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Lee S, Sim K, Moon SY, Choi J, Jeon Y, Nam JM, Park SJ. Controlled Assembly of Plasmonic Nanoparticles: From Static to Dynamic Nanostructures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2007668. [PMID: 34021638 DOI: 10.1002/adma.202007668] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/30/2020] [Indexed: 05/20/2023]
Abstract
The spatial arrangement of plasmonic nanoparticles can dramatically affect their interaction with electromagnetic waves, which offers an effective approach to systematically control their optical properties and manifest new phenomena. To this end, significant efforts were made to develop methodologies by which the assembly structure of metal nanoparticles can be controlled with high precision. Herein, recent advances in bottom-up chemical strategies toward the well-controlled assembly of plasmonic nanoparticles, including multicomponent and multifunctional systems are reviewed. Further, it is discussed how the progress in this area has paved the way toward the construction of smart dynamic nanostructures capable of on-demand, reversible structural changes that alter their properties in a predictable and reproducible manner. Finally, this review provides insight into the challenges, future directions, and perspectives in the field of controlled plasmonic assemblies.
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Affiliation(s)
- Sunghee Lee
- Department of Chemistry and Nanoscience, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Korea
| | - Kyunjong Sim
- Department of Chemistry, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - So Yoon Moon
- Department of Chemistry and Nanoscience, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Korea
| | - Jisu Choi
- Department of Chemistry and Nanoscience, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Korea
| | - Yoojung Jeon
- Department of Chemistry and Nanoscience, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Korea
| | - Jwa-Min Nam
- Department of Chemistry, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - So-Jung Park
- Department of Chemistry and Nanoscience, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Korea
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2
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Wrigglesworth EG, Johnston JH. Mie theory and the dichroic effect for spherical gold nanoparticles: an experimental approach. NANOSCALE ADVANCES 2021; 3:3530-3536. [PMID: 36133731 PMCID: PMC9417481 DOI: 10.1039/d1na00148e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Accepted: 05/11/2021] [Indexed: 05/05/2023]
Abstract
The attractive optical properties of metallic nanoparticles include the optically interesting but surprisingly not well understood dichroic effect, defined in this research as when particle colloids display different colours in transmitted and reflected light. Here we use a systematic experimental approach supplemented by theoretical Mie theory analysis to study the origin of this effect. The CloudSpec spectrophotometer has been utilised to produce quantitative scattering and absorption spectra for monodisperse spherical gold nanoparticles, allowing precise links to be made between the optical spectra and the colours observed. The source of the dichroic effect has been conclusively linked to particle size with no special particle shapes or size distributions required. These results experimentally demonstrate the relationship between particle size and the ratio of scattering to absorption predicted by Mie theory, which has important implications for users of Mie theory calculations.
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Affiliation(s)
- Emma G Wrigglesworth
- School of Chemical and Physical Sciences, Victoria University of Wellington Wellington 6140 New Zealand
- NZ Product Accelerator, The University of Auckland Auckland 1142 New Zealand
| | - James H Johnston
- School of Chemical and Physical Sciences, Victoria University of Wellington Wellington 6140 New Zealand
- NZ Product Accelerator, The University of Auckland Auckland 1142 New Zealand
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3
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Elancheliyan R, Dezert R, Castano S, Bentaleb A, Nativ-Roth E, Regev O, Barois P, Baron A, Mondain-Monval O, Ponsinet V. Tailored self-assembled nanocolloidal Huygens scatterers in the visible. NANOSCALE 2020; 12:24177-24187. [PMID: 33283823 DOI: 10.1039/d0nr05788f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Existing nanocolloidal optical resonators exhibiting strong magnetic resonances often suffer from multi-step low yield synthesis methods as well as a limited tunability, particularly in terms of spectral superposition of electric and magnetic resonances, which is the cornerstone for achieving Huygens scatterers. To overcome these drawbacks, we have synthesized clusters of gold nanoparticles using an emulsion-based formulation approach. This fabrication technique involved emulsification of an aqueous suspension of gold nanoparticles in an oil phase, followed by controlled ripening of the emulsion. The structural control of the as synthesized clusters, of mean radius 120 nm and produced in large numbers, is demonstrated with microscopy and X-ray scattering techniques. Using a polarization-resolved multi-angle light scattering setup, we conduct a comprehensive angular and spectroscopic determination of their optical resonant scattering in the visible wavelength range. We thus report on the clear experimental evidence of strong optical magnetic resonances and directional forward scattering patterns. The clusters behave as strong Huygens sources. Our findings crucially show that the electric and magnetic resonances as well as the scattering patterns can be tuned by adjusting the inner cluster structure, modifying a simple parameter of the fabrication method. This experimental approach allows for the large scale production of nanoresonators with potential uses for Huygens metasurfaces.
