Broadband and high-efficiency thermal switchable InSb metasurface for terahertz wave anomalous reflection and focusing effect

Ni, Cheng; Dong, Liang; Xu, Zhenbang; Wang, M.; Wu, Ling; Cheng, Yongzhi

doi:10.1016/j.mtcomm.2023.106305

Cited by 9 publications

(3 citation statements)

References 46 publications

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“…Consequently, achieving reprogrammable THz metamaterials that match the performance of existing microwave materials poses a significant challenge. Researchers to overcome this limitation have turned to active materials such as graphene 45 , 46 , vanadium dioxide ( ) 47 , 48 , InSb 49 , and liquid crystals 50 to manipulate THz EM waves. However, achieving control of reflected and transmitted waves in MSs is not limited to the microwave band, and efforts have also been made in the THz band.…”

Section: Introductionmentioning

confidence: 99%

Reprogrammable reflection-transmission integrated coding metasurface for real-time terahertz wavefront manipulations in full-space

Farzin,

Nooramin,

Soleimani

2024

Sci Rep

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In recent years, there has been notable advancement in programmable metasurfaces, primarily attributed to their cost-effectiveness and capacity to manipulate electromagnetic (EM) waves. Nevertheless, a significant limitation of numerous available metasurfaces is their capability to influence wavefronts only in reflection mode or transmission mode, thus catering to only half of the spatial coverage. To the best of our knowledge and for the first time, a novel graphene-assisted reprogrammable metasurface that offers the unprecedented capability to independently and concurrently manipulate EM waves within both half-spaces has been introduced in the THz frequency band. This intelligent programmable metasurface achieves wavefront control in reflection mode, transmission mode, and the concurrent reflection-transmission mode, all within the same polarization and frequency channel. The meta-atom is constructed with two graphene sections, enabling straightforward modification of wave behavior by adjusting the chemical potential distribution within each graphene segment via an external electronic source. The proposed functionalities encompass various programmable modes, including single and dual beam control in reflection mode, dual beam control in transmission mode, simultaneous control of dual beams in reflection mode-direct transmission, and vice versa, and control of beam steering in reflection mode-dual beams in transmission mode simultaneously. The proposed metasurface is expected to be reprogrammable due to wavefront manipulation in both half-spaces separately and continuously for various applications such as imaging systems, encryption, miniaturized systems, and next-generation wireless intelligent communications.

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Section: Introductionmentioning

confidence: 99%

Reprogrammable reflection-transmission integrated coding metasurface for real-time terahertz wavefront manipulations in full-space

Farzin,

Nooramin,

Soleimani

2024

Sci Rep

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“…Despite the fact that the terahertz band is still a topic of ongoing research, it is a challenging area because most natural materials generally exhibit weak electromagnetic responses within this frequency range. Terahertz devices made from these natural materials have drawbacks, such as large volume and low efficiency, which have led to slower progress in this field [11,12]. Nevertheless, the development of terahertz absorbers based on electromagnetic resonators, as pioneered by Landy et al in 2008 [13], has significantly accelerated research progress in this field.…”

Section: Introductionmentioning

confidence: 99%

Metamaterial terahertz device with temperature regulation function that can achieve perfect absorption and complete reflection conversion of ultrawideband

Sun,

Yi,

et al. 2024

Commun. Theor. Phys.

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Terahertz devices are an important field in terahertz technology. However, most devices currently have limited functionality and poor performance. In order to improve device performance and achieve multifunctionality, we have designed a terahertz device based on a combination of vanadium dioxide and metamaterials. By utilizing the phase transition characteristics of vanadium dioxide, the device has tunability. The device is made up of a triple-layer structure inclusive of VO2, SiO2, and Au. This device exhibits various advantageous features, including broadband band coverage, high absorption capability, dynamic tunability, a simple structural design, polarization insensitivity, and incident angle insensitivity. The simulation results show that by controlling the temperature, the terahertz device achieves a thermal modulation range of spectral absorptivity from 0 to 0.99. At a temperature of 313 K, the device exhibits complete reflection of terahertz waves. As the temperature increases, the absorption rate increases. When the temperature reaches 353 K, the device absorption rate reaches over 97.7% in the range of 5-8.55 THz. This study employs the effective medium theory to elucidate the correlation between conductivity and temperature during the phase transition of VO2. Simultaneously, the variation in device performance is further elucidated by analyzing and depicting the intensity distribution of the electric field on the device surface at different temperatures. Furthermore, the impact of various structural parameters on device performance is examined, offering valuable insights and suggestions for selecting suitable parameter values in real-world applications. These characteristic renders the device highly promising for applications in stealth technology, energy harvesting, modulation, and other related fields, thus showcasing significant potential.

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“…[28] Significant effort has been dedicated to designing nanophotonic metasurface platforms that enable dynamic control of their optical responses. [29][30][31][32][33][34][35][36][37][38][39] This endeavor arises from the challenge encountered by graded-pattern photonic metasurfaces due to their fixed structural parameters. To date, diverse physical phenomena, including thermo-optical, and quantum-confined Stark effects, mechanical reconfiguration, molecular phase transition, and free carrier modulation of integrated active materials, have been harnessed to facilitate tunability of the meta-atom.…”

Section: Introductionmentioning

confidence: 99%

Active Metasurfaces for Non‐Rigid Light Sail Interstellar Optical Communication

Taghavi,

Sabri,

Mosallaei

2023

Advcd Theory and Sims

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The non‐rigidity of the nanophotonic metasail platform and the intense imparted optical force from the terrestrial laser source lead to deformations during the propulsion stage. These deformations must be taken into consideration due to their potential adverse impact on communication performance. Alterations in the shape of the sail body result in varying angles of incidence and polarization components observed by the photonic unit cell, significantly impacting their intended performance. Based on this premise, this paper proposes utilizing a reflective all‐dielectric, low‐power active metasurface that dynamically compensates for the effects of deformation and facilitates beam‐steering for communication purposes among different light sails in interstellar space. Configured as p‐n multi‐junction layers, the constituent elements of the metasurface enable modulation of carrier concentrations through multigate biasing. Through electrostatic simulations, it demonstrates that the required permittivity modulation of can achieve a wide phase span of 320°. Furthermore, it has investigated the effect of the presence of non‐functional portions in the far‐field radiation pattern of the light sail and highlighted the critical role of tunable elements in mitigating its impact. The obtained results hold great promise for realizing successful interstellar downlink communication between such gram‐scale nano‐crafts and Earth.

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Broadband and high-efficiency thermal switchable InSb metasurface for terahertz wave anomalous reflection and focusing effect

Cited by 9 publications

References 46 publications

Reprogrammable reflection-transmission integrated coding metasurface for real-time terahertz wavefront manipulations in full-space

Reprogrammable reflection-transmission integrated coding metasurface for real-time terahertz wavefront manipulations in full-space

Metamaterial terahertz device with temperature regulation function that can achieve perfect absorption and complete reflection conversion of ultrawideband

Active Metasurfaces for Non‐Rigid Light Sail Interstellar Optical Communication

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