Chiral plasmonics

Hentschel, Mario; Schäferling, Martin; Duan, Xiaoyang; Gießen, Harald; Liu, Na

doi:10.1126/sciadv.1602735

Cited by 691 publications

(596 citation statements)

References 112 publications

(165 reference statements)

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“…Chirality is a fundamental property describing structures that cannot be superimposed with their mirror images. While ubiquitous on the molecular scale, chirality has only recently been identified as an important tool to tailor the optical properties of plasmonic nanostructures …”

Section: Introductionmentioning

confidence: 99%

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Large‐Area 3D Plasmonic Crescents with Tunable Chirality

Goerlitzer

Mohammadi

Nechayev

et al. 2019

Advanced Optical Materials

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Chiral plasmonic nanostructures hold promise for enhanced chiral sensing and circular dichroism spectroscopy of chiral molecules. It is therefore of interest to fabricate chiral plasmonic nanostructures with tailored chiroptical properties over large areas with reasonable effort. Here, a colloidal lithography approach is used to produce macroscopic arrays of sub‐micrometer 3D chiral plasmonic crescent structures over areas >1 cm2. The chirality originates from symmetry breaking by the introduction of a step within the crescent structure. This step is produced by an intermediate layer of silicon dioxide onto which the metal crescent structure is deposited. It is experimentally demonstrated that the chiroptical properties in such structures can be tailored by changing the position of the step within the crescent. These experiments are complemented by finite element simulations and the application of a multipole expansion to elucidate the physical origin of the circular dichroism of the crescent structures.

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Section: Introductionmentioning

confidence: 99%

“…Motivated by these applications, a range of complex nanostructures with extraordinary chiral properties has recently emerged . Such structures include stacked split‐ring resonators, nanohelices, plasmonic dimers/oligomers, DNA‐based materials, structures fabricated by on‐edge lithography, and planar symmetric heterotrimers …”

Section: Introductionmentioning

confidence: 99%

Large‐Area 3D Plasmonic Crescents with Tunable Chirality

Goerlitzer

Mohammadi

Nechayev

et al. 2019

Advanced Optical Materials

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“…However, circular dichroism (CD), a chiral response manifested as the differential absorption between left circularly polarized (LCP) and right circularly polarized (RCP) light, has been found prominent in the helix‐type 3D metamaterials ( Figure a) but relatively weak in the monolayer 2D metasurfaces (Figure b). The fundamental reason is that intrinsic optical chirality, in principle, requires a structure without mirror symmetry referring to any plane, which necessitates 3D chiral geometries and is inapplicable for traditional 2D metasurfaces with a uniform flat‐profile in the vertical dimension. Consequently, enhanced chiroptical responses rely on symmetry breaking by using multiple materials, multilayer stackings or spatial modal interferences, which result in increased complexity in both design and fabrication procedures.…”

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confidence: 99%

Fano‐Enhanced Circular Dichroism in Deformable Stereo Metasurfaces

Liu

et al. 2020

Advanced Materials

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2D metasurfaces have emerged as a paradigm‐shifting platform for light management with considerable miniaturization and alleviated fabrication challenges than their 3D counterparts. However, the appearance of in‐plane mirror symmetry and reduced dimensions impose fundamental restraints to advanced chiroptical responses and reconfiguration capabilities. Here, a new concept of Fano‐enhanced circular dichroism by introducing a reconfigurable stereo metasurface, which possesses deformable out‐of‐plane twists that are readily achieved by a simple nano‐kirigami fabrication method, is demonstrated. The stereo height and twisting geometries can be reproducibly controlled, providing a facile and automated fashion to tailor the distinct profiles of Fano resonances under circularly polarized incidence. As a result, a recorded high efficiency of circular dichroism generation per unit sample thickness is achieved with Fano resonances in opposite lineshapes. Leveraging this feature, large‐range reconfiguration of circular dichroism at optical wavelengths is demonstrated through reversible compression of the stereo metasurfaces with a fiber tip. The studied stereo metasurface unfolds a new degree of freedom for advanced photonic applications in a quasi‐flat optical platform, and the proposed concept of Fano‐enhanced circular dichroism opens new venues to explore interesting fundamental phenomena of chiral optics.

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“…Chiral plasmonic nanostructures and chiral metasurfaces, especially 3D ones possess unique chiroptical properties . They are very useful for applications in chiral optics, chiral sensing, and optical manipulation of chiral objects . So far, fabrication of 3D plasmonic nanostructures and metasurfaces is still challenging and complex, setting up a major technical barrier to the applications.…”

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confidence: 99%

Stress‐Induced 3D Chiral Fractal Metasurface for Enhanced and Stabilized Broadband Near‐Field Optical Chirality

Tseng

Lin

Kuo

et al. 2019

Advanced Optical Materials

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Metasurfaces comprising 3D chiral structures have shown great potential in chiroptical applications such as chiral optical components and sensing. So far, the main challenges lie in the nanofabrication and the limited operational bandwidth. Homogeneous and localized broadband near‐field optical chirality enhancement has not been achieved. Here, an effective nanofabrication method to create a 3D chiral metasurface with far‐ and near‐field broadband chiroptical properties is demonstrated. A focused ion beam is used to cut and stretch nanowires into 3D Archimedean spirals from stacked films. The 3D Archimedean spiral is a self‐similar chiral fractal structure sensitive to the chirality of light. The spiral exhibits far‐ and near‐field broadband chiroptical responses from 2 to 8 µm. With circularly polarized light (CPL), the spiral shows superior far‐field transmission dissymmetry and handedness‐dependent near‐field localization. With linearly polarized excitation, homogeneous and highly enhanced broadband near‐field optical chirality is generated at a stably localized position inside the spiral. The effective yet straightforward fabrication strategy allows easy fabrication of 3D chiral structures with superior broadband far‐field chiroptical response as well as strongly enhanced and stably localized broadband near‐field optical chirality. The reported method and chiral metasurface may find applications in broadband chiral optics and chiral sensing.

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Chiral plasmonics

Abstract: We present a comprehensive overview of chirality and its optical manifestation in plasmonic nanosystems and nanostructures.

Cited by 691 publications

References 112 publications

Large‐Area 3D Plasmonic Crescents with Tunable Chirality

Large‐Area 3D Plasmonic Crescents with Tunable Chirality

Fano‐Enhanced Circular Dichroism in Deformable Stereo Metasurfaces

Stress‐Induced 3D Chiral Fractal Metasurface for Enhanced and Stabilized Broadband Near‐Field Optical Chirality

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