Nanoporous Metallic Networks: Fabrication, Optical Properties, and Applications

Ron, Racheli; Haleva, Emir; Salomon, Adi

doi:10.1002/adma.201706755

Cited by 44 publications

(63 citation statements)

References 111 publications

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“…[50] This is because the hot-spots can be alternatively activated as function of the FW (and polarization). Additionally, since the average size of the building-blocks can be controlled by the physical parameters of the fabrication, [9,10] some tuning of the SHG responses for a specific wavelength might be attained as well.…”

Section: Broadband Shg Response and Spatial Localizationmentioning

confidence: 99%

Nanoporous Metallic Network as a Large-Scale 3D Source of Second Harmonic Light

et al. 2019

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Second harmonic generation (SHG) is forbidden from most bulk metals, because metals are characterized by a net zero electric-field in equilibrium. This limit breaks down when reaching nanoscale dimensions, as have been shown for metallic nano-particles and nano-cavities. Yet, nonlinear response from a three-dimensional (3D) macroscale metallic piece comprising suboptical wavelength features remains a challenge for many years. Herein, we introduce a largescale nanoporous metallic network whose building-blocks are assembled into an effective nonlinear conductive material, with a considerable conversion efficiency in a wide range of optical wavelengths. The high nonlinear response results from the network structure having a large surface area on which the inversion symmetry is broken. In addition, because of the 3D structure, hotspots can be formed also in deeper focal plans of the metallic network, and thus can give rise to coherent addition of the signal. The solid connectivity between the nanoscale building-blocks also plays a role, because it forms a robust network which may respond in a collective manner to form very intense hot-spots. Broadband responses of the metallic network are observed both by SHG and cathodoluminescence (CL). The large-scale dimension and generation of randomized hotspots make this 3D metallic network a promising candidate for applications like photocatalysis, sensing, or in optical imaging as structured illumination microscopy.

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Section: Broadband Shg Response and Spatial Localizationmentioning

confidence: 99%

Nanoporous Metallic Network as a Large-Scale 3D Source of Second Harmonic Light

et al. 2019

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“…In light of the vast unexplored potential of NMFs, in recent years, an increasing number of studies arose and multidisciplinary researchers, including chemists, physicists, biologists, and material scientists, became involved in this field (Figure 1b). Several excellent review articles containing certain introduction to NMFs have been published previously, [19,[26][27][28][29] and the development of NMFs and NMAs on certain aspects is presented in a few focused review articles. [21,30] However, a comprehensive overview of state-of-the-art progress of NMFs is missing, especially concerning the synthetic strategies and (electro)catalytic applications.…”

Section: Introductionmentioning

confidence: 99%

Engineering Self‐Supported Noble Metal Foams Toward Electrocatalysis and Beyond

Hübner

et al. 2019

Advanced Energy Materials

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Noble metals, despite their expensiveness, display irreplaceable roles in widespread fields. To acquire novel physicochemical properties and boost the performance‐to‐price ratio for practical applications, one core direction is to engineer noble metals into nanostructured porous networks. Noble metal foams (NMFs), featuring self‐supported, 3D interconnected networks structured from noble‐metal‐based building blocks, have drawn tremendous attention in the last two decades. Inheriting structural traits of foams and physicochemical properties of noble metals, NMFs showcase a variety of interesting properties and impressive prospect in diverse fields, including electrocatalysis, heterogeneous catalysis, surface‐enhanced Raman scattering, sensing and actuation, etc. A number of NMFs have been created and versatile synthetic approaches have been developed. However, because of the innate limitation of specific methods and the insufficient understanding of formation mechanisms, flexible manipulation of compositions, structures, and corresponding properties of NMFs are still challenging. Thus, the correlations between composition/structure and properties are seldom established, retarding material design/optimization for specific applications. This review is devoted to a comprehensive introduction of NMFs ranging from synthesis to applications, with an emphasis on electrocatalysis. Challenges and opportunities are also included to guide possible research directions in this field and promote the interest of interdisciplinary scientists.

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“…This platform can enable a new generation of low cost transparent media supporting ultradense optical circuitry for broadband light control.Metasurfaces are engineered structures for controlling light in different applications including wavefront shaping, [1][2][3][4][5] structural coloration, [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] hyperbolic structures, [22] bioimaging, [23] and lensing. [24][25][26][27][28] Metastructures are typically realized by engineering subwavelength patterns of different shapes in metal and/or dielectric heterostructures. The smaller the size of the pattern, the better the resolution and the controllability of the material response over a larger frequency bandwidth.…”

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confidence: 99%

Free‐Electron Transparent Metasurfaces with Controllable Losses for Broadband Light Manipulation with Nanometer Resolution

Bonifazi

Mazzone

et al. 2019

Advanced Optical Materials

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Controlling broadband light in nanoscale volumes is a desired goal in nanophotonics. Metastructures tackle this problem by subwavelength nanostructured patterns. The current technology reaches footprints of 50 nm with plasmonic nanostructures. Scaling down these values is challenging, especially in low loss dielectrics. Here, a new class of metasurfaces is introduced, “printed” point‐to‐point by free‐electron waves and created by altering the resonant atomic transition of inexpensive photosensitive materials. With this approach it is possible to directly write a desired distribution of refractive index and extinction coefficient with a resolution equal to the focusing accuracy of the electron beam, theoretically limited to the single nanometer. An application of this technology is illustrated in structural coloration. Currently, the best results are obtained with plasmonics at 127 000 dual polarization interferometry (DPI), with 50–200 nm structures and chromaticity ranging from blue to yellow. Free‐electron metasurfaces can generate the complete spectrum of colors of the cyan, yellow, magenta, and black system with resolutions up to 256 000 DPI, and nanostructures of 10 nm radius by using a single inexpensive layer of transparent material. This platform can enable a new generation of low cost transparent media supporting ultradense optical circuitry for broadband light control.

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Nanoporous Metallic Networks: Fabrication, Optical Properties, and Applications

Cited by 44 publications

References 111 publications

Nanoporous Metallic Network as a Large-Scale 3D Source of Second Harmonic Light

Nanoporous Metallic Network as a Large-Scale 3D Source of Second Harmonic Light

Engineering Self‐Supported Noble Metal Foams Toward Electrocatalysis and Beyond

Free‐Electron Transparent Metasurfaces with Controllable Losses for Broadband Light Manipulation with Nanometer Resolution

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