Plasmonic chirality of L-shaped nanostructure composed of two slices with different thickness

Wang, Yongkai; Deng, Junchen; Wang, Gang; Fu, Tao; Yu, Qingxu; Zhang, Zhongyue

doi:10.1364/oe.24.002307

Cited by 53 publications

(34 citation statements)

References 37 publications

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“…It should be noticed that the peak CD pursued in our structure is far larger than that reported in ref. which, to our knowledge, is the only report of chiral metasurface based on L‐shaped monomers. This supports the idea that the interplay between plasmon resonances of the L‐shaped particles and the delocalized resonances of the underlying dielectric guiding layer is favoring the efficient chiral response of the structure, in agreement to the mechanism suggested in refs.…”

mentioning

confidence: 86%

Metasurface Reconfiguration through Lithium‐Ion Intercalation in a Transition Metal Oxide

Zanotto

Blancato

Buchheit

et al. 2016

Advanced Optical Materials

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1 of 6) 1600732 technology of mechanically reconfigurable metasurfaces is generating significant outcomes, [6] there are many applications which would benefit from a tunable device without any moving part. Being permeability in ordinary materials essentially equal to that in vacuum, researchers have intensively looked for processes enabling to tune the permittivity of some of the components which constitute the metasurface. A number of mechanisms and materials have been explored, spanning from free charge in ordinary semiconductors [7,8] and in graphene [9] up to phase-change materials, [10] materials based on insulatorto-metal or phase transitions, [11,12] gas adsorption into metals, [13] and liquid crystals. [14] An intrinsically different mechanism for tuning the permittivity of a material is electrochromism. In essence, electrochromism consists of a modification of the optical properties of the material occurring when it undergoes an electrochemical reaction. While being well known since many decades, its application to photonic devices is not yet fully explored. Most of the research developed to date is indeed based on conducting polymers; [15][16][17][18][19][20] however, electrochromism occurs also in transition metal oxides, which, compared to polymers, are in general more stable with respect to optical excitation.Among transition metal oxides, vanadium pentoxide (V 2 O 5 ) has the remarkable property to withstand the intercalation of huge amounts of lithium ions in its lattice [21][22][23] undergoing an intense investigation from the rechargeable battery community. Concurrently with lithium intercalation, the nearinfrared optical properties of V 2 O 5 are strongly modified, thus enabling the development of compact reconfigurable photo nic devices operating at telecommunication wavelengths. As a prototypical device we developed a metasurface comprising an array of aluminum nanoantennas directly placed on top of a V 2 O 5 layer (Figure 1a,b). The full layer stack (see the Methods section within the Supporting Information for details about the fabrication) also includes a platinum back plane, which has the main function of collecting/ injecting the balancing charge carried by electrons during the electrochemical intercalation process. This process took place in an electrochemical cell, following the procedure detailed in the Supporting Information. As an effect of intercalating a molar concentration x of Li ions, the V 2 O 5 material (which hence becomes Li x V 2 O 5 ) changes its permittivity according to Figure 1c: the major effect is observed on the imaginary part ε″, with a broad peak extending across the whole near-infrared spectral region, and values exceeding unity. This change of the complex permittivity is related to the mechanism of small polaron hopping, that is to the transfer of conduction electrons bound to the lattice ions to the neighboring orbitals (see the Supporting Information). It should be noticed that In the latest years the optical engineer's toolbox has welcomed a new concept, the m...

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mentioning

confidence: 86%

Metasurface Reconfiguration through Lithium‐Ion Intercalation in a Transition Metal Oxide

Zanotto

Blancato

Buchheit

et al. 2016

Advanced Optical Materials

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“…Plasmonic platforms, with the unique ability to confine and manipulate light through the resonant coupling of light to collective oscillations of free electrons in metals, are promising for enhancing the chiroptical response [12][13][14][15][16][17][18][19][20][21][22][23][24]. In particular, geometrically chiral plasmonic structures have been used to tailor and tune the far-and near-field chiroptical responses [25][26][27][28][29][30][31][32][33][34][35][36][37]. The interaction of plasmonic enhanced chiral near-field with a chiral molecule is favorable to optimize the selective light absorption by the molecule, which in turn optimizes the corresponding CD signal [38][39][40][41][42].…”

Section: Introductionmentioning

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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“…Recent study on local CD and thermallycontrolled chirality may open new opportunities for dynamic detection of the chiral molecules [20,21]. Usually, the chirality of a chiral structure is determined by its CD spectrum [22], but for the enhancement of chiral signal the chirality is determined by the local field. According to equation 2, the chiral near-field is proportional to the imaginary part of E * C • B C , which results in two different aspects that should be considered when optimizing the chiral near-field: on the one hand, the chiral near-field will increase and the included angle between the electric and magnetic fields decreases.…”

Section: Introductionmentioning

confidence: 99%

Chiral near-fields around chiral dolmen nanostructure

Fu¹,

Wang²,

Chen³

et al. 2017

J. Phys. D: Appl. Phys.

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View the article online for updates and enhancements. Related content Handedness-switchable chiral field in the 1D metal grooves for plasmonic circular dichroism spectroscopy Haizi Yao and Shuncong Zhong-Optical chiral metamaterials: a review of the fundamentals, fabrication methods and applications Zuojia Wang, Feng Cheng, Thomas Winsor et al.-Surface plasmon resonance in gold nanoparticles: a review

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Plasmonic chirality of L-shaped nanostructure composed of two slices with different thickness

Cited by 53 publications

References 37 publications

Metasurface Reconfiguration through Lithium‐Ion Intercalation in a Transition Metal Oxide

Metasurface Reconfiguration through Lithium‐Ion Intercalation in a Transition Metal Oxide

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

Chiral near-fields around chiral dolmen nanostructure

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