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Nagato K, Takahashi K, Yajima Y, Nakao M. Laser-assisted direct roller imprinting of large-area microstructured optical surfaces. MICROSYSTEMS & NANOENGINEERING 2024; 10:9. [PMID: 38261881 PMCID: PMC10796369 DOI: 10.1038/s41378-024-00650-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 11/01/2023] [Accepted: 11/27/2023] [Indexed: 01/25/2024]
Abstract
In this study, a high-throughput fabrication method called laser-assisted direct roller imprinting (LADRI) was developed to lower the cost of nanoimprinting large-area polymer films and to address problems associated with nanoimprinting, namely, microstructural damage and precision in flatness of entire film. With LADRI, the laser directly heats the microstructured surface of the roller mold, which heats and melts the surface of a polymethyl methacrylate (PMMA) film to replicate the microstructures on the mold rapidly. In this study, the effects of laser power density, scanning speed, size of the microstructures, and contact pressure on the replication speed were investigated experimentally. The replication speed increased as the power and scanning speed increased. However, because the film required heating until it filled the entire depth of the microstructure, an appropriate replication speed was necessary. This result was supported by simulation of the temperature distribution inside the mold and the PMMA using transient heat conduction analyses. To demonstrate the applications of LADRI, two different optical surfaces were replicated: an antireflection (AR) structure with conical structures sized several hundred nanometers and a light-extraction structure with a microlens array (MLA) comprising 10 μm lenses, for display and illumination, respectively. The replication degree of the MLA was governed by the contact pressure. Polymer flow simulation indicated that the heat conduction and flow speeds of the melted PMMA surface were comparable within several tens of micrometers. In addition, the reflectivity of the AR structure decreased from 4 to 0.5%, and the light intensity of the light-extraction structure increased by a factor of 1.47.
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Affiliation(s)
- Keisuke Nagato
- Department of Mechanical Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656 Japan
| | - Ken Takahashi
- Department of Mechanical Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656 Japan
| | - Yuki Yajima
- Department of Mechanical Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656 Japan
| | - Masayuki Nakao
- Department of Mechanical Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656 Japan
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Self-assembled plasmonics for angle-independent structural color displays with actively addressed black states. Proc Natl Acad Sci U S A 2020; 117:13350-13358. [PMID: 32493745 PMCID: PMC7306820 DOI: 10.1073/pnas.2001435117] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Functional nanomaterials will enable the next generation of displays, detectors, and photovoltaic devices by interacting with light at subwavelength length scales. However, performance and practical integration with current electronic systems remain a scientific and engineering challenge. Here, we report the wafer-scale self-assembly/growth of nanoparticles which reproduce the cyan, magenta, and yellow color space. We explore the physics of the optical resonances and the advantageous properties they manifest for color filter technology, such as angle insensitivity and high saturation. The versatile formation process then enables integration with commercial devices to realize a hybrid, nanoparticle–liquid crystal reflective display. Nanostructured plasmonic materials can lead to the extremely compact pixels and color filters needed for next-generation displays by interacting with light at fundamentally small length scales. However, previous demonstrations suffer from severe angle sensitivity, lack of saturated color, and absence of black/gray states and/or are impractical to integrate with actively addressed electronics. Here, we report a vivid self-assembled nanostructured system which overcomes these challenges via the multidimensional hybridization of plasmonic resonances. By exploiting the thin-film growth mechanisms of aluminum during ultrahigh vacuum physical vapor deposition, dense arrays of particles are created in near-field proximity to a mirror. The sub-10-nm gaps between adjacent particles and mirror lead to strong multidimensional coupling of localized plasmonic modes, resulting in a singular resonance with negligible angular dispersion and ∼98% absorption of incident light at a desired wavelength. The process is compatible with arbitrarily structured substrates and can produce wafer-scale, diffusive, angle-independent, and flexible plasmonic materials. We then demonstrate the unique capabilities of the strongly coupled plasmonic system via integration with an actively addressed reflective liquid crystal display with control over black states. The hybrid display is readily programmed to display images and video.
