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Chen E, Yuan Q, Zhao YP. Topography-induced symmetry transition of droplets on quasi-periodically patterned surfaces. SOFT MATTER 2018; 14:6198-6205. [PMID: 29808212 DOI: 10.1039/c8sm00591e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Quasi-periodic structures of quasicrystals yield novel effects in diverse systems. However, there is little investigation on employing quasi-periodic structures in morphology control. Here, we show the use of quasi-periodic surface structures in controlling the transition of liquid droplets. Although surface structures seem random-like, we find that on these surfaces, droplets spread to well-defined 5-fold symmetric shapes and the symmetry of droplet shapes spontaneously restores during spreading, hitherto unreported in the morphology control of droplets. To obtain physical insights into these symmetry transitions, we conduct energy analysis and perform systematic experiments by varying the properties of both liquid droplets and patterned surfaces. The results show the dominant factors in determining droplet shapes to be surface topography and the self-similarity of the surface structure. Quantified results of the droplet spreading process show distinct dynamics from the spreading experiments on periodically micropatterned surfaces. Our findings significantly advance the control capability of the droplet morphology. Such a quasi-periodic patterning strategy can offer a new method to achieve complex patterns, and may be used to model patterns in the study of rough surfaces.
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Affiliation(s)
- Enhui Chen
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China.
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Galinski H, Favraud G, Dong H, Gongora JST, Favaro G, Döbeli M, Spolenak R, Fratalocchi A, Capasso F. Scalable, ultra-resistant structural colors based on network metamaterials. LIGHT, SCIENCE & APPLICATIONS 2017; 6:e16233. [PMID: 30167248 PMCID: PMC6062193 DOI: 10.1038/lsa.2016.233] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 09/20/2016] [Accepted: 09/25/2016] [Indexed: 05/03/2023]
Abstract
Structural colors have drawn wide attention for their potential as a future printing technology for various applications, ranging from biomimetic tissues to adaptive camouflage materials. However, an efficient approach to realize robust colors with a scalable fabrication technique is still lacking, hampering the realization of practical applications with this platform. Here, we develop a new approach based on large-scale network metamaterials that combine dealloyed subwavelength structures at the nanoscale with lossless, ultra-thin dielectric coatings. By using theory and experiments, we show how subwavelength dielectric coatings control a mechanism of resonant light coupling with epsilon-near-zero regions generated in the metallic network, generating the formation of saturated structural colors that cover a wide portion of the spectrum. Ellipsometry measurements support the efficient observation of these colors, even at angles of 70°. The network-like architecture of these nanomaterials allows for high mechanical resistance, which is quantified in a series of nano-scratch tests. With such remarkable properties, these metastructures represent a robust design technology for real-world, large-scale commercial applications.
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Affiliation(s)
- Henning Galinski
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge 02138, USA
- Laboratory for Nanometallurgy, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, Zurich 8093, Switzerland
| | - Gael Favraud
- PRIMALIGHT, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Hao Dong
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge 02138, USA
- Laboratory for Nanometallurgy, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, Zurich 8093, Switzerland
| | - Juan S Totero Gongora
- PRIMALIGHT, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | | | - Max Döbeli
- Ion Beam Physics, ETH Zurich, Otto-Stern-Weg 5, Zurich 8093, Switzerland
| | - Ralph Spolenak
- Laboratory for Nanometallurgy, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, Zurich 8093, Switzerland
| | - Andrea Fratalocchi
- PRIMALIGHT, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Federico Capasso
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge 02138, USA
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Yuan H, Jiang X, Huang F, Sun X. Broadband multiple responses of surface modes in quasicrystalline plasmonic structure. Sci Rep 2016; 6:30818. [PMID: 27492782 PMCID: PMC4974618 DOI: 10.1038/srep30818] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 07/11/2016] [Indexed: 11/09/2022] Open
Abstract
We numerically study the multiple excitation of surface modes in 2D photonic quasicrystal/metal/substrate structure. An improved rigorous coupled wave analysis method that can handle the quasicrystalline structure is presented. The quasicrystalline lattice, which refers to Penrose tiling in this paper, is generated by the cut-and-project method. The normal incidence spectrum presents a broadband multiple responses property. We find that the phase matching condition determines the excitation frequency for a given incident angle, while the depth of the reflection valley depends on the incident polarization. The modes will split into several sub-modes at oblique incidence, which give rise to the appearance of more responses on the spectrum.