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Affiliation(s)
- Rajam Elancheliyan
- Univ. Bordeaux, CNRS, Centre de Recherche Paul Pascal, UMR 5031, F-33600 Pessac, France.
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Perspectives of characterization and bioconjugation of gold nanoparticles and their application in lateral flow immunosensing. Drug Deliv Transl Res 2020; 10:878-902. [DOI: 10.1007/s13346-020-00771-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Fadel M, Fadeel DA, Ibrahim M, Hathout RM, El-Kholy AI. One-Step Synthesis of Polypyrrole-Coated Gold Nanoparticles for Use as a Photothermally Active Nano-System. Int J Nanomedicine 2020; 15:2605-2615. [PMID: 32368043 PMCID: PMC7173958 DOI: 10.2147/ijn.s250042] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Accepted: 04/01/2020] [Indexed: 01/09/2023] Open
Abstract
OBJECTIVE This paper introduces a simple one-step and ultra-fast method for synthesis of highly photothermally active polypyrrole-coated gold nanoparticles. The synthesis process is so simple that the reaction is very fast without the need for any additives or complicated steps. METHODOLOGY Polypyrrole-coated gold nanoparticles (AuPpy NPs) were synthesized by reacting chloroauric acid (HAuCl4) with pyrrole (monomer) in aqueous medium at room temperature. These nanoparticles were characterized by UV-visible-NIR spectrometry, transmission electron microscopy (TEM), AC conductivity, zeta sizer and were evaluated for dark cytotoxicity and photocytotoxicity using human hepatocellular carcinoma (HepG2) cell line as a model for cancer cells. RESULTS The synthesized AuPpy NPs showed a peak characteristic for gold nanoparticles (530-600 nm, molar ratio dependent) and a wide absorption band along the visible-NIR region with intensity about triple or even quadruple that of polypyrrole synthesized by the conventional FeCl3 method at the same concentration and under the same conditions. TEM imaging showed that the synthesized AuPpy NPs were composed of spherical or semi-spherical gold core(s) of about 4-10 nm coated with distinct layer(s) of polypyrrole seen either loosely or in clusters. Mean sizes of the synthesized nanoparticles range between ~25 and 220 nm (molar ratio dependent). Zeta potentials of the AuPpy NPs preparations indicate their good colloidal stability. AC conductivity values of AuPpy NPs highly surpass that of Ppy prepared by the conventional FeCl3 method. AuPpy NPs were non-toxic even at high concentrations (up to 1000 µM pyrrole monomer equivalent) under dark conditions. Unlikely, light activated the photothermal activity of AuPpy NPs in a dose-dependent manner. CONCLUSION This method simply and successfully synthesized AuPpy NPs nanoparticles that represent a safe alternative photothermally active multifunctional tool instead of highly toxic and non-biodegradable gold nanorods.
