Asymmetric Transmission in the Planar Chiral Nanostructure Induced by Electric and Magnetic Resonance at the Same Wavelength

Bai, Yu; Wang, Tiankun; Ullah, Hamad; Yu, Qingxu; Abudukelimu, Abuduwaili; Zhang, Zhongyue

doi:10.1002/andp.201800469

Cited by 10 publications

(5 citation statements)

References 33 publications

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“…Rajaei et al experimentally reported giant circular dichroism (CD) with ramp-shaped plasmonic nanostructures [34]. In the above-mentioned works [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], we find that all designs are based on structure-surface-confined field effects to realize a variety of applications while ignoring spatial effects such as neutral atom trapping, an application that requires a noncontact field to be implemented.…”

Section: Introductionmentioning

confidence: 85%

“…Among them, there is a class of metamaterials with a special structure, named chiral metamaterials, which shows different electromagnetic response, also called chirality, to right-and left-handed circularly polarized (RCP and LCP) light [13][14][15]. This unique optical response renders chiral metamaterials highly promising candidates for a variety of applications [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. In general, chiral metamaterials are designed to be single-layered (planar chiral metamaterial) because of the relative ease of their fabrication [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Tunable atom-trapping based on a plasmonic chiral metamaterial

et al. 2019

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Chiral metamaterials provide a very convenient way to actively regulate the light field via external means, which is very important in nanophotonics. However, the very weak chiral response of a generally planar metamaterial severely limits its application. Therefore, it is important to design a system with large circular dichroism. Here we report an optical metamaterial with strong chirality in a bilayer gear-shaped plasmonic structure and consider this chiral response of such fields on tunable atom (87Rb) trapping. Simulation results show that maximum chiral response is observed when the two layers of the gear-shaped structures are rotated from each other by an angle of 60° at λ = 760 nm. Also, we demonstrate an active tunable potential for three-dimensional stable atom-trapping with tunable range of position and potential of a neutral atom of ~58 nm and ~1.3N mK (N denotes the input power with unit mW), respectively. In addition, the trap centers are about hundreds of nanometers away from the structure surface, which ensures the stability of the trapping system. The regulation of neutral atom trapping broadens the application of chiral metamaterials and has potential significance in the manipulation of cold atoms.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Tunable atom-trapping based on a plasmonic chiral metamaterial

et al. 2019

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“…Chirality refers to the fact that a structure cannot overlap with its mirror image; a structure and its mirror image are called enantiomers. , Chirality is ubiquitous in nature, particularly in proteins and DNA and is an integral part of life, attracting the attention of many researchers exploring methods for its detection and for the separation of enantiomers. Chiral materials exhibit novel electromagnetic phenomena, such as circular dichroism (CD), , negative refractive index, and asymmetric transmission effects. , CD is the differential transmission between left-circularly polarized (LCP, −) and right-circularly polarized (RCP, +) light in chiral nanostructures . The CD spectra are often used in characterizing the spatial structures of chiral materials and identifying the chiral characteristics of an unknown chiral material.…”

Section: Introductionmentioning

confidence: 99%

“…Chiral materials exhibit novel electromagnetic phenomena, such as circular dichroism (CD), 3,4 negative refractive index, 5 and asymmetric transmission effects. 6,7 CD is the differential transmission between left-circularly polarized (LCP, −) and right-circularly polarized (RCP, +) light in chiral nanostructures. 1 The CD spectra are often used in characterizing the spatial structures of chiral materials and identifying the chiral characteristics of an unknown chiral material.…”

Section: Introductionmentioning

confidence: 99%

Circular Dichroism Induced by the Coupling between Surface Plasmon Polaritons and Localized Surface Plasmon Resonances in a Double-Layer Complementary Nanostructure

et al. 2022

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Circular dichroism (CD) spectroscopy is an important technique for detecting and identifying chiral molecules in the fields of chemistry, biology, and other life sciences. Artificial plasmonic nanostructures exhibit considerable CD effects, but the preparation of 3D and multilayer chiral structures that exhibit large CD signals is usually difficult. Strong CD effects and simple fabrication processes are necessary. In this study, double-layer complementary nanostructures (DLCNs) that can generate prominent CD signals are prepared with a simple experimental method. Numerical calculations show that the physical mechanism underlying the CD effect is the coupling between localized surface plasmon resonances excited in complementary nanostructures and surface plasmon polaritons excited on a metal nanofilm under left-circularly polarized and right-circularly polarized light illuminations. The CD effect can be tuned by changing the parameter of the DLCN array. Results provide a way to generate CD effects with spatially complementary nanostructures and may provide an avenue for the chiral manipulation of light. These chiral nanostructures can be fabricated through simple methods, have considerable CD signals, and provide insights into the chiral optical response, providing novel tools for the design of chiral optoelectronic devices.

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“…[3,4] Thus, discriminating and detecting different chiral stereoisomers are necessary. Chiral substances usually exhibit special optical activities, such as asymmetric transmission, [5,6] circular dichroism (CD), [7,8] and circular polarization luminescence. [9,10] Optical activity can detect and characterize molecular chirality by the absorption difference of circularly polarized light by chiral stereoisomers.…”

Section: Introductionmentioning

confidence: 99%

Uniform Chiral Near‐Fields in Achiral Nanocavity Induced by Magnetic Polaritons Mode

et al. 2021

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Chiral near-fields are crucial in the analysis of chiral molecules, circularly polarized luminescence, and sensing. Under circularly polarized light illumination, left-and right-handed chiral near-fields occur around nanostructures. However, most previously reported works require structural chirality based on asymmetric 3D nanostructures. Usually, left-and right-handed chiral near-fields are difficult to separate in space, leading to low efficiency in applications. Here, achiral U-shaped groove nanostructure arrays are proposed to generate uniform chiral near-fields under circularly polarized light illumination. In contrast to vertical parallel plate nanostructures, a bottom layer is added below the two vertical parallel plates to design U-shaped groove nanostructures that induce magnetic polaritons mode. In the cavity of the achiral U-shaped groove nanostructure, chiral near-field is induced by the excitation of electric and magnetic near-fields with parallel components. These chiral near-fields strongly depend on the structural parameters of the U-shaped groove nanostructure. In addition, chiral molecules are introduced into the cavity of the U-shaped groove nanostructure to utilize it as sensors for chiral molecular detection. Numerical results show that the circular dichroism of the molecules is enhanced remarkably. These findings pave the way toward the development of practical and scalable platforms for new chiroptical applications.

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Asymmetric Transmission in the Planar Chiral Nanostructure Induced by Electric and Magnetic Resonance at the Same Wavelength

Cited by 10 publications

References 33 publications

Tunable atom-trapping based on a plasmonic chiral metamaterial

Tunable atom-trapping based on a plasmonic chiral metamaterial

Circular Dichroism Induced by the Coupling between Surface Plasmon Polaritons and Localized Surface Plasmon Resonances in a Double-Layer Complementary Nanostructure

Uniform Chiral Near‐Fields in Achiral Nanocavity Induced by Magnetic Polaritons Mode

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