Optical Properties of Chiral Three-Dimensional Plasmonic Oligomers at the Onset of Charge-Transfer Plasmons

Hentschel, Mario; Wu, Lin; Schäferling, Martin; Bai, Peng; Li, Er Ping; Gießen, Harald

doi:10.1021/nn304283y

Cited by 107 publications

(86 citation statements)

References 76 publications

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“…The particular interest of the kissing regime has been previously identified in the chiral response of threedimensional plasmonic oligomers. 34 The large spectral splitting and presence of higher order modes was found to facilitate a broadband circular dichroism of such structures. Similarly, we find in Figure 2 that the most broadband polarization conversion is obtained for the structures with the largest splitting, corresponding to the regime of touching nanorods.…”

Section: Resultsmentioning

confidence: 99%

Optimal Polarization Conversion in Coupled Dimer Plasmonic Nanoantennas for Metasurfaces

et al. 2014

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We demonstrate that polarization conversion in coupled dimer antennas, used in phase discontinuity metasurfaces, can be tuned by careful design. By controlling the gap width, a strong variation of the coupling strength and polarization conversion is found between capacitively and conductively coupled antennas. A theoretical two-oscillator model is proposed which shows a universal scaling of the degree of polarization conversion with the energy splitting of the symmetric and anti-symmetric modes supported by the antennas.Using single antenna spectroscopy, we find good agreement for the scaling of mode splitting and polarization conversion with gap width over the range from capacitive to conductive

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Section: Resultsmentioning

confidence: 99%

Optimal Polarization Conversion in Coupled Dimer Plasmonic Nanoantennas for Metasurfaces

et al. 2014

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“…Although planar meta/nanomaterials are thus 3D, it is clear that their threedimensionality is not very pronounced. At optical frequencies, various 3D structured meta/nanomaterials have been proposed, such as rosettes, [24,25] twisted arcs, [26] 3D shuriken, [27] stacked split rings, [28,29] oligomers, [30,31] gyroids, [32] and helices. [33][34][35][36] Of all these examples, the latter (i.e., the helix) is the archetypical chiral structure.…”

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confidence: 99%

Strong Rotational Anisotropies Affect Nonlinear Chiral Metamaterials

et al. 2017

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complications as the technique can become too sensitive, making it difficult to separate the desirable and undesirable contributions to the SHG signal. An example of an undesirable complication is extrinsic chirality, [15,16] which affects the nonlinear susceptibility tensor components in SHG. [17,18] Any anisotropy present in the sample can have a similar effect and our work here focuses on highlighting the effects of rotational anisotropy. We begin by selecting the sample geometry.Chirality is intrinsically a 3D property; however, a great number of works have focused on so-called "planar" nanostructures. A few recent examples include S-shaped nanostructures, [19,20] three-and fourfold symmetric propellers, [21] and heptamers. [22] These planar chiral nanostructures are very attractive because of their ease of fabrication with electron beam lithography. The necessary 3D symmetry-breaking arises from a dissymmetry along the axis perpendicular to the sample plane, [23] for instance, due to the presence of a substrate on one side of the sample and air on the other. Although planar meta/nanomaterials are thus 3D, it is clear that their threedimensionality is not very pronounced. At optical frequencies, various 3D structured meta/nanomaterials have been proposed, such as rosettes, [24,25] twisted arcs, [26] 3D shuriken, [27] stacked split rings, [28,29] oligomers, [30,31] gyroids, [32] and helices. [33][34][35][36] Of all these examples, the latter (i.e., the helix) is the archetypical chiral structure. The strong interaction of nanohelices with circularly polarized light (CPL) gives rise to large chiroptical effects, such as circular dichroism. This makes them attractive for applications involving CPL. [6,8,[37][38][39] Thus, the nonlinear optical response of helical metamaterials is of particular interest as they already demonstrate strong linear chiroptical effects. However, until recently it has been very difficult to fabricate high quality helical metamaterials for use at optical frequencies. Herein, we have investigated a chiral metamaterial made of nanohelices, with substantially subwavelength dimensions (<λ/10). As the archetypical chiral geometry, the helical design is particularly suitable because it is pronouncedly 3D, it gives rise directly to superchiral field configurations along the center of the helix, and its structural chirality parameter is straightforward to estimate as a function of varying dimensions. [33,40] Within this metamaterial, we clearly identify three different rotational anisotropies and demonstrate how they can mask the true chiral effect, rendering the SHG-CD signals unreliable. Our experimental results highlight the need for a general method to extract the true chiral contributions to the SHG signal. Here, we use a method for approximating these contributions. Although not fully rigorous, this method yields three measures of the chirality: averaged SHG-CD, direct inspection of the chiral component of the effective susceptibility tensor, and evaluation of the chiral coefficients tha...

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“…It has to be taken into account that, due to the spatial arrangement of the oligomer structures, the systems exhibit not only MO and chirooptical and properties, but also in-plane optical anisotropy. 6 …”

Section: Resultsmentioning

confidence: 99%

“…In natural elements, the intensity of such chiro-optical effect is usually small, but lately a new family of chiral media based on metal-dielectric nanostructures, which exhibits enhancement of the chiro-optical activity, has been proposed. 1,2,3,4,5,6,7 These structures have found applications in different areas, such as, negative refractive index materials, 8 asymmetric transmission, 9 or broadband circular polarizers 10,11 . Recently, it has been put forward that ultrasensitive detection of chiral molecules can be achieved using artificial chiral metallic nanostructures.…”

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confidence: 99%

Interaction Effects between Magnetic and Chiral Building Blocks: A New Route for Tunable Magneto-chiral Plasmonic Structures

et al. 2015

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We propose a novel active magneto-chiral system consisting of a separated Au/Co multilayer with perpendicular magnetic anisotropy and plasmonic chiral oligomers. The electromagnetic interaction between the Au/Co multilayer and chiral building blocks, which is governed by their separation distance, plays a relevant role in the control of both magneto-optical and chiral activity, resulting in a strong effect on the chiro-optical response. Due to the interaction-induced detuning of the disk resonances in the oligomers, the chiro-optical activity decreases with increasing interaction strength. The possibility to tune both magneto- and chiro-optical properties of the system by controlling the interaction strength opens the door for the fabrication of magneto-chiral systems in a wide spectral range, which is determined by both constituting magnetic and chiral components, as well as their electromagnetic interaction.

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Optical Properties of Chiral Three-Dimensional Plasmonic Oligomers at the Onset of Charge-Transfer Plasmons

Cited by 107 publications

References 76 publications

Optimal Polarization Conversion in Coupled Dimer Plasmonic Nanoantennas for Metasurfaces

Optimal Polarization Conversion in Coupled Dimer Plasmonic Nanoantennas for Metasurfaces

Strong Rotational Anisotropies Affect Nonlinear Chiral Metamaterials

Interaction Effects between Magnetic and Chiral Building Blocks: A New Route for Tunable Magneto-chiral Plasmonic Structures

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