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3
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Mader S, Martin OJF. Mechanisms of perfect absorption in nano-composite systems. OPTICS EXPRESS 2018; 26:27089-27100. [PMID: 30469783 DOI: 10.1364/oe.26.027089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 09/21/2018] [Indexed: 06/09/2023]
Abstract
Recently, it was noted that losses in plasmonics can also enable several useful optical functionalities. One class of structures that can maximize absorption are metal insulator metal systems. Here, we study 3-layer systems with a nano-composite metal layer as top layer. These systems can absorb almost 100% of light at visible frequencies, even though they contain only dielectrics and highly reflecting metals. We elucidate the underlying physical phenomenon that leads to this extraordinary high and broadband absorption. A comprehensive study of the particle material and shape, mirror material and dielectric spacer thickness is provided to identify their influence on the overall absorption. Thus, we can provide detailed design guidelines for realizing optical functionalities that require near-perfect absorption over specific wavelength bands. Our results reveal the strong role of lossy Fabry-Perot interference within these systems despite their thickness being well below half a wavelength.
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Zhu Z, Yoshikawa H, Saito M, Fan B, Tamiya E. Fabrication of Surface-enhanced Raman Spectroscopy (SERS) - Active Electrodes by Silver Sputtering Deposition for Electrochemical SERS Analysis. ELECTROANAL 2018. [DOI: 10.1002/elan.201800003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Zicheng Zhu
- Department of Applied Physics, Tamiya Laboratory; Osaka University; 2-1 Yamadaoka Suita, Osaka Japan
| | - Hiroyuki Yoshikawa
- Department of Applied Physics, Tamiya Laboratory; Osaka University; 2-1 Yamadaoka Suita, Osaka Japan
| | - Masato Saito
- Department of Applied Physics, Tamiya Laboratory; Osaka University; 2-1 Yamadaoka Suita, Osaka Japan
- Advanced Photonics and Biosensing Open Innovation Laboratory; AIST-Osaka University
| | - Bin Fan
- Optorun; Takeno 10-1 Kawagoe, Saitama Japan
| | - Eiichi Tamiya
- Department of Applied Physics, Tamiya Laboratory; Osaka University; 2-1 Yamadaoka Suita, Osaka Japan
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Rankin A, McGarry S. A flexible pressure responsive device based on the interaction between silver nanoparticles and an aluminum reflector. NANOTECHNOLOGY 2018; 29:015503. [PMID: 29095144 DOI: 10.1088/1361-6528/aa97bd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The unique and tunable optical properties of metal nanoparticles have attracted intense and sustained academic attention in recent years. In tandem with the demand for low-cost responsive materials, one particular topic of interest is the development of mechanically responsive device structures. This work describes the design, fabrication, and testing of a mechanically responsive plasmonic device structure that has been integrated onto a standard commercial plastic substrate. With a low actuation force and a visually perceivable color shift, this device would be attractive for applications requiring responsive features that can be activated by the human hand.
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Affiliation(s)
- Alasdair Rankin
- Carleton University, Department of Electronics, Ottawa, Canada
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Liu S, Plawsky JL. Solid-State Dewetting of Gold Aggregates/Islands on TiO 2 Nanorod Structures Grown by Oblique Angle Deposition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:14066-14077. [PMID: 29148790 DOI: 10.1021/acs.langmuir.7b03259] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A composite film made of a stable gold nanoparticle (NP) array with well-controlled separation and size atop a TiO2 nanorod film was fabricated via the oblique angle deposition (OAD) technique. The fabrication of the NP array is based on controlled, Rayleigh-instability-induced, solid-state dewetting of as-deposited gold aggregates on the TiO2 nanorods. It was found that the initial spacing between as-deposited gold aggregates along the vapor flux direction should be greater than the TiO2 interrod spacing created by 80° OAD to control dewetting and produce NP arrays. A numerical investigation of the process was conducted using a phase-field modeling approach. Simulation results showed that coalescence between neighboring gold aggregates is likely to have caused the uncontrolled dewetting in the 80° deposition, and this could be circumvented if the initial spacing between gold aggregates is larger than a critical value smin. We also found that TiO2 nanorod tips affect dewetting dynamics differently than planar TiO2. The topology of the tips can induce contact line pinning and an increase in the contact angle along the vapor flux direction to the supported gold aggregates. These two effects are beneficial for the fabrication of monodisperse NPs based on Rayleigh-instability-governed self-assembly of materials, as they help to circumvent the undesired coalescence and facilitate the instability growth on the supported material. The findings uncover the application potential of OAD as a new method to fabricate structured films as template substrates to mediate dewetting. The reported composite films would have uses in optical coatings and photocatalytic systems, taking advantage of their ability to combine plasmonic nanostructures within a nanostructured dielectric film.
