Graphene-integrated waveguides: Properties, preparation, and applications

Chang, Kaili; Li, Zenghui; Gu, Yuzong; Liu, Kaihui; Chen, Ke

doi:10.1007/s12274-022-4539-4

Cited by 7 publications

(1 citation statement)

References 222 publications

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“…Graphene, as a two-dimensional nanomaterial, has excellent optical and electrical properties such as high carrier mobility, low loss, and an ultrafast optical response time [30][31][32]. When a bias voltage is added to the surface of graphene, the Fermi level of graphene varies with the external voltage, which results in the continuous regulation of conductivity over a wide frequency range [33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Five-Band Tunable Terahertz Metamaterial Absorber Using Two Sets of Different-Sized Graphene-Based Copper-Coin-like Resonators

Wang,

Qin,

Zhao

et al. 2024

Photonics

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In this paper, a five-band metamaterial absorber with a tunable function in a terahertz band is proposed, which consists of a gold grounding layer, a polyimide dielectric layer, and a periodic patterned graphene layer. The patterned graphene layer is constructed from two sets of copper-coin-shaped structures of different sizes. The designed absorber achieves absorptions of 96.4%, 99.4%, 99.8%, 98.4%, and 99.9% at 4.62 THz, 7.29 THz, 7.70 THz, 8.19 THz, and 8.93 THz, respectively, with an average absorption intensity of 98.78%. The physical mechanism of this five-band absorber was explained by the impedance matching principle and electric field distribution. The absorption performance of the five-band absorber can be effectively tuned by changing the geometry of the patterned graphene array and the thickness of the dielectric layer. Given that the resonant frequency of the absorber varies in proportion to the Fermi level, by varying the Fermi level of the graphene hypersurface, we can achieve the continuous tuning of the absorption performance over a wide frequency range. The five-band absorber has a stable absorption performance over a wide incidence angle of 0–65°, and by combining the merits of high absorption, dynamic adjustability, and a large number of absorption peaks, the given absorber could have great potential for applications in nondestructive testing, imaging, communication, sensing, and detectors.

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Section: Introductionmentioning

confidence: 99%

Five-Band Tunable Terahertz Metamaterial Absorber Using Two Sets of Different-Sized Graphene-Based Copper-Coin-like Resonators

Wang,

Qin,

Zhao

et al. 2024

Photonics

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Waveguide‐Integrated Two‐Dimensional Material Photodetectors in Thin‐Film Lithium Niobate

Zhu

Zhang

Ren

et al. 2023

Advanced Photonics Research

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Thin‐film lithium niobate on insulator (LNOI) is a promising platform for optical communications, microwave photonics, and quantum technologies. While many high‐performance devices like electro‐optic modulators and frequency comb sources have been achieved on LNOI platform, it remains challenging to realize photodetectors (PDs) on LNOI platform using simple and low‐cost fabrication techniques. 2D materials are excellent candidates to achieve photodetection since they feature strong light‐matter interaction, excellent mechanical flexibility, and potential large‐scale complementary metal–oxide–semiconductor‐compatible fabrication. Herein, this demand is addressed using an LNOI‐2D material platform, and two types of high‐performance LNOI waveguide‐integrated 2D material PDs, namely graphene and tellurium (Te), are addressed. Specifically, the LNOI‐graphene PDs feature broadband operations at telecom and visible wavelengths, high normalized photocurrent‐to‐dark current ratios up to 3 × 106 W−1, and large 3‐dB photoelectric bandwidths of ≈40 GHz, simultaneously. The LNOI‐Te PDs on the other hand provide ultrahigh responsivities of 7 A W−1 under 0.5 V bias for telecom signals while supporting GHz frequency responses. The results show that the versatile properties of 2D materials and their excellent compatibility with LNOI waveguides could provide important low‐cost solutions for system operating point monitoring and high‐speed photoelectric conversion in future LNOI photonic integrated circuits.

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Two-dimensional optoelectronic devices for silicon photonic integration

Tang

Chen

et al. 2023

Journal of Materiomics

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Graphene-integrated waveguides: Properties, preparation, and applications

Cited by 7 publications

References 222 publications

Five-Band Tunable Terahertz Metamaterial Absorber Using Two Sets of Different-Sized Graphene-Based Copper-Coin-like Resonators

Five-Band Tunable Terahertz Metamaterial Absorber Using Two Sets of Different-Sized Graphene-Based Copper-Coin-like Resonators

Waveguide‐Integrated Two‐Dimensional Material Photodetectors in Thin‐Film Lithium Niobate

Two-dimensional optoelectronic devices for silicon photonic integration

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