Giant circular dichroism induced by tunable resonance in twisted Z-shaped nanostructure

Yu, Qingxu; Huang, Lishun; Wang, Li; Zhang, Zhongyue

doi:10.1364/oe.25.005480

Cited by 62 publications

(25 citation statements)

References 36 publications

(39 reference statements)

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“…The main limitation of a geometry-focused approach for chiral plasmonics is that the functionality cannot be easily manipulated post-fabrication. This drawback has motivated research work to fabricate plasmonic nanostructures whose chiroptical properties can be manipulated [55][56][57][58][59][60][61][62][63]. Figure 3 shows the calculated near-field chiral density (Ĉ) for a shuriken-shaped nanostructure [57].…”

Section: Plasmonics For Enhanced Chiroptical Effectsmentioning

confidence: 99%

Chiral Plasmonics and Their Potential for Point-of-Care Biosensing Applications

Paiva-Marques

Gómez

Oliveira

et al. 2020

Sensors

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There has been growing interest in using strong field enhancement and light localization in plasmonic nanostructures to control the polarization properties of light. Various experimental techniques are now used to fabricate twisted metallic nanoparticles and metasurfaces, where strongly enhanced chiral near-fields are used to intensify circular dichroism (CD) signals. In this review, state-of-the-art strategies to develop such chiral plasmonic nanoparticles and metasurfaces are summarized, with emphasis on the most recent trends for the design and development of functionalizable surfaces. The major objective is to perform enantiomer selection which is relevant in pharmaceutical applications and for biosensing. Enhanced sensing capabilities are key for the design and manufacture of lab-on-a-chip devices, commonly named point-of-care biosensing devices, which are promising for next-generation healthcare systems.

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Section: Plasmonics For Enhanced Chiroptical Effectsmentioning

confidence: 99%

Chiral Plasmonics and Their Potential for Point-of-Care Biosensing Applications

Paiva-Marques

Gómez

Oliveira

et al. 2020

Sensors

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“…For the case of molecules it is known, that light of opposite handedness compared to the molecule handedness may also lead to efficient excitation [2]. Indeed, such a spectral response was experimentally observed before for the case of chiral 'plasmonic molecules' of various geometries [15][16][17][18][19][20][21][22]. This zero crossing can be qualitatively described in terms of a coupled oscillating dipoles within the Born-Kuhn model [16,23].…”

Section: Introductionmentioning

confidence: 98%

Resonant behavior of a single plasmonic helix

Höflich¹,

Feichtner²,

Hansjürgen³

et al. 2019

Optica

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Chiral plasmonic nanostructures will be of increasing importance for future applications in the field of nano optics and metamaterials. Their sensitivity to incident circularly polarized light in combination with the ability of extreme electromagnetic field localization renders them ideal candidates for chiral sensing and for all-optical information processing. Here, the resonant modes of single plasmonic helices are investigated. We find that a single plasmonic helix can be efficiently excited with circularly polarized light of both equal and opposite handedness relative to that of the helix. An analytic model provides resonance conditions matching the results of full-field modeling. The underlying geometric considerations explain the mechanism of excitation and deliver quantitative design rules for plasmonic helices being resonant in a desired wavelength range. Based on the developed analytical design tool, single silver helices were fabricated and optically characterized. They show the expected strong chiroptical response to both handednesses in the targeted visible range. With a value of 0.45 the experimentally realized dissymmetry factor is the largest obtained for single plasmonic helices in the visible range up to now. arXiv:1811.04851v2 [physics.optics]

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“…It is clearly observed that a pronounced plasmonic resonance is present at λ = 760 nm under RCP incidence, whereas the transmission under LCP incidence is strongly suppressed, leading to a large differential transmittance. In order to distinguish it from circular dichroism (CD), a typical feature of a chiral response, which is defined as the difference in absorption of RCP and LCP [13][14][15], we named the differential transmittance as CD_T, which is shown in Figure 2B. The maximum value in Figure 2B means that the difference in electric intensities between RCP and LCP is the largest, which provides a basis for subsequent adjustment of potential and position for trapped neutral atoms.…”

Section: Designed Chiral Plasmonic Structurementioning

confidence: 99%

“…A wide variety of functional devices can be realized in such systems [3], including but not limited to sensors [4,5], polarizers [6][7][8], and photodetectors [9][10][11][12]. 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].…”

Section: Introductionmentioning

confidence: 99%

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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Giant circular dichroism induced by tunable resonance in twisted Z-shaped nanostructure

Cited by 62 publications

References 36 publications

Chiral Plasmonics and Their Potential for Point-of-Care Biosensing Applications

Chiral Plasmonics and Their Potential for Point-of-Care Biosensing Applications

Resonant behavior of a single plasmonic helix

Tunable atom-trapping based on a plasmonic chiral metamaterial

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