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Affiliation(s)
- Shizhao Liu
- The Howard P. Isermann Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute , Troy, New York 12180, United States
| | - Joel L Plawsky
- The Howard P. Isermann Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute , Troy, New York 12180, United States
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Hedayati MK, Faupel F, Elbahri M. Review of Plasmonic Nanocomposite Metamaterial Absorber. MATERIALS (BASEL, SWITZERLAND) 2014; 7:1221-1248. [PMID: 28788511 PMCID: PMC5453083 DOI: 10.3390/ma7021221] [Citation(s) in RCA: 134] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 01/28/2014] [Accepted: 02/07/2014] [Indexed: 01/28/2023]
Abstract
Plasmonic metamaterials are artificial materials typically composed of noble metals in which the features of photonics and electronics are linked by coupling photons to conduction electrons of metal (known as surface plasmon). These rationally designed structures have spurred interest noticeably since they demonstrate some fascinating properties which are unattainable with naturally occurring materials. Complete absorption of light is one of the recent exotic properties of plasmonic metamaterials which has broadened its application area considerably. This is realized by designing a medium whose impedance matches that of free space while being opaque. If such a medium is filled with some lossy medium, the resulting structure can absorb light totally in a sharp or broad frequency range. Although several types of metamaterials perfect absorber have been demonstrated so far, in the current paper we overview (and focus on) perfect absorbers based on nanocomposites where the total thickness is a few tens of nanometer and the absorption band is broad, tunable and insensitive to the angle of incidence. The nanocomposites consist of metal nanoparticles embedded in a dielectric matrix with a high filling factor close to the percolation threshold. The filling factor can be tailored by the vapor phase co-deposition of the metallic and dielectric components. In addition, novel wet chemical approaches are discussed which are bio-inspired or involve synthesis within levitating Leidenfrost drops, for instance. Moreover, theoretical considerations, optical properties, and potential application of perfect absorbers will be presented.
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Affiliation(s)
- Mehdi Keshavarz Hedayati
- Nanochemistry and Nanoengineering, Faculty of Engineering, Institute for Materials Science, Christian-Albrechts-Universität zu Kiel, Kaiserstrasse 2, Kiel 24143, Germany.
| | - Franz Faupel
- Chair for Multicomponent Materials, Faculty of Engineering, Institute for Materials Science, Christian-Albrechts-Universität zu Kiel, Kaiserstrasse 2, Kiel 24143, Germany.
| | - Mady Elbahri
- Nanochemistry and Nanoengineering, Faculty of Engineering, Institute for Materials Science, Christian-Albrechts-Universität zu Kiel, Kaiserstrasse 2, Kiel 24143, Germany.
- Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, Geesthacht 21502, Germany.
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Meyerbröker N, Kriesche T, Zharnikov M. Novel ultrathin poly(ethylene glycol) films as flexible platform for biological applications and plasmonics. ACS APPLIED MATERIALS & INTERFACES 2013; 5:2641-2649. [PMID: 23484667 DOI: 10.1021/am400065f] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We present a novel approach to prepare ultrathin, biocompatible films based on cross-linking of multi-functionalized, star-branched poly(ethylene glycols) (STAR-PEGs) with tunable film thicknesses of 4-200 nm. A two-component mixture of amine- and epoxy-terminated four-arm STAR-PEGs (MN=2000 g/mol) was spin-coated on a flat substrate. Gentle heating induced an extensive chemical cross-linking of the macromonomers, resulting in a stable, hydrogel-like film with a density close to that of bulk PEG material. The cross-linking process could be monitored in situ, exhibiting the expected kinetics. The films revealed pronounced swelling behavior, which was fully reversible and could be precisely controlled. Additionally, they provided a high affinity to citrate-stabilized gold nanoparticles (AuNP) that could be adsorbed with high densities into the PEG matrix from an aqueous solution. These novel PEG/AuNP composite films offer interesting and potentially useful optical properties. The adsorption could also be performed in a lithographic fashion, resulting in AuNP patterns imbedded into the PEG matrix.
