Programmable Terahertz Metamaterials with Non‐Volatile Memory (Laser Photonics Rev. 16(4)/2022)

Chen, Benwen; Wu, Jingbo; Li, Weili; Zhang, Caihong; Fan, Kebin; Xue, Quan; Chi, Yaojia; Wen, Qiye; Jin, Biaobing; Chen, Jian; Wu, Peiheng

doi:10.1002/lpor.202270019

Cited by 9 publications

(10 citation statements)

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“…[13] In recent years, metasurfaces have evolved from static to dynamic forms, further realizing tunable and programmable EM wave controls, and direct information processing. [14][15][16][17][18][19][20][21][22][23][24][25][26][27] In addition, intelligent applications such as adaptive perception, autonomous decisionmaking, and programmable diffractive deep neural network have been realized by introducing sensing modules and intelligent algorithms into metasurfaces. [28][29][30][31] Due to these compelling features, metasurfaces have been widely introduced to explore the integrated control of radiated waves and reflected waves.…”

Section: Introductionmentioning

confidence: 99%

Integrated Control of Radiations and In‐Band Co‐Polarized Reflections by a Single Programmable Metasurface

Tian

et al. 2023

Adv Funct Materials

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Integrated control of radiated and reflected electromagnetic (EM) waves is of great importance in information science and engineering, which are mostly achieved by elaborately integrating metasurfaces and antennas. However, most of the radiation‐reflection‐integrated designs remain difficulties to modulate the radiated waves directly without cascading additional radio‐frequency (RF) modules. More importantly, the completely independent control of radiated waves and in‐band co‐polarized reflected waves has rarely been achieved. Herein, direct, dynamic and integrated control of radiated waves and in‐band co‐polarized reflected waves is realized merely by a single programmable metasurface. The radiation‐reflection‐integrated programmable metasurface (RRIPM) can dynamically choose to radiate EM waves only or reflect incident EM waves only, and even dynamically modulate the radiation phases and reflection phases, thus realizing arbitrary radiation functions and in‐band co‐polarized reflection functions without crosstalk. To illustrate the capabilities of RRIPM, an ultra‐compact and broadband RRIPM prototype is designed and fabricated, and this is used for the radiation and reflection of multiple beams with arbitrary energy distributions, low‐gain‐fluctuation reflection‐beam scanning, and low‐side‐lobe‐level broadside radiation.

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Section: Introductionmentioning

confidence: 99%

Integrated Control of Radiations and In‐Band Co‐Polarized Reflections by a Single Programmable Metasurface

Tian

et al. 2023

Adv Funct Materials

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“…However, on the condition of not modulating the pump lasers, they all lack flexible control over the properties of the generated THz waves, such as their amplitude, phase, wavefront and pump polarization dependence. As for THz manipulators, they have undergone a rapid development in recent years benefitting from the metasurface method, and they includes chiral devices, [ 13–15 ] deflectors, [ 16–18 ] special beam generators, [ 19,20 ] holograms, [ 21,22 ] and active spatial THz modulators, [ 23,24 ] etc. However, such linear devices can only manipulate existing THz waves and their use will also introduce additional insertion loss and bandwidth limitations.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Terahertz Generation: Chiral and Achiral Meta‐Atom Coupling

Wang

Zhang

et al. 2023

Adv Funct Materials

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Generation and manipulation of terahertz (THz) waves are of vital importance for advancing THz technology. Nonlinear metasurfaces allow effective integration of both processes into a single compact device. However, such existing THz devices commonly rely on utilizing a single meta‐atom, which has fixed THz generation properties and thus limits the range of achievable functionalities. Here, it is demonstrate how coupling between different meta‐atoms within the unit‐cell can be used as a degree of freedom for controlling nonlinear THz generation, where achiral coupling provides full control over the amplitude of the generated THz field, while chiral coupling makes the THz generation sensitive to the handedness of the pump polarization. In particular, chiral coupling allows the realization of multiplexed pump‐handedness‐selective nonlinear metasurfaces, which is illustrated experimentally by selectively generating THz beams with different orbital angular momentum with a single nonlinear metasurface. This approach provides opportunities for developing various integrated nonlinear THz devices.

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“…Fortunately, the metasurface emerges as a novel planar device with periodic arrangements of subwavelength meta‐atoms that can be exploited for various terahertz functionalities, including frequency filtering, [ 8 ] focusing, [ 9,10 ] phase control, [ 11,12 ] beam steering, [ 13,14 ] and polarization conversion. [ 15 ] Since the proposal of the pioneering work combining semiconductors with metal metasurfaces, [ 16 ] dynamic terahertz modulation using optical, [ 17,18 ] electrical,, [ 19 ] thermal, [ 20 ] magnetic, [ 21 ] and mechanical [ 22,23 ] methods have been vigorously developed. The dynamically tunable nature overcomes the drawbacks of passive metasurfaces in immutable size, greatly enriching the versatility of terahertz devices based on metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

Transient Loss‐Induced Non‐Hermitian Degeneracies for Ultrafast Terahertz Metadevices

He,

Hu,

Ren

et al. 2023

Advanced Science

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Non‐Hermitian degeneracies, also known as exceptional points (EPs), have attracted considerable attention due to their unique physical properties. In particular, metasurfaces related to EPs can open the way to unprecedented devices with functionalities such as unidirectional transmission and ultra‐sensitive sensing. Herein, an active non‐Hermitian metasurface with a loss‐induced parity‐time symmetry phase transition for ultrafast terahertz metadevices is demonstrated. Specifically, the eigenvalues of the non‐Hermitian transmission matrix undergo a phase transition under optical excitation and are degenerate at EPs in parameter space, which is accompanied by the collapse of chiral transmission. Ultrafast EP modulation on a picosecond time scale can be realized through variations in the transient loss at a non‐Hermitian metasurface pumped by pulsed excitation. Furthermore, by exploiting the physical characteristics of chiral transmission EPs, a switchable quarter‐wave plate based on the photoactive metasurface is designed and experimentally verified and realized the corresponding function of polarization manipulation. This work opens promising possibilities for designing functional terahertz metadevices and fuses EP physics with active metasurfaces.

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Programmable Terahertz Metamaterials with Non‐Volatile Memory (Laser Photonics Rev. 16(4)/2022)

Cited by 9 publications

References 0 publications

Integrated Control of Radiations and In‐Band Co‐Polarized Reflections by a Single Programmable Metasurface

Integrated Control of Radiations and In‐Band Co‐Polarized Reflections by a Single Programmable Metasurface

Nonlinear Terahertz Generation: Chiral and Achiral Meta‐Atom Coupling

Transient Loss‐Induced Non‐Hermitian Degeneracies for Ultrafast Terahertz Metadevices

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