Design of an all-optical multi-logic operation-integrated metamaterial-based terahertz logic gate

Wang, Ziqun; Zhang, Zijing; Qiu, Fu; Wang, Meng; Yang, Weiguo; Li, Zhenhua; Hu, Xiaofei; Li, Yuanping; Yan, Xin; Yao, Haiyun; Liu, Liang

doi:10.1364/oe.473601

Cited by 8 publications

(2 citation statements)

References 34 publications

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“…A reconfigurable MEMS Fano resonant metasurface has been demonstrated that performs terahertz logic gate operations with electrical inputs exhibiting XOR and XNOR operations at far field, and NAND operation in the near-field 31 . Further, NOR and OR Boolean operations have been demonstrated in an all-optical terahertz logic gate made from a semiconductor-metal hybrid metasurface 32 . THz logic gates have also been demonstrated in metasurfaces based on spoof plasmons, in electro-thermally tunable metasurfaces, and in graphene-based metasurfaces 33 – 36 .…”

Section: Introductionmentioning

confidence: 99%

Terahertz binary computing in a coupled toroidal metasurface

Bhattacharya,

Chouhan,

Sharma

et al. 2024

Sci Rep

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The applications of terahertz metamaterials are being actively explored in recent times for applications in high-speed communication devices, miniature photonic circuits, and bio-chemical devices because of their wide advantages. The toroidal resonance, a new type of metasurface resonance, has been examined with great interest to utilize its properties in terahertz metasurface applications. This study reports a proof of concept design of a toroidal metasurface that experimentally demonstrates binary computing operations in the terahertz frequency regime. The analog computing of binary operations is achieved by the passive tuning of distance between the split ring resonators comprising the meta-molecule. The amplitude modulation is utilized as a method of determining the Boolean logic outputs of the system. The proposed metasurface could be further optimized for high amplitude modulations and active logic gate operations using tunable materials including graphene and ITO. The proposed metasurface consists of three split-ring resonators, and the near-field coupling between the adjacent resonators dictates the Boolean operations. A multipole analysis of the scattered powers of terahertz radiation determines the toroidal excitation in the metasurface. The proposed metasurfaces experimentally define AND Boolean logic operation at 0.89 terahertz, and OR Boolean logic operation at 0.97 terahertz. Numerical simulations support the experimentally obtained results. Additionally, we numerically report the excitation of NAND operation at 0.87 THz. Such toroidal analog computing metasurfaces could find applications in digitized terahertz circuits and integrated photonic devices.

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Section: Introductionmentioning

confidence: 99%

Terahertz binary computing in a coupled toroidal metasurface

Bhattacharya,

Chouhan,

Sharma

et al. 2024

Sci Rep

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“…Optical logic gates, the fundamental element of optical computing, have attracted much attention due to their ultrahigh process speed, high information capacity, and low power consumption [ 1 , 2 , 3 ]. Metamaterials and their two-dimensional (2D) equivalents metasurfaces, are the artificial metal or dielectric structures that can manipulate the amplitude, phase, and polarization of electromagnetic waves in the subwavelength scale [ 4 , 5 , 6 , 7 ], which have been applied in a wide range of fields, including negative refraction [ 8 ], beam steering [ 9 ], holography [ 10 ], perfect absorption effect [ 5 ], sensing [ 6 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band All-Optical Logic Gates by Coherent Absorption in an Amorphous Silicon Graphene Metasurface

Chen,

Shen,

et al. 2024

Nanomaterials

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The dual-band polarization-independent all-optical logic gate by coherent absorption effect in an amorphous silicon (a-Si) graphene metasurface is investigated theoretically and numerically. Taking the substrate effect into consideration, the coherent perfect absorption condition of the a-Si graphene metasurface is derived on the basis of the Cartesian multipole method. The coherent nearly perfect absorption of the a-Si graphene metasurface is realized by the interference of multipole moments and the interband transition of monolayer graphene, achieving peak values of 91% and 92% at 894.5 nm and 991.5 nm, respectively. The polarization independence of the coherent absorption is revealed due to the center symmetry of the structure of the a-Si graphene metasurface. The dual-band polarization-independent all-optical XOR and OR logic gates are implemented at 894.5 nm and 991.5 nm by the a-Si graphene metasurface based on the coherent nearly perfect absorption, which has the opportunity to be utilized in all-optical computing, all-optical data processing, and future all-optical networks.

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