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Affiliation(s)
- Nikolaus Meyerbröker
- Angewandte Physikalische Chemie, Universität Heidelberg, 69120 Heidelberg, Germany
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9
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Namura K, Suzuki M, Nakajima K, Kimura K. Photoacoustic emission from Au nanoparticles arrayed on thermal insulation layer. OPTICS EXPRESS 2013; 21:8689-8700. [PMID: 23571958 DOI: 10.1364/oe.21.008689] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Efficient photoacoustic emission from Au nanoparticles on a porous SiO(2) layer was investigated experimentally and theoretically. The Au nanoparticle arrays/porous SiO(2)/SiO(2)/Ag mirror sandwiches, namely, local plasmon resonators, were prepared by dynamic oblique deposition (DOD). Photoacoustic measurements were performed on the local plasmon resonators, whose optical absorption was varied from 0.03 (3%) to 0.95 by varying the thickness of the dielectric SiO(2) layer. The sample with high absorption (0.95) emitted a sound that was eight times stronger than that emitted by graphite (0.94) and three times stronger than that emitted by the sample without the porous SiO(2) layer (0.93). The contribution of the porous SiO(2) layer to the efficient photoacoustic emission was analyzed by means of a numerical method based on a one-dimensional heat transfer model. The result suggested that the low thermal conductivity of the underlying porous layer reduces the amount of heat escaping from the substrate and contributes to the efficient photoacoustic emission from Au nanoparticle arrays. Because both the thermal conductivity and the spatial distribution of the heat generation can be controlled by DOD, the local plasmon resonators produced by DOD are suitable for the spatio-temporal modulation of the local temperature.
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Affiliation(s)
- Kyoko Namura
- Department of Micro Engineering, Kyoto University, Kyoto 606-8501, Japan.
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10
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Szmacinski H, Badugu R, Mahdavi F, Blair S, Lakowicz JR. Large Fluorescence Enhancements of Fluorophore Ensembles with Multilayer Plasmonic Substrates: Comparison of Theory and Experimental Results. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2012; 116:21563-21571. [PMID: 24163712 PMCID: PMC3806109 DOI: 10.1021/jp3072876] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Multilayer substrates consisting of a glass slide, silver mirror, silica layer, and silver nanoparticles were fabricated using magnetron sputtering. This new geometry of substrates with backplane mirror and dielectric photonic cavity produced large average fluorescence enhancements up to 190-fold. Fluorescence enhancements of five fluorescent probes were measured over the broad spectral range from 470 to 800 nm. Fluorescent probes were streptavidin conjugates attached to the substrate surface through a layer of biotinylated bovine serum albumin. The protein layers represent a common surface modification for surface-based bioassays such as immunoassays or molecular diagnostic assays. We found that optimal enhancement is dependent on the thickness of the dielectric layer separating the silver mirror and the silver nanoparticles and on the spectral range. We performed numerical calculations for enhancement in both the excitation and emission using finite element method (FEM) the results of which were in qualitative agreement with the experimental results. The described method for fabrication multilayered substrates and the results obtained with protein layers demonstrate great potential for the design of simple and ultrasensitive fluorometric bioassays with large optical amplifications compared to the standard approaches of enzyme-based bioassays with dielectric surfaces.
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Affiliation(s)
- Henryk Szmacinski
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland Baltimore, 725 W. Lombard Street, Baltimore, Maryland 21201, United States
| | - Ramachandram Badugu
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland Baltimore, 725 W. Lombard Street, Baltimore, Maryland 21201, United States
| | - Farhad Mahdavi
- Department of Electrical and Computer Engineering, University of Utah, 50 S. Central Campus Drive, Room 3280, Salt Lake City, Utah 84112, United States
| | - Steve Blair
- Department of Electrical and Computer Engineering, University of Utah, 50 S. Central Campus Drive, Room 3280, Salt Lake City, Utah 84112, United States
| | - Joseph R. Lakowicz
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland Baltimore, 725 W. Lombard Street, Baltimore, Maryland 21201, United States
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11
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Amotchkina TV, Trubetskov MK, Tikhonravov AV, Janicki V, Sancho-Parramon J, Zorc H. Comparison of two techniques for reliable characterization of thin metal-dielectric films. APPLIED OPTICS 2011; 50:6189-6197. [PMID: 22108876 DOI: 10.1364/ao.50.006189] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In the present study we determine the optical parameters of thin metal-dielectric films using two different characterization techniques based on nonparametric and multiple oscillator models. We consider four series of thin metal-dielectric films produced under various deposition conditions with different optical properties. We compare characterization results obtained by nonparametric and multiple oscillator techniques and demonstrate that the results are consistent. The consistency of the results proves their reliability.