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Affiliation(s)
- Maha Fadel
- Department of Medical Applications of Laser, Pharmaceutical Technology Unit, National Institute of Laser Enhanced Sciences (NILES), Cairo University, Giza, Egypt
| | - Doaa Abdel Fadeel
- Department of Medical Applications of Laser, Pharmaceutical Technology Unit, National Institute of Laser Enhanced Sciences (NILES), Cairo University, Giza, Egypt
| | - Moustafa Ibrahim
- Physics Department, Faculty of Science, Banha University, Banha, Egypt
| | - Rania M Hathout
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
| | - Abdullah I El-Kholy
- Department of Medical Applications of Laser, Pharmaceutical Technology Unit, National Institute of Laser Enhanced Sciences (NILES), Cairo University, Giza, Egypt
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Bertrand M, Devilez A, Hugonin JP, Lalanne P, Vynck K. Global polarizability matrix method for efficient modeling of light scattering by dense ensembles of non-spherical particles in stratified media. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2020; 37:70-83. [PMID: 32118883 DOI: 10.1364/josaa.37.000070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 11/12/2019] [Indexed: 06/10/2023]
Abstract
We introduce a numerical method that enables efficient modeling of light scattering by large, disordered ensembles of non-spherical particles incorporated in stratified media, including when the particles are in close vicinity to each other, to planar interfaces, and/or to localized light sources. The method consists of finding a small set of fictitious polarizable elements-or numerical dipoles-that quantitatively reproduces the field scattered by an individual particle for any excitation and at an arbitrary distance from the particle surface. The set of numerical dipoles is described by a global polarizability matrix that is determined numerically by solving an inverse problem relying on fullwave simulations. The latter are classical and may be performed with any Maxwell's equations solver. Spatial non-locality is an important feature of the numerical dipoles set, providing additional degrees of freedom compared to classical coupled dipoles to reconstruct complex scattered fields. Once the polarizability matrix describing scattering by an individual particle is determined, the multiple scattering problem by ensembles of such particles in stratified media can be solved using a Green tensor formalism and only a few numerical dipoles, thereby with a low physical memory usage, even for dense systems in close vicinity to interfaces. The performance of the method is studied with the example of large high-aspect-ratio high-index dielectric cylinders. The method is easy to implement and may offer new possibilities for the study of complex nanostructured surfaces, which are becoming widespread in emerging photonic technologies.
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Wang P, Huh JH, Lee J, Kim K, Park KJ, Lee S, Ke Y. Magnetic Plasmon Networks Programmed by Molecular Self-Assembly. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1901364. [PMID: 31148269 DOI: 10.1002/adma.201901364] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 04/23/2019] [Indexed: 06/09/2023]
Abstract
Nanoscale manipulation of magnetic fields has been a long-term pursuit in plasmonics and metamaterials, as it can enable a range of appealing optical properties, such as high-sensitivity circular dichroism, directional scattering, and low-refractive-index materials. Inspired by the natural magnetism of aromatic molecules, the cyclic ring cluster of plasmonic nanoparticles (NPs) has been suggested as a promising architecture with induced unnatural magnetism, especially at visible frequencies. However, it remains challenging to assemble plasmonic NPs into complex networks exhibiting strong visible magnetism. Here, a DNA-origami-based strategy is introduced to realize molecular self-assembly of NPs forming complex magnetic architectures, exhibiting emergent properties including anti-ferromagnetism, purely magnetic-based Fano resonances, and magnetic surface plasmon polaritons. The basic building block, a gold NP (AuNP) ring consisting of six AuNP seeds, is arranged on a DNA origami frame with nanometer precision. The subsequent hierarchical assembly of the AuNP rings leads to the formation of higher-order networks of clusters and polymeric chains. Strong emergent plasmonic properties are induced by in situ growth of silver upon the AuNP seeds. This work may facilitate the development of a tunable and scalable DNA-based strategy for the assembly of optical magnetic circuitry, as well as plasmonic metamaterials with high fidelity.