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Affiliation(s)
- Haiming Yuan
- Department of Physics, Harbin Institute of Technology, Harbin 150001, China.,Key Lab of Micro-Optics and Photonic Technology of Heilongjiang Province, Harbin 150001, China
| | - Xiangqian Jiang
- Department of Physics, Harbin Institute of Technology, Harbin 150001, China.,Key Lab of Micro-Optics and Photonic Technology of Heilongjiang Province, Harbin 150001, China
| | - Feng Huang
- Department of Physics, Harbin Institute of Technology, Harbin 150001, China.,Key Lab of Micro-Optics and Photonic Technology of Heilongjiang Province, Harbin 150001, China
| | - Xiudong Sun
- Department of Physics, Harbin Institute of Technology, Harbin 150001, China.,Key Lab of Micro-Optics and Photonic Technology of Heilongjiang Province, Harbin 150001, China
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Ogier R, Shao L, Svedendahl M, Käll M. Continuous-Gradient Plasmonic Nanostructures Fabricated by Evaporation on a Partially Exposed Rotating Substrate. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:4658-64. [PMID: 27061280 DOI: 10.1002/adma.201600112] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 02/12/2016] [Indexed: 05/25/2023]
Abstract
A continuous-gradient approach of material evaporation is employed to fabricate nanostructures with varying geometric parameters, such as thickness, lateral positioning, and orientation on a single substrate. The method developed for mask lithography allows continuous tuning of the physical properties of a sample. The technique is highly valuable in simplifying the overall optimization process for constructing metasurfaces.
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Affiliation(s)
- Robin Ogier
- Department of Physics, Chalmers University of Technology, S41296, Gothenburg, Sweden
| | - Lei Shao
- Department of Physics, Chalmers University of Technology, S41296, Gothenburg, Sweden
| | - Mikael Svedendahl
- Department of Physics, Chalmers University of Technology, S41296, Gothenburg, Sweden
| | - Mikael Käll
- Department of Physics, Chalmers University of Technology, S41296, Gothenburg, Sweden
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Verre R, Svedendahl M, Odebo Länk N, Yang ZJ, Zengin G, Antosiewicz TJ, Käll M. Directional Light Extinction and Emission in a Metasurface of Tilted Plasmonic Nanopillars. NANO LETTERS 2016; 16:98-104. [PMID: 26625299 DOI: 10.1021/acs.nanolett.5b03026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Plasmonic optical antennas and metamaterials with an ability to boost light-matter interactions for particular incidence or emission angles could find widespread use in solar harvesting, biophotonics, and in improving photon source performance at optical frequencies. However, directional plasmonic structures have generally large footprints or require complicated geometries and costly nanofabrication technologies. Here, we present a directional metasurface realized by breaking the out-of-plane symmetry of its individual elements: tilted subwavelength plasmonic gold nanopillars. Directionality is caused by the complex charge oscillation induced in each individual nanopillar, which essentially acts as a tilted dipole above a dielectric interface. The metasurface is homogeneous over a macroscopic area and it is fabricated by a combination of facile colloidal lithography and off-normal metal deposition. Fluorescence excitation and emission from dye molecules deposited on the metasurface is enhanced in specific directions determined by the tilt angle of the nanopillars. We envisage that these directional metasurfaces can be used as cost-effective substrates for surface-enhanced spectroscopies and a variety of nanophotonic applications.
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Affiliation(s)
- R Verre
- Department of Applied Physics, Chalmers University of Technology , 412 96 Göteborg, Sweden
| | - M Svedendahl
- Department of Applied Physics, Chalmers University of Technology , 412 96 Göteborg, Sweden
| | - N Odebo Länk
- Department of Applied Physics, Chalmers University of Technology , 412 96 Göteborg, Sweden
| | - Z J Yang
- Department of Applied Physics, Chalmers University of Technology , 412 96 Göteborg, Sweden
| | - G Zengin
- Department of Applied Physics, Chalmers University of Technology , 412 96 Göteborg, Sweden
| | - T J Antosiewicz
- Department of Applied Physics, Chalmers University of Technology , 412 96 Göteborg, Sweden
- Centre of New Technologies, University of Warsaw , Banacha 2c, 02-097 Warsaw, Poland
| | - M Käll
- Department of Applied Physics, Chalmers University of Technology , 412 96 Göteborg, Sweden
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