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12
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Amotchkina TV, Janicki V, Sancho-Parramon J, Tikhonravov AV, Trubetskov MK, Zorc H. General approach to reliable characterization of thin metal films. APPLIED OPTICS 2011; 50:1453-1464. [PMID: 21460914 DOI: 10.1364/ao.50.001453] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Optical constants of thin metal films are strongly dependent on deposition conditions, growth mode, and thickness. We propose a universal characterization approach that allows reliable determination of thin metal film optical constants as functions of wavelength and thickness. We apply this approach to determination of refractive index dispersion of silver island films embedded between silica layers.
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Affiliation(s)
- Tatiana V Amotchkina
- Research Computing Center, Moscow State University, Leninskie Gory, 119992, Moscow, Russia
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13
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Shoute LCT. Multilayer Substrate-Mediated Tuning Resonance of Plasmon and SERS EF of Nanostructured Silver. Chemphyschem 2010; 11:2539-45. [DOI: 10.1002/cphc.201000351] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Suzuki M, Takada A, Yamada T, Hayasaka T, Sasaki K, Takahashi E, Kumagai S. Low-reflective wire-grid polarizers with absorptive interference overlayers. NANOTECHNOLOGY 2010; 21:175604. [PMID: 20368684 DOI: 10.1088/0957-4484/21/17/175604] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Wire-grid (WG) polarizers with low reflectivity for visible light have been successfully developed. We theoretically consider the optical properties of simple sandwich structures of absorptive layer/transparent layer (gap layer)/high-reflective mirrors and found that it is possible to develop an antireflection (AR) coating owing to the interference along with the absorption in the absorptive layer. A wide variety of materials can be used for AR coatings by tuning the thicknesses of both the absorptive and the gap layers. This AR concept has been applied to reduce the reflectance of WG polarizers of Al. FeSi(2) as an absorptive layer has been deposited by the glancing angle deposition technique immediately on the top of Al wires covered with a thin SiO(2) layer as a gap layer. For the optimum combination of the thicknesses of FeSi(2) and SiO(2), the reflectance becomes lower than a few per cent, independent of the polarization, whereas the transmission polarization properties remain good. Because low-reflective (LR) WG polarizers are completely composed of inorganic materials, they are useful for applications requiring high-temperature durability such as liquid crystal projection displays.
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Affiliation(s)
- Motofumi Suzuki
- Department of Micro Engineering, Kyoto University, Kyoto, Japan
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15
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Kuchler I, Pittner F, Pittner G, Sontag G. Development of a metal-island-coated swelling/shrinking copolymer sensor for measurement of divalent metal ions. MONATSHEFTE FUR CHEMIE 2010. [DOI: 10.1007/s00706-009-0243-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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16
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Roth SV, Kuhlmann M, Walter H, Snigirev A, Snigireva I, Lengeler B, Schroer CG, Burghammer M, Riekel C, Müller-Buschbaum P. Colloidal silver nanoparticle gradient layer prepared by drying between two walls of different wettability. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:264012. [PMID: 21828460 DOI: 10.1088/0953-8984/21/26/264012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A one-dimensional silver (Ag) nanoparticle gradient layer is prepared from an aqueous colloidal solution upon a polystyrene (PS) coated silicon (Si) substrate. For preparation two walls of different wettability are used. The 40 nm PS-layer exhibits a locally constant film thickness due to the strong roughness correlation with the underlying Si-substrate and is less wettable as compared to the glass plate placed above. The Ag nanoparticles have a triangular prism-like shape. The structural characterization of the obtained complex gradient formed by drying is performed with microbeam grazing incidence small-angle x-ray scattering based on compound refractive lenses. Due to the adsorption from aqueous solution in the selective geometry a double gradient type structure defined by two areas with characteristic lateral lengths and a cross-over regime between both is observed.