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Affiliation(s)
- Pengfei Wang
- Institute of Molecular Medicine (IMM), Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200127, China
| | - Ji-Hyeok Huh
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
| | - Jaewon Lee
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
| | - Kwangjin Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
| | - Kyung Jin Park
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
| | - Seungwoo Lee
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
- Department of Biomicrosystem Technology, Korea University, Seoul, 02841, Republic of Korea
| | - Yonggang Ke
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, 30322, USA
- Department of Chemistry, Emory University, Atlanta, GA, 30322, USA
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Blanckenberg A, Malgas-Enus R. Raspberry-like gold-decorated silica (SSx–AMPS–Au) nanoparticles for the reductive discoloration of dyes. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-0821-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Kim K, Huh JH, Yu D, Lee S. Fundamental and Practical Limits of Achieving Artificial Magnetism and Effective Optical Medium by Using Self-Assembly of Metallic Colloidal Clusters. Macromol Res 2018. [DOI: 10.1007/s13233-018-6154-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Pham TT, Le LN, Nguyen HN, Luong TTK, Pham TN, Nguyen HL, Nguyen TK. Encapsulating gold nanoparticles in zeolitic imidazolate framework crystal for novel optical response. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.04.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Tunable multiband directional electromagnetic scattering from spoof Mie resonant structure. Sci Rep 2018; 8:8817. [PMID: 29892049 PMCID: PMC5995885 DOI: 10.1038/s41598-018-27268-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 05/30/2018] [Indexed: 11/08/2022] Open
Abstract
We demonstrate that directional electromagnetic scattering can be realized in an artificial Mie resonant structure that supports electric and magnetic dipole modes simultaneously. The directivity of the far-field radiation pattern can be switched by changing wavelength of the incident light as well as tailoring the geometric parameters of the structure. In addition, we further design a quasiperiodic spoof Mie resonant structure by alternately inserting two materials into the slits. The results show that multi-band directional light scattering is realized by exciting multiple electric and magnetic dipole modes with different frequencies in the quasiperiodic structure. The presented design concept is suitable for microwave to terahertz region and can be applied to various advanced optical devices, such as antenna, metamaterial and metasurface.
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Park KJ, Huh JH, Jung DW, Park JS, Choi GH, Lee G, Yoo PJ, Park HG, Yi GR, Lee S. Assembly of "3D" plasmonic clusters by "2D" AFM nanomanipulation of highly uniform and smooth gold nanospheres. Sci Rep 2017; 7:6045. [PMID: 28729629 PMCID: PMC5519739 DOI: 10.1038/s41598-017-06456-w] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 06/12/2017] [Indexed: 11/12/2022] Open
Abstract
Atomic force microscopy (AFM) nanomanipulation has been viewed as a deterministic method for the assembly of plasmonic metamolecules because it enables unprecedented engineering of clusters with exquisite control over particle number and geometry. Nevertheless, the dimensionality of plasmonic metamolecules via AFM nanomanipulation is limited to 2D, so as to restrict the design space of available artificial electromagnetisms. Here, we show that “2D” nanomanipulation of the AFM tip can be used to assemble “3D” plasmonic metamolecules in a versatile and deterministic way by dribbling highly spherical and smooth gold nanospheres (NSs) on a nanohole template rather than on a flat surface. Various 3D plasmonic clusters with controlled symmetry were successfully assembled with nanometer precision; the relevant 3D plasmonic modes (i.e., artificial magnetism and magnetic-based Fano resonance) were fully rationalized by both numerical calculation and dark-field spectroscopy. This templating strategy for advancing AFM nanomanipulation can be generalized to exploit the fundamental understanding of various electromagnetic 3D couplings and can serve as the basis for the design of metamolecules, metafluids, and metamaterials.
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Affiliation(s)
- Kyung Jin Park
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Ji-Hyeok Huh
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Dae-Woong Jung
- School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Jin-Sung Park
- Department of Physics, Korea University, Seoul, 02841, Republic of Korea
| | - Gwan H Choi
- School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Gaehang Lee
- Korea Basic Science Institute (KBSI) and University of Science and Technology, Daejeon, 34113, Republic of Korea
| | - Pil J Yoo
- School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Hong-Gyu Park
- Department of Physics, Korea University, Seoul, 02841, Republic of Korea
| | - Gi-Ra Yi
- School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Seungwoo Lee
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea. .,School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea.
