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Sun J, Wang X, Wu J, Jiang C, Shen J, Cooper MA, Zheng X, Liu Y, Yang Z, Wu D. Biomimetic Moth-eye Nanofabrication: Enhanced Antireflection with Superior Self-cleaning Characteristic. Sci Rep 2018; 8:5438. [PMID: 29615712 PMCID: PMC5883013 DOI: 10.1038/s41598-018-23771-y] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 03/20/2018] [Indexed: 11/09/2022] Open
Abstract
Sub-wavelength antireflection moth-eye structures were fabricated with Nickel mold using Roll-to-Plate (R2P) ultraviolet nanoimprint lithography (UV-NIL) on transparent polycarbonate (PC) substrates. Samples with well replicated patterns established an average reflection of 1.21% in the visible light range, 380 to 760 nm, at normal incidence. An excellent antireflection property of a wide range of incidence angles was shown with the average reflection below 4% at 50°. Compared with the unpatterned ultraviolet-curable resin coating, the resulting sub-wavelength moth-eye structure also exhibited increased hydrophobicity in addition to antireflection. This R2P method is especially suitable for large-area product preparation and the biomimetic moth-eye structure with multiple performances can be applied to optical devices such as display screens, solar cells, or light emitting diodes.
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Affiliation(s)
- Jingyao Sun
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.,Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, 43210, USA
| | - Xiaobing Wang
- Tumor Marker Research Center, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - Jinghua Wu
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Chong Jiang
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Jingjing Shen
- School of Civil Engineering & Architecture, Taizhou University, Zhejiang, 318000, China
| | - Merideth A Cooper
- Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, 43210, USA
| | - Xiuting Zheng
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Ying Liu
- State Key Laboratory of Organic-Inorganic Composites, Beijing, 100029, China
| | - Zhaogang Yang
- Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, 43210, USA.
| | - Daming Wu
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China. .,State Key Laboratory of Organic-Inorganic Composites, Beijing, 100029, China.
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Li Y, Fullager DB, Angelbello E, Childers D, Boreman G, Hofmann T. Broadband near-infrared antireflection coatings fabricated by three-dimensional direct laser writing. OPTICS LETTERS 2018; 43:239-242. [PMID: 29328249 DOI: 10.1364/ol.43.000239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 11/28/2017] [Indexed: 06/07/2023]
Abstract
Three-dimensional direct laser writing via two-photon polymerization is used to fabricate anti-reflective structured surfaces (ARSSs) composed of subwavelength conicoid features optimized to operate over a wide bandwidth in the near-infrared range from 3700 cm-1 to 6600 cm-1 (2.7-1.52 μm). Analytic Bruggemann effective medium calculations are used to predict nominal geometric parameters such as the fill factor of the constitutive conicoid features of the anti-reflective structured surfaces (ARSSs) presented here. The performance of the ARSSs was investigated experimentally using infrared reflection and transmission measurements. An enhancement of the transmittance by 1.35%-2.14% over a broadband spectral range from 3700 cm-1 to 6600 cm-1 (2.7-1.52 μm) was achieved. We further report on finite-element-based reflection and transmission data using three-dimensional (3D) model geometries for comparison. A good agreement between experimental results and the finite-element-based numerical analysis is observed once as-fabricated deviations from the nominal conicoid forms are included in the model. 3D direct laser writing is demonstrated here as an efficient method for the fabrication and optimization of ARSSs designed for the infrared spectral range.
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Fabrication of Luminescent Antireflective Coatings with CaMoO4:Eu3+/Ag Composite Structure. COATINGS 2017. [DOI: 10.3390/coatings7060074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Highly transparent and luminescent CaMoO4:Eu3+/Ag composite films were fabricated on glass substrates as multifunctional antireflective (AR) coatings. The films were deposited through a combination of a sol–gel dip-coating technique and a hot water treatment. With the addition of an aluminum source in coating solutions, the sol–gel-derived films underwent a remarkable microstructural change during the hot water treatment due to the reaction between an amorphous alumina phase and water. This change brought both an antireflective effect (suppression of Fresnel reflection) and luminescence enhancement (suppression of total internal reflection) to the films. The introduction of Ag nanoparticles into the films further increased luminescence intensity without losing the antireflective effect.
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Kim JG, Hsieh CH, Choi HJ, Gardener J, Singh B, Knapitsch A, Lecoq P, Barbastathis G. Conical photonic crystals for enhancing light extraction efficiency from high refractive index materials. OPTICS EXPRESS 2015; 23:22730-22739. [PMID: 26368241 DOI: 10.1364/oe.23.022730] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We propose, analyze and optimize a two-dimensional conical photonic crystal geometry to enhance light extraction from a high refractive index material, such as an inorganic scintillator. The conical geometry suppresses Fresnel reflections at an optical interface due to adiabatic impedance matching from a gradient index effect. The periodic array of cone structures with a pitch larger than the wavelength of light diffracts light into higher-order modes with different propagating angles, enabling certain photons to overcome total internal reflection (TIR). The numerical simulation shows simultaneous light yield gains relative to a flat surface both below and above the critical angle and how key parameters affect the light extraction efficiency. Our optimized design provides a 46% gain in light yield when the conical photonic crystals are coated on an LSO (cerium-doped lutetium oxyorthosilicate) scintillator.
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Saito A. Material design and structural color inspired by biomimetic approach. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2011; 12:064709. [PMID: 27877459 PMCID: PMC5090674 DOI: 10.1088/1468-6996/12/6/064709] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2011] [Revised: 01/24/2012] [Accepted: 12/05/2011] [Indexed: 05/20/2023]
Abstract
Generation of structural color is one of the essential functions realized by living organisms, and its industrial reproduction can result in numerous applications. From this viewpoint, the mechanisms, materials, analytical methods and fabrication technologies of the structural color are reviewed in this paper. In particular, the basic principles of natural photonic materials, the ideas developed from these principles, the directions of applications and practical industrial realizations are presented by summarizing the recent research results.
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Affiliation(s)
- Akira Saito
- Department of Precision Science and Technology, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871 Japan RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-Cho, Hyogo 679-5148, Japan
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