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Affiliation(s)
- S V Roth
- HASYLAB at DESY, Notkestraße 85, D-22607 Hamburg, Germany
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17
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Biomimetic sensor chip monitoring real-time food degradation: correlating chemical deterioration with microbiological status. MONATSHEFTE FUR CHEMIE 2009. [DOI: 10.1007/s00706-009-0144-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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18
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Dahint R, Trileva E, Acunman H, Konrad U, Zimmer M, Stadler V, Himmelhaus M. Optically responsive nanoparticle layers for the label-free analysis of biospecific interactions in array formats. Biosens Bioelectron 2007; 22:3174-81. [PMID: 17416516 DOI: 10.1016/j.bios.2007.02.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2007] [Revised: 02/13/2007] [Accepted: 02/14/2007] [Indexed: 10/23/2022]
Abstract
A novel nanocomposite surface is prepared by coating surface-adsorbed dielectric colloidal particles with a contiguous layer of gold nanoparticles. The resulting surface shows pronounced optical extinction in reflection with the extinction peaks located in the UV-Vis and NIR region of the electromagnetic spectrum. The peak positions of these maxima change very sensitively with the adsorption of organic molecules onto the surface. For the adsorption of a monolayer of octadecanethiol, we observe a peak shift of 55 nm on average, which is about five times that of established label-free sensing methods based on propagating and localized surface plasmons. In a first proof-of-principle experiment, the interaction of peptides with specific antibodies has been detected without labeling by means of a fiber-optical set-up with microscopic lateral resolution. To avoid crosstalk in high-density arrays, the optically responsive surface areas can be locally separated on a micro- or even nanometer scale. Accordingly, the newly developed optically responsive surfaces are well suited for integration into high-density peptide or DNA arrays as demanded in genomics, proteomics, and biomedical research in general.
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Affiliation(s)
- Reiner Dahint
- Applied Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany.
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Cesario J, Quidant R, Badenes G, Enoch S. Electromagnetic coupling between a metal nanoparticle grating and a metallic surface. OPTICS LETTERS 2005; 30:3404-6. [PMID: 16389846 DOI: 10.1364/ol.30.003404] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The electromagnetic coupling between a two-dimensional grating of resonant gold nanoparticles and a gold metallic film is investigated. We report on the observation of multipeaks in the extinction spectra attributed to resonant modes of the hybrid system, resulting from the coupling between the localized plasmon of the nanoparticles with the underlying surface plasmon mode. Simulations based on the Fourier modal method give good agreement with the experimental measurements and allow for the identification of the respective contributions.
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Affiliation(s)
- Jean Cesario
- ICFO-Institut de Ciències Fotòniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain
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Palkovits R, Mayer C, Bauer G, Winkler H, Pittner F, Schalkhammer T. Structural behavior of nanometric carbohydrate films transduced by a resonant technique. Biopolymers 2003; 69:333-42. [PMID: 12833260 DOI: 10.1002/bip.10371] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
New optical nanoresonance effects enabled us to study the effect of ions on nanometric carbohydrate thin layers on chips. Immobilization was done via spin coating of the derivatized carbohydrate polymer at a metallized chip surface forming ultrathin films (about 50-300 nm thick) followed by photochemical cross-linking. Deposition of metal-nanoclusters, synthesized by chemical means and sputter coating on top of the polymer, induced an optical resonance effect, which transduced changes of polymer structure quantitatively into an optical signal that can be observed directly as resonance shift of a narrow optical peak. The response of the sensor chip even visible to the eye was quantified spectroscopically in the visible and ir range of the spectrum. The lifetime of thin film was good, and thus application as a sensor was limited only by the mechanical stability of the reactive matrix, but not by photobleaching or molecular leakage. Due to the inherent hydrophilic nature of the alginate polymer, the response time of this new sensor is governed by simple aqueous diffusion of the ionic calcium for up to 300 nm completed within less than one second. Monitoring of calcium fluctuations in a high background of magnesium and even serum was demonstrated with a dynamic range optimal for physiological measurements and a linear response up to 5 mM. Surface and alignment of polymer chain were influenced by the nanostructure of the supporting metal film-contrary to alginic acid, chitosan was deposited well aligned to the nanocrystals of the support.