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13
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Patra PP, Chikkaraddy R, Thampi S, Tripathi RPN, Kumar GVP. Large-scale dynamic assembly of metal nanostructures in plasmofluidic field. Faraday Discuss 2016; 186:95-106. [PMID: 26765282 DOI: 10.1039/c5fd00127g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
We discuss two aspects of the plasmofluidic assembly of plasmonic nanostructures at the metal–fluid interface. First, we experimentally show how three and four spot evanescent-wave excitation can lead to unconventional assembly of plasmonic nanoparticles at the metal–fluid interface. We observed that the pattern of assembly was mainly governed by the plasmon interference pattern at the metal–fluid interface, and further led to interesting dynamic effects within the assembly. The interference patterns were corroborated by 3D finite-difference time-domain simulations. Secondly, we show how anisotropic geometry, such as Ag nanowires, can be assembled and aligned in unstructured and structured plasmofluidic fields. We found that by structuring the metal-film, Ag nanowires can be aligned at the metal–fluid interface with a single evanescent-wave excitation, thus highlighting the prospect of assembling plasmonic circuits in a fluid. An interesting aspect of our method is that we obtain the assembly at locations away from the excitation points, thus leading to remote assembly of nanostructures. The results discussed herein may have implications in realizing a platform for reconfigurable plasmonic metamaterials, and a test-bed to understand the effect of plasmon interference on assembly of nanostructures in fluids.
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Affiliation(s)
- Partha Pratim Patra
- Photonics & Optical Nanoscopy Laboratory
- Division of Physics and Center for Energy Science
- Indian Institute of Science Education and Research
- Pune-411008
- India
| | - Rohit Chikkaraddy
- Photonics & Optical Nanoscopy Laboratory
- Division of Physics and Center for Energy Science
- Indian Institute of Science Education and Research
- Pune-411008
- India
| | - Sreeja Thampi
- Photonics & Optical Nanoscopy Laboratory
- Division of Physics and Center for Energy Science
- Indian Institute of Science Education and Research
- Pune-411008
- India
| | - Ravi P. N. Tripathi
- Photonics & Optical Nanoscopy Laboratory
- Division of Physics and Center for Energy Science
- Indian Institute of Science Education and Research
- Pune-411008
- India
| | - G. V. Pavan Kumar
- Photonics & Optical Nanoscopy Laboratory
- Division of Physics and Center for Energy Science
- Indian Institute of Science Education and Research
- Pune-411008
- India
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14
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Imaging Nanoscale Electromagnetic Near-Field Distributions Using Optical Forces. Sci Rep 2015; 5:10610. [PMID: 26073331 PMCID: PMC5155520 DOI: 10.1038/srep10610] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Accepted: 04/21/2015] [Indexed: 11/28/2022] Open
Abstract
We demonstrate the application of Atomic Force Microscopy (AFM) for mapping optical near-fields with nanometer resolution, limited only by the AFM probe geometry. By detecting the optical force between a gold coated AFM probe and its image dipole on a glass substrate, we profile the electric field distributions of tightly focused laser beams with different polarizations. The experimentally recorded focal force maps agree well with theoretical predictions based on a dipole-dipole interaction model. We experimentally estimate the aspect ratio of the apex of gold coated AFM probe using only optical forces. We also show that the optical force between a sharp gold coated AFM probe and a spherical gold nanoparticle of radius 15 nm, is indicative of the electric field distribution between the two interacting particles. Photo Induced Force Microscopy (PIFM) allows for background free, thermal noise limited mechanical imaging of optical phenomenon over wide range of wavelengths from Visible to RF with detection sensitivity limited only by AFM performance.
