Reconfigurable Plasmonic Chirality: Fundamentals and Applications

Neubrech, Frank; Hentschel, Mario; Liu, Na

doi:10.1002/adma.201905640

Cited by 73 publications

(73 citation statements)

References 54 publications

(124 reference statements)

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“…Another unparalleled advantage of DNA origami for chiral assembly of metallic NPs is the reconfigurable capability under external physical or chemical stimuli., [183][184][185] which makes dynamic modulation of chiroptical activity possible by imparting reconfigurability and functionality to originally passive plasmonic systems. As shown in Figure 8e, a 3D plasmonic cross-like nanostructure consisting of two Au NRs can be created by hosting the NRs on a switchable DNA origami template made of two connected bundles.…”

Section: Chirality Transfer Via Dna-guided Self-assemblymentioning

confidence: 99%

Chirality Transfer from Sub‐Nanometer Biochemical Molecules to Sub‐Micrometer Plasmonic Metastructures: Physiochemical Mechanisms, Biosensing, and Bioimaging Opportunities

et al. 2020

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Section: Chirality Transfer Via Dna-guided Self-assemblymentioning

confidence: 99%

Chirality Transfer from Sub‐Nanometer Biochemical Molecules to Sub‐Micrometer Plasmonic Metastructures: Physiochemical Mechanisms, Biosensing, and Bioimaging Opportunities

et al. 2020

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“…Importantly, it was found that optical helicity density fundamentally determines the circular dichroism (CD) in local interactions of light with chiral molecules or nanostructures 45 , which is critical for the characterization of chiral molecules in important biochemistry and pharmaceutical industries 46 , 47 . Therefore, the realization of on-chip and active modulation on optical helicity density and the associated CD is of great significance 48 , 49 . To this aim, an array of three-arm pinwheels are designed and the induced helicity enhancement factor is evaluated by , where η and η 0 are the calculated optical helicity density with and without the nanostructure, respectively, under left-/right-handed circularly polarized (LCP/RCP) incidence (see “Methods” for details) 45 .…”

Section: Resultsmentioning

confidence: 99%

Electromechanically reconfigurable optical nano-kirigami

Chen

Liu

et al. 2021

Nat Commun

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Kirigami, with facile and automated fashion of three-dimensional (3D) transformations, offers an unconventional approach for realizing cutting-edge optical nano-electromechanical systems. Here, we demonstrate an on-chip and electromechanically reconfigurable nano-kirigami with optical functionalities. The nano-electromechanical system is built on an Au/SiO2/Si substrate and operated via attractive electrostatic forces between the top gold nanostructure and bottom silicon substrate. Large-range nano-kirigami like 3D deformations are clearly observed and reversibly engineered, with scalable pitch size down to 0.975 μm. Broadband nonresonant and narrowband resonant optical reconfigurations are achieved at visible and near-infrared wavelengths, respectively, with a high modulation contrast up to 494%. On-chip modulation of optical helicity is further demonstrated in submicron nano-kirigami at near-infrared wavelengths. Such small-size and high-contrast reconfigurable optical nano-kirigami provides advanced methodologies and platforms for versatile on-chip manipulation of light at nanoscale.

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“…The DNA origami template can exhibit tunable relative rotation angles between two plasmonic achiral nanorods, allowing distinct optical chiral responses, as illustrated in Figure 3D. Beyond DNA technologies [71], many other techniques can be used to reconfigure the strong optical chirality of these meta-atoms, including hydrogenation/dehydrogenation [72,73], photoexcitation [74], and others [75][76][77].…”

Section: Full-wave Manipulation Via Stacked Meta-atomsmentioning

confidence: 99%

Tailoring Light with Layered and Moiré Metasurfaces

Wang

Mazor

et al. 2021

Trends in Chemistry

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Optical metasurfaces are assemblies of subwavelength, artificially designed inclusions forming planarized devices with unprecedented capabilities to manipulate electromagnetic waves and facilitate multiple functionalities. Recent topical efforts in this research area have been focused on pushing forward the frontiers of enhanced light-matter interactions exploiting new concepts and fabrication capabilities. In this context, layered and twisted metasurfaces have showcased interesting features, including flexibility and tunability in manipulating light, contributing to the development of moiré physics for light. Here, we provide an overview on the state-of-art layered and stacked moiré metasurfaces. Freespace multifunctional metadevices are first discussed, followed by recent discoveries in polaritonics and twistronics for twisted hyperbolic metasurface bilayers. We conclude with a discussion on recent advances in the nanofabrication of moiré metasurfaces and remark on their future potential applications. Emerging Strategies for Advanced Optical Metasurfaces Using Twisting and StackingOptical metasurfaces (see Glossary), commonly recognized as the 2D counterpart of bulk metamaterials, are composed of subwavelength planarized inclusions [1,2]. Unlike metamaterials, metasurfaces usually have a thickness smaller than the operational wavelength in free space, holding the promise for next-generation multifunctional, compact, and integrated functional optical devices. Their ultrathin nature can significantly ease nanofabrication requirements compared with metamaterials, making them compatible for mass production in the semiconductor industry. One essential step in designing metasurfaces is to control light interactions with its local functional composites, so-called meta-atoms, thus enabling unprecedented control of the local scattering processes in terms of phase, amplitude, polarization, frequency, dispersion, and more [3][4][5][6]. In this way, a designer metasurface can be endowed with unprecedented control in tailoring the impinging light. This process inherently requires resonant light-matter interactions in meta-atoms, given the small light-matter interaction length. Tremendous efforts have been made in searching for better materials and novel metasurface designs for improved performance. For composite materials, metals can support enhanced photonic local density of states due to plasmonic phenomena, but may suffer from large Ohmic loss [7][8][9]. On the contrary, all-dielectric materials have significantly lower loss, but typically require a larger thickness, in the order of the wavelength in the material, limiting the field localization and enhancement of light-matter interactions [10]. Various geometries have been explored to realize metasurfaces, including split ring resonators, nanorods, and V-shape nanoantennas, supporting optical resonances in subwavelength meta-atoms [7,10]. These designs typically rely on heavy optimization techniques to obtain the best responses, requiring computational resources and tim...

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Reconfigurable Plasmonic Chirality: Fundamentals and Applications

Cited by 73 publications

References 54 publications

Chirality Transfer from Sub‐Nanometer Biochemical Molecules to Sub‐Micrometer Plasmonic Metastructures: Physiochemical Mechanisms, Biosensing, and Bioimaging Opportunities

Chirality Transfer from Sub‐Nanometer Biochemical Molecules to Sub‐Micrometer Plasmonic Metastructures: Physiochemical Mechanisms, Biosensing, and Bioimaging Opportunities

Electromechanically reconfigurable optical nano-kirigami

Tailoring Light with Layered and Moiré Metasurfaces

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