Graphene Plasmonics: A Platform for 2D Optics

Fan, Yuancheng; Shen, Nian‐Hai; Zhang, Fuli; Zhao, Qian; Wu, Hongjing; Fu, Quanhong; Wei, Zeyong; Li, Hongqiang; Soukoulis, Costas M.

doi:10.1002/adom.201800537

Cited by 169 publications

(90 citation statements)

References 173 publications

(184 reference statements)

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“…Graphene-based photodetectors can provide high response speed over broadband spectral ranges [5][6][7], while exhibiting a relatively low responsivity owing to the 2.3% optical absorption [8]. In order to improve the responsivity, researchers tend to develop hybrid graphene with quantum dots [9,10], plasmonic nanostructures [11,12], waveguide [3,13], or transition metal dichalcogenides (TMDCs) [14,15], which enhances the light-matter interaction.…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of tunneling photodetectors based on graphene/Al₂O₃/silicon heterostructures

Liu

et al. 2020

Nanophotonics

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Recent discoveries in the field of graphene-based heterostructures have led to the demonstration of high-performance photodetectors. However, the studies to date have been largely limited to the heterojunction with a Schottky barrier, restricted by an inevitable compromise between photoresponsivity and photodetectivity. Here, a new class of graphene-based tunneling photodetectors is introduced by inserting the Al 2 O 3 tunneling layer between silicon and graphene. The photocarriers can tunnel through the designed insulator layer which simultaneously blocks the dark current, thus maintaining high photodetectivity with desirable photoresponsivity. We further modulate the thickness of the Al 2 O 3 layer to explore the tunneling mechanism for the photocarriers, in which a photoresponsivity of 0.75 A/W, a high current ratio of 4.8 × 10 3 and a photodetectivity of 3.1 × 10 12 Jones are obtained at a 13.3-nmthick Al 2 O 3 layer. In addition, the fabrication process is compatible with conventional semiconductor processing, providing further flexibility to large-scale integrated photodetectors with high performance.

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Section: Introductionmentioning

confidence: 99%

Design and optimization of tunneling photodetectors based on graphene/Al₂O₃/silicon heterostructures

Liu

et al. 2020

Nanophotonics

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“…In addition, probing of photoinitiated ultrafast charge dynamics is possible thanks to the sub-picosecond time resolution. These properties predestinate the usage of graphene in fast field effect transistors, [9] plasmonic manipulations, [10] detectors of longwavelength radiation [11] or, e.g., graphene-based electrode applications. Herein is presented a review of the experiments performed on nanostructures of conventional semiconductors and on carbon nanomaterials (graphene and carbon nanotubes) during the past decade.…”

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confidence: 99%

Terahertz Spectroscopy of Nanomaterials: a Close Look at Charge‐Carrier Transport

Kužel

Němec

2019

Advanced Optical Materials

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Transport of charges is a fundamental process in many high-tech applications including photovoltaic or optoelectronic devices, but also in more ordinary components such as unsophisticated wires and other circuitry. The development of nanotechnologies resulted in the fabrication of highly complex materials consisting of a large variety of nanosized elements, which inevitably involve a multitude of charge transport processes occurring on various time-and length-scales. Figure 1 summarizes the most common nanoelements with high application potential.For example, the electrodes employed in Grätzel solar cells [1] are composed of percolated networks of a huge number of metal oxide nanoparticles (top-left panel in Figure 1). Colloidal nanocrystals form the basis for thin film electronics and flexible electronic devices. [2] The synthetic approaches control their composition, size and electronic structure (energy levels, density of states within the bands and in the bandgap) and the charge-carrier transport. [2,3] Nanowires and nanotubes made of conventional semiconductors are quasi 1D systems combining Terahertz spectroscopy has been used for almost two decades for investigations of nanomaterials, including nanocrystals, nanoparticles, nanowires, nanotubes or 2D crystals. Its great importance stems from the fact that it is a noncontact method and, owing to its high frequency and broadband character, it is capable of characterizing charge transport properties within individual nano-objects but also among them. In addition, probing of photoinitiated ultrafast charge dynamics is possible thanks to the sub-picosecond time resolution. Despite this unprecedented potential, the interpretation of the measured terahertz conductivity spectra in many materials is still intensively debated. Herein is presented a review of the experiments performed on nanostructures of conventional semiconductors and on carbon nanomaterials (graphene and carbon nanotubes) during the past decade. The state of the art of the theoretical formalism is provided and discussed, including the intrinsic response, as well as the role of inherent heterogeneity and of the experimental conditions.

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“…Own to the powerful wave manipulation abilities and planar characteristics, metasurface possesses special advantages compared with traditional optical devices, such as low profile, easy fabrication, and integration. In recent years, singular electromagnetic properties have been realized by metasurface, including anomalous reflection/refraction, flat lens, plasmonic lithography, high‐resolution imaging, vortex beam generation, and computer‐generated holograms . Among these, the metalenses are the indispensable elements in the design of the functional optical devices .…”

Section: Introductionmentioning

confidence: 99%

Realizing Broadband Transparency via Manipulating the Hybrid Coupling Modes in Metasurfaces for High‐Efficiency Metalens

Cheng

Wei

Fan

et al. 2019

Advanced Optical Materials

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Metasurfaces with locally controlled phase discontinuity are promising for novel manipulations of the optical fields. However, the high insert loss at off‐resonance frequencies and narrow operation band of the resonant metasurface lead to the common low efficiency, obstructing it from practical applications. Here, it is shown that a broadband transparent metasurface, made of three‐layer complementary square ring resonator (CSRR) arrays, can be employed for high‐efficiency and broadband beam manipulation. The nonuniform metasurface can be optimized with high transmittance (above 90%) while maintaining full range (from 0 to 2π) phase modulation by adjusting the geometric parameters of the CSRR on the middle layer. The physical insight can be understood with a coupled oscillator model, it is found that the interlayer coupling constant is the key factor to realize phase modulation with high efficiency. A transmittance metalens with long focal depth in broadband is experimentally demonstrated as an example, the measured transmission efficiency is higher than 80%. The developed broadband wavefront engineering elements can be employed for high‐performance, miniaturized and superior environmental suitability sensing, imaging, and communication system.

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Graphene Plasmonics: A Platform for 2D Optics

Cited by 169 publications

References 173 publications

Design and optimization of tunneling photodetectors based on graphene/Al₂O₃/silicon heterostructures

Design and optimization of tunneling photodetectors based on graphene/Al₂O₃/silicon heterostructures

Terahertz Spectroscopy of Nanomaterials: a Close Look at Charge‐Carrier Transport

Realizing Broadband Transparency via Manipulating the Hybrid Coupling Modes in Metasurfaces for High‐Efficiency Metalens

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Graphene Plasmonics: A Platform for 2D Optics

Cited by 169 publications

References 173 publications

Design and optimization of tunneling photodetectors based on graphene/Al2O3/silicon heterostructures

Design and optimization of tunneling photodetectors based on graphene/Al2O3/silicon heterostructures

Terahertz Spectroscopy of Nanomaterials: a Close Look at Charge‐Carrier Transport

Realizing Broadband Transparency via Manipulating the Hybrid Coupling Modes in Metasurfaces for High‐Efficiency Metalens

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Design and optimization of tunneling photodetectors based on graphene/Al₂O₃/silicon heterostructures

Design and optimization of tunneling photodetectors based on graphene/Al₂O₃/silicon heterostructures