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Affiliation(s)
- Roland Palkovits
- Institute for Biochemistry and Molecular Cell Biology, and L. Boltzmann Forschungsstelle für Biochemie, University of Vienna, 1030 Wien, Austria
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Takei H, Himmelhaus M, Okamoto T. Absorption spectrum of surface-bound cap-shaped gold particles. OPTICS LETTERS 2002; 27:342-344. [PMID: 18007797 DOI: 10.1364/ol.27.000342] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A surface-adsorbed monolayer of cap-shaped gold particles upon submicrometer-sized polystyrene spheres exhibits pronounced absorption in the visible region. When the surrounding refractive index was altered by immersion in a fluid, the direction of the shift in the absorption spectrum was dependent on the incidence angle of the irradiation. When a thiol molecule, known to adsorb selectively on gold upon polystyrene, was added, the resultant shift in the absorption spectrum's peak was consistently toward longer wavelengths. Consequently, at certain incidence angles, a change in the refractive index of the surrounding fluid produces no shift, whereas thiol adsorption results in a clear shift, apparently reflecting the different spatial regions in which the refractive index is altered by these two procedures.
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22
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Mayer C, Stich N, Palkovits R, Bauer G, Pittner F, Schalkhammer T. High-throughput assays on the chip based on metal nano-cluster resonance transducers. J Pharm Biomed Anal 2001; 24:773-83. [PMID: 11248470 DOI: 10.1016/s0731-7085(00)00545-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High throughput transducers using metal cluster resonance technology are based on surface-enhancement of metal cluster light absorption. These devices can be used for detection of biorecognitive binding, as well as structural changes of nucleic acids, proteins or any other polymer. The optical property for the analytical application of metal cluster films is the so-called anomalous absorption. An absorbing film of clusters positioned 10--400 nm to a mirror surface reacts in a similar way to a reflection filter. At a certain distance of the absorbing layer to the mirror the reflected electromagnetic field has the same phase at the position of the absorbing cluster as the incident fields. This feedback mechanism strongly enhances the effective cluster absorption coefficient. The system is characterised by a narrow reflection minimum whose spectral position shifts sensitively with the interlayer thickness, because a given cluster-mirror distance and wavelength defines the optimum phase. Based on this principle a set of novel tools including biochips and micro arrays is presented, which enabled us to transduce binding, as well as changes of protein-, DNA- and polymer-conformation, quantitatively into an optical signal which can be observed directly as a colour change of a sensor-chip surface.
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Affiliation(s)
- C Mayer
- Kluyver L. for Biotechnology, TU-Delft, Julianalaan 67, 2628BC Delft, The Netherlands
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A self assembled shell of 11-mercaptoundecanoic aminophenylboronic acids on gold nanoclusters. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 1999. [DOI: 10.1016/s0928-4931(99)00023-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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Bingler HG, Brunner H, Leitner A, Aussenegg F, Wokaun A. Interference enhanced surface Raman scattering of adsorbates on a silver-spacer-islands multilayer system. Mol Phys 1995. [DOI: 10.1080/00268979500101321] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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25
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Schalkhammer T, Lobmaier C, Pittner F, Leitner A, Brunner H, Aussenegg FR. Metal island coated polymer sensor for direct determination of the volume effect of chaotropic agents. Mikrochim Acta 1995. [DOI: 10.1007/bf01248255] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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26
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Kümmerlen J, Leitner A, Brunner H, Aussenegg F, Wokaun A. Enhanced dye fluorescence over silver island films: analysis of the distance dependence. Mol Phys 1993. [DOI: 10.1080/00268979300102851] [Citation(s) in RCA: 171] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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27
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Bingler HG, Brunner H, Klenke M, Leitner A, Aussenegg FR, Wokaun A. Enhanced second harmonic generation in a silver–spacer–islands multilayer system. J Chem Phys 1993. [DOI: 10.1063/1.465730] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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28
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Steinm�ller-Nethl D, H�pfel RA, Leitner A, Aussenegg FR, Wokaun A. Enhancement of second-harmonic generation in metal islands close to a conducting surface. ACTA ACUST UNITED AC 1993. [DOI: 10.1007/bf00332600] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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