Second-Harmonic Generation from Sub-5 nm Gaps by Directed Self-Assembly of Nanoparticles onto Template-Stripped Gold Substrates

Dong, Zhaogang; Asbahi, Mohamed; Jun, Lin; Zhu, Dongmei; Wang, Ying Min; Hippalgaonkar, Kedar; Chu, Hong‒Son; Goh, Wei Peng; Wang, Fuke; Huang, Zhiwei; Yang, Joel K. W.

doi:10.1021/acs.nanolett.5b02109

Cited by 87 publications

(114 citation statements)

References 51 publications

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“…The designed metahologram is fabricated on a 370‐nm thick amorphous silicon film as deposited onto a 500‐μm thick glass substrate via electron‐beam lithography (ELS‐7000, Elionix) followed by dry etching of the silicon . The detailed processes and conditions are shown in Section of Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

Silicon multi‐meta‐holograms for the broadband visible light

Huang

Dong

Mei

et al. 2016

Laser & Photonics Reviews

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189

159

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The dielectric metasurface hologram promises higher efficiencies due to lower absorption than its plasmonic counterpart. However, it has only been used, up to now, for controlling linear-polarization photons to form single-plane holographic images in the near-infrared region. Here, we report a transmissiontype metahologram achieving images in three colors, free from high-order diffraction and twin-image issues, with 8-level modulation of geometric phase by controlling photon spin via precisely patterned Si nanostructures with varying orientations. The resulting real and virtual holographic images with spin dependence of incident photons natively enable the spin degeneracy removal of light, leading to a metahologram-enabled spin Hall effect of light. Low-absorption dielectrics also enable us to create holograms for short-wavelength light down to 480 nm, thus spanning the three primary colors. It possesses the potential for compact color-display chips using mature semiconductor processes, and holds significant advantages over previous metaholograms operating at longer wavelengths.

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Section: Methodsmentioning

confidence: 99%

Silicon multi‐meta‐holograms for the broadband visible light

Huang

Dong

Mei

et al. 2016

Laser & Photonics Reviews

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189

159

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“…Obviously, the lateral resolution of SHG is lower than the resolution offered by TEM and PFM. Yet, the quadratic relation between the SHG signal intensity and the electric field amplitude of the fundamental wave provides high sensitivity to small local field discontinuities or enhancements, even if these effects are limited to a region with a size well below the lateral resolution limit37. A further advantage is that the nonlinear optical susceptibility tensor describing the SHG process is directly related to the symmetry of the system and to its ferroic order3538.…”

mentioning

confidence: 99%

Non-Ising and chiral ferroelectric domain walls revealed by nonlinear optical microscopy

et al. 2017

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The properties of ferroelectric domain walls can significantly differ from those of their parent material. Elucidating their internal structure is essential for the design of advanced devices exploiting nanoscale ferroicity and such localized functional properties. Here, we probe the internal structure of 180° ferroelectric domain walls in lead zirconate titanate (PZT) thin films and lithium tantalate bulk crystals by means of second-harmonic generation microscopy. In both systems, we detect a pronounced second-harmonic signal at the walls. Local polarimetry analysis of this signal combined with numerical modelling reveals the existence of a planar polarization within the walls, with Néel and Bloch-like configurations in PZT and lithium tantalate, respectively. Moreover, we find domain wall chirality reversal at line defects crossing lithium tantalate crystals. Our results demonstrate a clear deviation from the ideal Ising configuration that is traditionally expected in uniaxial ferroelectrics, corroborating recent theoretical predictions of a more complex, often chiral structure.

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“…A significant ≈20 000‐fold PL enhancement in the WSe 2 flake can be achieved by integrating it with sub‐20 nm wide trenches in a gold substrate as presented in Figure 14b 149. The schematic diagram illustrates the CVD‐grown WSe 2 monolayer transferred onto gold trenches using the template‐stripping method 150. These trenches have advantages over other plasmonic nanostructures, such as ultra‐smooth surfaces, which will reduce the damping loss due to less plasmon scattering 151,152.…”

Section: Hybridization Of 2d‐tmds With Plasmonic Materials and Enhancmentioning

confidence: 99%

Hybridizing Plasmonic Materials with 2D‐Transition Metal Dichalcogenides toward Functional Applications

Sriram

Manikandan

Chuang

et al. 2020

Small

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10. 1002/smll.201904271. Recently, 2D transition metal dichalcogenides (TMDs) have become intriguing materials in the versatile field of photonics and optoelectronics because of their strong light-matter interaction that stems from the atomic layer thickness, broadband optical response, controllable optoelectronic properties, and high nonlinearity, as well as compatibility. Nevertheless, the low optical cross-section of 2D-TMDs inhibits the light-matter interaction, resulting in lower quantum yield. Therefore, hybridizing the 2D-TMDs with plasmonic nanomaterials has become one of the promising strategies to boost the optical absorption of thin 2D-TMDs. The appeal of plasmonics is based on their capability to localize and enhance the electromagnetic field and increase the optical path length of light by scattering and injecting hot electrons to TMDs. In this regard, recent achievements with respect to hybridization of the plasmonic effect in 2D-TMDs systems and its augmented optical and optoelectronic properties are reviewed. The phenomenon of plasmon-enhanced interaction in 2D-TMDs is briefly described and state-of-the-art hybrid device applications are comprehensively discussed. Finally, an outlook on future applications of these hybrid devices is provided. www.advancedsciencenews.com . His research directions include 1) direct growth, fundamental characterizations, and optoelectronic applications of 2D materials, including graphene and transition metal dichalcogenide. 2) Energy harvesting by Cu(In,Ga)Se 2 solar cells and phase-changed molten salts. 3) Low power-resistive random access memory.Small 2020, 16, 1904271 Scheme 1. Schematic diagram representing the hybridization of 2D-TMDs with plasmonic structures and various applications. (a) Reproduced with permission. [79]

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Second-Harmonic Generation from Sub-5 nm Gaps by Directed Self-Assembly of Nanoparticles onto Template-Stripped Gold Substrates

Cited by 87 publications

References 51 publications

Silicon multi‐meta‐holograms for the broadband visible light

Silicon multi‐meta‐holograms for the broadband visible light

Non-Ising and chiral ferroelectric domain walls revealed by nonlinear optical microscopy

Hybridizing Plasmonic Materials with 2D‐Transition Metal Dichalcogenides toward Functional Applications

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