. The sensitivity (S) and figure of merit were 228 nm/refractive index unit and 1378 RIU−1, respectively. The proposed absorber with excellent absorption in the range of infrared spectra has a promising application potential in fields such as energy harvesting and infrared sensors.

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“…Electrical excitation indeed allows for more efficient and rapid modulation, but it also involves a more complex bias network, making it considerably more difficult to fabricate devices in the THz range [25]. In the same year, Yu et al proposed a single-layer VO 2 -based tunable reflective polarization converter metasurface, but with a relatively single function and not capable of switching between multiple functions [26]. In conclusion, VO 2 can be considered a promising material for achieving reconfigurable metamaterials in the THz band range.…”

Section: Introductionmentioning

confidence: 99%

Theoretical design of multilayered VO₂-based switchable terahertz metasurfaces as broadband functional devices

Liu¹,

Zhang²,

Duan³

2022

Phys. Scr.

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In this paper, a switchable terahertz metasurface based on VO2 multilayer structure is raised, which utilizes the temperature phase-transition properties of VO2 to achieve the functions of switchable polarization conversion and reflection phase modulation for arbitrarily polarized waves at different temperatures. The simulation results show that at high-temperature and low-temperature, the metasurface develop a resonant system to achieve polarization conversion for circularly polarized (CP) and linearly polarized (LP) waves, respectively. For the conversion of the CP wave at high-temperature, the polarization conversion rate exceeds 90% in the terahertz frequency range of 1.01~2.00 THz; at low-temperature, the polarization conversion of the LP wave reaches a near-perfect polarization conversion rate at frequencies f=0.65, 1.07, and 1.50 THz. Arbitrary phase regulation can be achieved by rotating the VO2 strips and altering the geometry of the C-shaped split resonator ring (CSRR) to form a periodic array with a constant gradient phase. In order to verify that the device has the function of wavefront phase modulation, we use the device to simulate the abnormal reflection based on the generalized Snell's law.Additionally, we generated a bifocal focused beam within a cross-channel in LP incidence mode using the propagation phase principle.

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Tunable and reflective polarization converter based on single-layer vanadium dioxide-integrated metasurface in terahertz region

Cited by 29 publications

References 37 publications

Switchable ultra-broadband absorption and polarization conversion terahertz metasurface

Switchable ultra-broadband absorption and polarization conversion terahertz metasurface

Polarization-insensitive metamaterial perfect absorber in near-infrared band based on trapezoidal silver array

Theoretical design of multilayered VO₂-based switchable terahertz metasurfaces as broadband functional devices

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Tunable and reflective polarization converter based on single-layer vanadium dioxide-integrated metasurface in terahertz region

Cited by 29 publications

References 37 publications

Switchable ultra-broadband absorption and polarization conversion terahertz metasurface

Switchable ultra-broadband absorption and polarization conversion terahertz metasurface

Polarization-insensitive metamaterial perfect absorber in near-infrared band based on trapezoidal silver array

Theoretical design of multilayered VO2-based switchable terahertz metasurfaces as broadband functional devices

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Theoretical design of multilayered VO₂-based switchable terahertz metasurfaces as broadband functional devices