Lattice Collective Interaction Engineered Optical Activity in Metamaterials

Xie, Fei; Wu, Wei; Ren, Mengxin; Cai, Wei; Xu, Jingjun

doi:10.1002/adom.201901435

Cited by 18 publications

(8 citation statements)

References 43 publications

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“…To support SLRs, a sample must fulfill at least four criteria: i) the plasmonic particles are arranged in a proper lattice, [ 40,41 ] ii) with a sufficiently large domain size (≈20 particles), [ 17,42,43 ] iii) with a lateral interparticle spacing that leads to grazing orders of diffraction that spectrally overlap with the LSPR, [ 44 ] iv) within a homogenous refractive index environment. [ 1,2 ] These criteria can be fulfilled on smaller array sizes using conventional lithography approaches, allowing for the appearance of very sharp SLR features.…”

Section: Figurementioning

confidence: 99%

“…Thus, we expect that the single crystalline domains contain at least 31 particles, which is sufficient to support SLRs. [ 17,42,43 ] Figure 2d exemplarily shows the analysis of two characteristic samples with different interparticle distances ( D hex = 658 nm and 684 nm; see Figure S2a, Supporting Information, for the full set of samples). As a result of the normalization, the peak at r / D hex = 1 appears as the global maximum (Figure 2d).…”

Section: Figurementioning

confidence: 99%

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Chiral Surface Lattice Resonances

et al. 2020

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resonances. [5,6] A collective excitation (SLR) possesses a reduced linewidth as compared to the excitation of the LSPRs in nanoparticle ensembles. [1][2][3][4] Thus, SLRs can provide high quality-factor metasurfaces with substantial impact in nanophotonic and sensing applications. [1][2][3][4] Oblique incidence on planar metasurfaces constructed of an array of split-ring resonators showed that SLRs can also selectively respond to the handedness of circularly polarized light, causing sharp lattice-mode assisted extrinsic circular dichroism. [7,8] The spectral position of these SLRs can be tuned by the angle of incidence, leading to the emergence of extrinsic chiral surface lattice resonances. [9][10][11][12] Strong optical activity can also result from plasmonic 3D nanostructures without mirror symmetry. However, SLRs from arrays of 3D building-blocks with intrinsic chirality remain unexplored, but promise decreased losses and enhanced optical activity. [1,13] The fabrication of chiral 3D nanostructures is challenging for both, bottom-up and top-down methods. [14][15][16] Recently, the excitation of SLRs was seen in self-assembled, large area colloidal systems. [17,18] Such systems offer the possibility for fast manufacturing and covering large-areas on different substrate materials. [19] Colloid-based materials allow for embedding of nanoparticle arrays into flexible free-standing polymer films, [20] enabling the design of mechanically tunable [21] and stimuliresponsive hydrogel membranes. [22] Here, we use colloidal lithography [23][24][25] to fabricate arrays of 3D crescents with a selective response to the handedness of incident circularly polarized light, and we experimentally demonstrate handedness-dependent (chiral) SLRs at normal incidence. Colloidal lithography [23][24][25] is an experimentally simple and fast process to fabricate 3D chiral plasmonic nanostructures. [26][27][28] However, a necessary condition to observe SLRs in such nanostructure arrays is that their lattice constant must be in the range of the wavelength of the LSPRs of the individual nanostructures. [1][2][3][4] For objects with resonances in the near-infrared, such as, for example, split ring resonators, this requires large interparticle distances approaching the micrometer range. For conventional colloidal lithography processes, which depend on the controlled shrinkage of a polymer particle matrix, such distances are not easily achievable. [12,[28][29][30] Therefore, we use core-shell particles with rigid cores (silica) and soft, deformable polymer shells. [31,32] The particles selfassemble into hexagonally ordered monolayers at the air/water Collective excitation of periodic arrays of metallic nanoparticles by coupling localized surface plasmon resonances to grazing diffraction orders leads to surface lattice resonances with narrow line width. These resonances may find numerous applications in optical sensing and information processing. Here, a new degree of freedom of surface lattice resonances is experimentally investigated by dem...

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Chiral Surface Lattice Resonances

et al. 2020

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“…In the field of metamaterials and metasurfaces, there is a wide range of options for the design and fabrication of various artificial lattices. People have developed numerous methods to break the mirror symmetry and realize chiral structures, such as single asymmetric structures, [1,2] monolayer asymmetric patterns, [3] structures with intrinsic [4,5] or extrinsic chirality, [6] three-dimensional chiral structures, [7] and nano-kirigami. [8] To further improve the performance of artificial lattices, bilayer metasurfaces with better circular dichroism (CD) or broader bandwidth have also been developed.…”

Section: Introductionmentioning

confidence: 99%

Manipulating the Chirality of Moiré Metasurface by Symmetry Breaking

Lyu

Jia

et al. 2023

Laser & Photonics Reviews

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The chirality of materials is of great significance in many fields. Metasurfaces with chirality have attracted great attention in the past decades because of their ability to miniaturize the device into the nanoscale. An important class of chiral metasurfaces is the Moiré pattern assembled by two layers of metasurfaces. However, Moiré metasurfaces usually have limited circular dichroism. Here, the origin and the limiting factor of the chirality of Moiré metasurfaces using the chiral coupled oscillator model is analyzed. It is demonstrated that, with the help of a non-Hermitian Hamiltonian, the chirality can be improved by breaking the symmetry in the positive and negative k directions. The best result is achieved when both the two components have lowest transmission. In addition, the chiral anisotropy of a Moiré metasurface in full momentum space is studied, and it is shown that the chirality can be further improved in certain directions. The chiral anisotropy of Moiré metasurfaces may be used in applications such as optical information storage, structured color, unidirectional light coupling, sensitive chiral sensors, chiral nonlinear optics, chiral lasers, and Bose-Einstein condensation.

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“…In addition, the spectral response of quasi-BIC mode reveals the sharp Fano features, which indicates the phase transition can be engineered through modifying the structural parameters or the excitation conditions [7], [12]- [15]. The abrupt phase transition resembling the functionality arisen by the chiral molecules or chiral structures is of great use to achieve the strong optical activity [16], [17].…”

mentioning

confidence: 99%

Dual Quasi-Bound States in the Continuum Modes for Optical Activity Manipulation

Shen

Ren

et al. 2021

IEEE Photonics J.

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Quasi-bound states in the continuum (quasi-BIC) are a particular resonant state, which can be regulated by the degree of symmetry breaking in nanostructures. Here, we propose a fourfold rotationally symmetric (C 4v ) metasurface supporting the dual quasi-BIC modes. The Fano characteristics have observed in the near-infrared region. The resonant peaks of the dual quasi-BIC modes can be adjusted flexibly and independently with a simple breaking of the structural symmetry. More importantly, the dual quasi-BIC modes demonstrate the extraordinary capability in controlling the optical activity. This work will offer us more freedom for controlling the resonance and optical activity by the quasi-BIC modes, which is promising to engineer the optical device in displaying and optics communications.

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Lattice Collective Interaction Engineered Optical Activity in Metamaterials

Cited by 18 publications

References 43 publications

Chiral Surface Lattice Resonances

Chiral Surface Lattice Resonances

Manipulating the Chirality of Moiré Metasurface by Symmetry Breaking

Dual Quasi-Bound States in the Continuum Modes for Optical Activity Manipulation

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