Journal ArticleDOI
Electrically controllable terahertz square-loop metamaterial based on VO₂ thin film.
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TLDR
An electrically controllable square-loop metamaterial based on vanadium dioxide (VO2) thin film was proposed in the terahertz frequency regime to perform roles not only as a resonator but also as a micro-heater for the electrical control of the VO2.Abstract:
An electrically controllable square-loop metamaterial based on vanadium dioxide (VO2) thin film was proposed in the terahertz frequency regime. The square-loop shaped metamaterial was adopted to perform roles not only as a resonator but also as a micro-heater for the electrical control of the VO2. A dual-resonant square-loop structure was designed to realize band-pass characteristics in the desired frequency band. The measured Q-factors of the basic and scaled-down metamaterials fabricated on VO2 thin films were 2.22 and 1.61 at the center frequencies of 0.44 and 1.14 THz in the passbands, respectively. The transmittances of the proposed metamaterial were successfully controlled by applying a bias voltage without an external heater. The measured transmittance on-off ratios of the metamaterials were over 40 at the center frequencies in the passbands. In the future, electrically controllable terahertz metamaterial based on VO2 metamaterial could be employed as high-performance active filters or sensors.read more
Citations
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Journal ArticleDOI
Broadband terahertz absorber with a flexible, reconfigurable performance based on hybrid-patterned vanadium dioxide metasurfaces.
TL;DR: An actively tunable broadband terahertz absorber is numerically demonstrated, which consists of four identical vanadium dioxide (VO2) square loops and a metal ground plane separated by a dielectric spacer that has the advantages of polarization insensitivity and wide-angle absorption.
Journal ArticleDOI
Metamaterials based on the phase transition of VO2
TL;DR: In this paper, a comprehensive review on recent research progress in the design and fabrication of active tunable metamaterials and devices based on phase transition of VO2 is presented.
Journal ArticleDOI
Active controllable dual broadband terahertz absorber based on hybrid metamaterials with vanadium dioxide
TL;DR: An active controllable terahertz absorber with dual broadband characteristics, comprised by two diagonal identical patterns of vanadium dioxide in the top layer of the classical three-layer structure of metamaterial perfect absorbers, that promises diverse applications in terAhertz regime, such as imaging, modulating, sensing and cloaking.
Journal ArticleDOI
Switchable multifunctional terahertz metasurfaces employing vanadium dioxide.
TL;DR: This paper designs a type of switchable metasurfaces by employing vanadium dioxide (VO2), which possess tunable and diversified functionalities in the terahertz (THz) frequencies and further extends the functionalities by introducing phase-gradients when VO2 is in its fully metallic state and consequently achieve polarization-insensitive beam-steering and polarization-splitting, while maintaining broadband absorption when VO1 is in insulating state.
Journal ArticleDOI
Ultrafast reprogrammable multifunctional vanadium-dioxide-assisted metasurface for dynamic THz wavefront engineering.
TL;DR: In this article, a new generation of ultrafast reprogrammable multi-mission bias encoded metasurface is proposed for dynamic terahertz wavefront engineering by employing VO2 reversible and fast monoclinic to tetragonal phase transition.
References
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Cutting-edge terahertz technology
TL;DR: An overview of the status of the terahertz technology, its uses and its future prospects are presented in this article, with a focus on the use of the waveband in a wide range of applications.
Journal ArticleDOI
Graphene plasmonics for tunable terahertz metamaterials
Long Ju,Baisong Geng,Baisong Geng,Jason Horng,Caglar Girit,Michael C. Martin,Zhao Hao,Hans A. Bechtel,Xiaogan Liang,Alex Zettl,Alex Zettl,Y. Ron Shen,Y. Ron Shen,Feng Wang,Feng Wang +14 more
TL;DR: It is demonstrated that graphene plasmon resonances can be tuned over a broad terahertz frequency range by changing micro-ribbon width and in situ electrostatic doping and the results represent a first look at light-plasmon coupling in graphene and point to potential graphene-based terAhertz metamaterials.
PatentDOI
Active terahertz metamaterial devices
TL;DR: An active metamaterial device capable of efficient real-time control and manipulation of terahertz radiation is demonstrated, which enables modulation of THz transmission by 50 per cent, an order of magnitude improvement over existing devices.
Journal ArticleDOI
Terahertz spectroscopy and imaging – Modern techniques and applications
TL;DR: The terahertz time-domain spectroscopy (THz-TDS) as discussed by the authors is a new spectroscopic technique based on coherent and time-resolved detection of the electric field of ultrashort radiation bursts.
Journal ArticleDOI
Terahertz-field-induced insulator-to-metal transition in vanadium dioxide metamaterial
Mengkun Liu,Harold Y. Hwang,Hu Tao,Andrew C. Strikwerda,Kebin Fan,George R. Keiser,Aaron Sternbach,Kevin G. West,Salinporn Kittiwatanakul,Jiwei Lu,Stuart A. Wolf,Fiorenzo G. Omenetto,Xin Zhang,Keith A. Nelson,Richard D. Averitt +14 more
TL;DR: The observation of an insulator–metal transition in vanadium dioxide induced by a terahertz electric field is reported, demonstrating that integration of metamaterials with complex matter is a viable pathway to realize functional nonlinear electromagnetic composites.