Design and Fabrication of Three-Dimensional Chiral Nanostructures Based on Stepwise Glancing Angle Deposition Technology

Hou, Yidong; Li, Shuhong; Su, Yanling; Huang, Xia; Liu, Yu; Huang, Li; Yu, Yin; Gao, Fuhua; Zhang, Zhiyou; Du, Jinglei

doi:10.1021/la304122f

Cited by 42 publications

(39 citation statements)

References 28 publications

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“…Such ultrabroadband chiral resonance in the visible region has been rarely seen in previous studies and the measured CD strength is far more stronger than those reported previously for 3D helically stacked PCMs prepared by a similar GLAD method [3,36,37,40,41] (CD of ≈0.1 in ref. Such ultrabroadband chiral resonance in the visible region has been rarely seen in previous studies and the measured CD strength is far more stronger than those reported previously for 3D helically stacked PCMs prepared by a similar GLAD method [3,36,37,40,41] (CD of ≈0.1 in ref.…”

Section: Superposition Of Local Chiralitiesmentioning

confidence: 45%

“…[40] and ≈0.04° at normal incidence in ref. [36,37]. More importantly, we would like to point out that such an ultrabroadband superchiral response observed in our SPPCMs is originated from the formation of definite handedness in all microscale domains in the same sample and therefore it eliminates the problem of random local chiralities reported in refs.…”

Section: Superposition Of Local Chiralitiesmentioning

confidence: 53%

“…[33][34][35] Although these bottom-up methods can produce chiral metamolecules in large amount and at low cost, the chiral performance and structure reproducibility of the samples made with these methods often are not comparable to that fabricated by the aforementioned top-down techniques. Sophisticated modifications based on symmetry considerations to the deposition parameters used in previous GLAD recipes [36,37] eliminate the undesirable yet unavoidable nature of racemic mixture induced by the long-range disorder arrangement of the microsphere array, resulting in SPPCMs with definite handedness over macroscopic areas and consequently an order of magnitude enhancement of CD over nearly the whole visible spectrum. [27][28][29][30][31][32] Here, we propose a novel fabrication solution to address all above-mentioned issues associated with the current plasmonic chiral metamaterials and metamolecules.…”

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confidence: 99%

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Ultrabroadband Optical Superchirality in a 3D Stacked‐Patch Plasmonic Metamaterial Designed by Two‐Step Glancing Angle Deposition

Hou

Leung

Chan

et al. 2016

Adv Funct Materials

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7807wileyonlinelibrary.com respectively from the interaction of circularly or linearly polarized light with structurally chiral media in nature, such as chiral (bio)molecules and solids without any mirror symmetry. From the viewpoint of classical electrodynamics, the degeneracy between the helicity eigenmodes of light, i.e., left and right circularly polarized (LCP and RCP) waves, is broken due to cross coupling between the electric and magnetic dipoles in a chiral medium, leading to differential extinction (CD) or transmission (optical activity) for LCP/ RCP waves. These chiroptical effects provide an effective approach for manipulating polarization states of light in various optical and photonic applications, and also for sensing enantiomers of chemical molecules and determining structural conformation of biological molecules. However, these effects induced by magnetoelectric coupling in natural materials, particularly in biomolecules like amino acids, sugars, proteins, and viruses, are often very weak. [1] This unfavorable feature not only limits the ability of naturally occurring materials to effectively manipulate light polarization at the nanoscale, particularly for nanophotonics applications, but also severely restricts the application of chirality-sensitive spectroscopic techniques to samples at the microgram level. [1][2][3] Recently, plasmonic chiral metamaterials (PCMs) made of subwavelength metal nanostructures, artificially engineered chiral resonators that cannot be superimposed on their mirror images, have attracted a considerable amount of research interest. Compared with naturally occurring materials, they often have significantly enhanced chirality and thus enable many fascinating phenomena such as pronounced linear [4][5][6][7] and nonlinear chiroptical effects, [8,9] negative refraction, [10][11][12] manipulating Casimir effect, [13][14][15] unusual spin Hall effect of light, [16] and chiral-selective nonlinear imaging. [17,18] Depending on their spatial dimensions, the PCMs developed thus far can be either 2D (or planar) or 3D. The planar 2D PCMs are composed of periodic arrays of plasmonic resonators such as gold gammadions, [5,7] fish-scale, [19][20][21] and G-shape nanostructures, [22] and their chiroptical effects are generally asymmetric with respect Low-cost and large-scale fabrication of 3D chiral metamaterials is highly desired for potential applications such as nanophotonics devices and chiral biosensors. One of the promising fabrication methods is to use glancing angle deposition (GLAD) of metal on self-assembled dielectric microsphere array. However, structural handedness varies locally due to long-range disorder of the array and therefore large-scale realization of the same handedness is impossible. Here, using symmetry considerations a two-step GLAD process is proposed to eliminate this longstanding problem. In the proposed scheme, the unavoidable long-range disorder gives rise to microscale domains of the same handedness but of slightly different structural geometries and ultima...

