Enhanced Optical Modulation Depth of Terahertz Waves by Self‐Assembled Monolayer of Plasmonic Gold Nanoparticles

Wen, Tianlong; Zhang, Dainan; Wen, Qiye; Liao, Yulong; Zhang, Chong; Li, Jiayang; Tian, Wei; Li, Yuanpeng; Zhang, Huaiwu; Li, Yuanxun; Yang, Qinghui; Zhong, Zhiyong

doi:10.1002/adom.201600248

Cited by 53 publications

(28 citation statements)

References 47 publications

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“…They are the signature of the hexagonal network. The position of the (10) rod at 0.92 nm −1 leads to an inter-NP gap s = 1.93 ± 0.05 nm, in perfect agreement with other measurements from the literature [38][39][40]. s is slightly larger than the length of the straight dodecanethiol, 1.8 nm, showing that within the NP network the ligands could be not too distorted but at least they are strongly interdigitated.…”

Section: Chain Formationsupporting

confidence: 89%

Interactions Between Topological Defects and Nanoparticles

Missaoui

Coati

et al. 2020

Front. Phys.

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Liquid Crystal (LC) topological defects have been shown to trap nanoparticles (NPs) in the defect cores. The LC topological defects may thus be used as a matrix for new kinds of NP organizations templated by the defect geometry. We here study composites of LC smectic dislocations and gold NPs. Straight NP chains parallel to the dislocations are obtained leading to highly anisotropic optical absorption of the NPs controlled by light polarization. Combining Grazing Incidence Small Angle X-ray scattering (GISAXS), Rutherford Back Scattering (RBS), Spectrophotometry and the development of a model of interacting NPs, we explore the role of the Np size regarding the dislocation core size. We use NPs of diameter D = 6 nm embedded in an array of different kinds of dislocations. For dislocation core larger than the NP size, stable long chains are obtained but made of poorly interacting NPs. For dislocation core smaller than the NP size, the disorder is induced outside the dislocation cores and the NP chains are not equilibrium structures. However we show that at least half of these small dislocations can be filled, leading to chains with strongly enhanced electromagnetic coupling between the NPs. These chains are more probably stabilized by the elastic distortions around the defect cores, the distortion being enhanced by the presence of the grain boundary where the dislocations are embedded.

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Section: Chain Formationsupporting

confidence: 89%

Interactions Between Topological Defects and Nanoparticles

Missaoui

Coati

et al. 2020

Front. Phys.

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“…Motivated by the important role of THz modulators in enabling THz technology in future wireless systems, the performance of several amplitude and phase modulators was examined for various materials and fabrication processes [60]- [67]. For example, silicon (Si) substrates, coated with effective materials such as gold [60] and manganese iron oxide [61], as well as graphene-based modulators [68], [69] are proven to offer a performance enhancement to the THz modulators by extending the transmission range and pumping power density, in addition to their tunability and high-speed characteristics. Nevertheless, the main drawbacks of these nano-particle-based THz modulators are the high cost and the increased complexity.…”

Section: ) State-of-the-artmentioning

confidence: 99%

A Prospective Look: Key Enabling Technologies, Applications and Open Research Topics in 6G Networks

et al. 2020

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The fifth generation (5G) mobile networks are envisaged to enable a plethora of breakthrough advancements in wireless technologies, providing support of a diverse set of services over a single platform. While the deployment of 5G systems is scaling up globally, it is time to look ahead for beyond 5G systems. This is mainly driven by the emerging societal trends, calling for fully automated systems and intelligent services supported by extended reality and haptics communications. To accommodate the stringent requirements of their prospective applications, which are data-driven and defined by extremely lowlatency, ultra-reliable, fast and seamless wireless connectivity, research initiatives are currently focusing on a progressive roadmap towards the sixth generation (6G) networks, which are expected to bring transformative changes to this premise. In this article, we shed light on some of the major enabling technologies for 6G, which are expected to revolutionize the fundamental architectures of cellular networks and provide multiple homogeneous artificial intelligence-empowered services, including distributed communications, control, computing, sensing, and energy, from its core to its end nodes. In particular, the present paper aims to answer several 6G framework related questions: What are the driving forces for the development of 6G? How will the enabling technologies of 6G differ from those in 5G? What kind of applications and interactions will they support which would not be supported by 5G? We address these questions by presenting a comprehensive study of the 6G vision and outlining seven of its disruptive technologies, i.e., mmWave communications, terahertz communications, optical wireless communications, programmable metasurfaces, drone-based communications, backscatter communications and tactile internet, as well as their potential applications. Then, by leveraging the state-of-the-art literature surveyed for each technology, we discuss the associated requirements, key challenges, and open research problems. These discussions are thereafter used to open up the horizon for future research directions. INDEX TERMS 6G, backscatter communications, drone-based communications, terahertz communications, metasurfaces, mmWave, optical wireless communications, tactile internet.

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“…Thus, many novel materials and broadband modulation mechanisms have been introduced to solve this problem, especially optically modulated two-dimension (2D) materials ( e.g . graphene and MoS2) 16 – 21 , VO2 22 , 23 , doped organic film 24 – 30 , and nanoparticles 31 , 32 . For example, Weis et al .…”

Section: Introductionmentioning

confidence: 99%

Terahertz wave modulation enhanced by laser processed PVA film on Si substrate

Liu

Fan

et al. 2018

Sci Rep

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An optically pumped ultrasensitive broadband terahertz (THz) wave modulator based on polyvinyl alcohol (PVA) film on Si wafer was demonstrated in this work. The THz time domain spectroscopy experiments confirm that the PVA/Si can drastically enhance the photo-induced THz wave modulation on the Si surface, especially when the PVA film is heated by a high-power laser. A modulation depth of 72% can be achieved only under 0.55 W/cm2 modulated laser power, which is superior significantly to the bare Si. The numerical simulations indicate that the laser processed PVA (LP-PVA) film increases the photo-generated carrier concentration on the Si surface in two orders of magnitude higher than that of bare Si. Moreover, the modulation mechanism and the dynamic process of laser heating on the PVA/Si have been discussed. This highly efficient THz modulation mechanism and its simple fabrication method have great application potentials in THz modulators.

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Enhanced Optical Modulation Depth of Terahertz Waves by Self‐Assembled Monolayer of Plasmonic Gold Nanoparticles

Cited by 53 publications

References 47 publications

Interactions Between Topological Defects and Nanoparticles

Interactions Between Topological Defects and Nanoparticles

A Prospective Look: Key Enabling Technologies, Applications and Open Research Topics in 6G Networks

Terahertz wave modulation enhanced by laser processed PVA film on Si substrate

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