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Section: Superposition Of Local Chiralitiesmentioning

confidence: 45%

Section: Superposition Of Local Chiralitiesmentioning

confidence: 53%

mentioning

confidence: 99%

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Ultrabroadband Optical Superchirality in a 3D Stacked‐Patch Plasmonic Metamaterial Designed by Two‐Step Glancing Angle Deposition

Hou

Leung

Chan

et al. 2016

Adv Funct Materials

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“…With the help of various masks, such random nanohole array [26], square nanoparticle array [27], and aligned ZnO nanorods [28], various CPS with chiroptical resonance located in the near-infrared and visible region have been achieved. Particularly, our previous work also demonstrates that with the help of assembled polystyrene (PS) sphere array, a kind of shell-like chiral nanostructures can be achieved [29]. This kind of CPS can combine the magnetic or dielectric spheres to form chiral “Janus particles” [30] or “patchy particles” [31, 32] and will find potential applications in the colloid field.…”

Section: Introductionmentioning

confidence: 99%

Scalable Fabrication of Quasi-Three-Dimensional Chiral Plasmonic Oligomers Based on Stepwise Colloid Sphere Lithography Technology

et al. 2015

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We report a simple and scalable method for the fabrication of spiral-type chiral plasmonic oligomers based on the stepwise colloid sphere lithography technology. Through carefully adjusting the azimuthal angle Φ of polystyrene (PS) sphere array monolayer and the deposition thickness kn, the chiral plasmonic oligomers composed of four achiral particles can be successfully fabricated on a desired substrate. And their chiral sign, i.e., left-hand or right-hand, is dependent on the anticlockwise or clockwise deposition sequence of the achiral particles. The measured results show a large chiroptical resonance in the visible region, and this resonance can be easily adjusted by using different sizes of PS spheres. Our in-depth theoretical and experimental researches further reveal that the obtained chiral plasmonic oligomers are indeed a kind of quasi-three-dimensional chiral nanostructures, which own a three-dimensional geometrical morphology, but with nonreciprocity chiroptical effect. The ease and scalability (>1 cm2) of the fabrication method make chiral plasmonic oligomers promising candidates for many applications, such as chiral biosensor and catalysis.

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“…However, all of these assemblies are based on patchy colloidal particles with symmetric patches (in most cases circular patches). Recent interest in asymmetric patches has been caused by the prediction and observation of the chiroptical effect for such patches, 15 which provides new applications for particles with patches of asymmetric shapes.…”

Section: ■ Introductionmentioning

confidence: 99%

Template-Assisted GLAD: Approach to Single and Multipatch Patchy Particles with Controlled Patch Shape

Kretzschmar

2013

Langmuir

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Template-assisted glancing angle deposition (GLAD) is explored for the fabrication of single and multipatch patchy particles with one or more patches of controlled but asymmetric shape. The template is used to ensure the formation of uniform patchy particles, whereas rotation of the template gives access to a large number of asymmetric patch shapes caused by the shadowing effect of the templating groove and/or the neighboring particle. Careful analysis with a straightforward geometric model reveals the effect of the angle of incidence, rotational angle, groove size, and particle size on the patch shape. Initial magnetic field assembly results are presented to illustrate the removal of patchy particles from their template and accessibility to a large number of patchy particles. Two-patch particles with overlapping patches are also accessible by means of secondary metal vapor deposition. The connectivity of these two patches on each particle and the predictable size of the overlapping section provide access to functional patchy particles. The combination of the template-assisted GLAD method with rotation of the template and secondary evaporation is demonstrated to be a good method for fabricating patchy particles with a variety of asymmetric patch shapes, sizes, and multipatches where every particle of a batch carries exactly the same patch pattern and thereby provides valuable input on experimentally accessible patch shapes for future experimental and computational studies of patchy particles.

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Design and Fabrication of Three-Dimensional Chiral Nanostructures Based on Stepwise Glancing Angle Deposition Technology

Cited by 42 publications

References 28 publications

Ultrabroadband Optical Superchirality in a 3D Stacked‐Patch Plasmonic Metamaterial Designed by Two‐Step Glancing Angle Deposition

Ultrabroadband Optical Superchirality in a 3D Stacked‐Patch Plasmonic Metamaterial Designed by Two‐Step Glancing Angle Deposition

Scalable Fabrication of Quasi-Three-Dimensional Chiral Plasmonic Oligomers Based on Stepwise Colloid Sphere Lithography Technology

Template-Assisted GLAD: Approach to Single and Multipatch Patchy Particles with Controlled Patch Shape

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