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Qian Z, Hastings SP, Li C, Edward B, McGinn CK, Engheta N, Fakhraai Z, Park SJ. Raspberry-like metamolecules exhibiting strong magnetic resonances. ACS NANO 2015; 9:1263-1270. [PMID: 25621502 DOI: 10.1021/nn5050678] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We report a synthetic approach to produce raspberry-like plasmonic nanostructures with unusually strong magnetic resonances, termed raspberry-like metamolecules (raspberry-MMs). The synthesis based on the surfactant-assisted templated seed-growth method allows for the simultaneous one-step synthesis and assembly of well-insulated gold nanoparticles. The aromatic surfactant used for the syntheses forms a thin protective layer around the nanoparticles, preventing them from touching each other and making it possible to pack discrete nanoparticles at close distances in a single cluster. The resulting isotropic gold nanoparticle clusters (i.e., raspberry-MMs) exhibit unusually broad extinction spectra in the visible and near-IR region. Finite-difference time-domain (FDTD) modeling showed that the raspberry-MMs support strong magnetic resonances that contribute significantly to the broadband spectra. The strong magnetic scattering was also verified by far-field scattering measurements, which show that in the near-IR region the magnetic dipole resonance can be even stronger than the electric dipole resonance in these raspberry-MMs. Structural parameters such as the size and the number of gold nanoparticles composing raspberry-MMs can be readily tuned in our synthetic method. A series of syntheses with varying structure parameters, along with FDTD modeling and mode analyses of corresponding model structures, showed that the close packing of a large number of metal nanoparticles in raspberry-MMs is responsible for the unusually strong magnetic resonances observed here.
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Affiliation(s)
- Zhaoxia Qian
- Department of Chemistry, ‡Department of Physics, and §Department of Electrical and Systems Engineering, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
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16
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Kim DK, Hwang YJ, Yoon C, Yoon HO, Chang KS, Lee G, Lee S, Yi GR. Experimental approach to the fundamental limit of the extinction coefficients of ultra-smooth and highly spherical gold nanoparticles. Phys Chem Chem Phys 2015. [DOI: 10.1039/c5cp02968f] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The extinction coefficients of ultra-smooth Au nanospheres were obtained, which were higher than those of faceted AuNPs and were found to approach the theoretical limits.
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Affiliation(s)
- Dong-Kwan Kim
- School of Chemical Engineering
- Sungkyunkwan University (SKKU)
- Suwon 440-746
- Republic of Korea
| | - Yoon Jo Hwang
- SKKU Advanced Institute of Nanotechnology (SAINT)
- Sungkyunkwan University (SKKU)
- Suwon 440-746
- Republic of Korea
| | - Cheolho Yoon
- Korea Basic Science Institute (KBSI)
- Daejeon 305-806
- Republic of Korea
| | - Hye-On Yoon
- Korea Basic Science Institute (KBSI)
- Daejeon 305-806
- Republic of Korea
| | - Ki Soo Chang
- Korea Basic Science Institute (KBSI)
- Daejeon 305-806
- Republic of Korea
| | - Gaehang Lee
- Korea Basic Science Institute (KBSI)
- Daejeon 305-806
- Republic of Korea
- University of Science and Technology
- Daejeon
| | - Seungwoo Lee
- School of Chemical Engineering
- Sungkyunkwan University (SKKU)
- Suwon 440-746
- Republic of Korea
- SKKU Advanced Institute of Nanotechnology (SAINT)
| | - Gi-Ra Yi
- School of Chemical Engineering
- Sungkyunkwan University (SKKU)
- Suwon 440-746
- Republic of Korea
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Yin Q, Han X, Ponsinet V, Liu H. Controlled assembly of plasmonic nanoparticles using neutral-charged diblock copolymers. J Colloid Interface Sci 2014; 431:97-104. [DOI: 10.1016/j.jcis.2014.05.047] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 05/18/2014] [Accepted: 05/22/2014] [Indexed: 10/25/2022]
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18
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Townsend S, Zhou S, Li Q. Multiscale metamaterials: a new route to isotropic double-negative behaviour at visible frequencies. OPTICS EXPRESS 2014; 22:21929-21937. [PMID: 25321568 DOI: 10.1364/oe.22.021929] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We propose a systematic method of producing isotropic, double-negative metamaterials which operate in the visible spectrum. The material comprises two sets of inclusions dispersed in a host medium. We demonstrate that if the inclusions in one set are much smaller than those in the other, then the larger will behave as though they are submerged in a composite background material, rather than the true host material. This hierarchy effect is shown to enrich the designer's capacity to induce strong, simultaneous electric and magnetic resonance at an arbitrary visible frequency, leading to double-negative behaviour. The predictions of Mie theory are verified using full-wave analysis and backward waves directly measured in the proposed designs.
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Burgin J, Si S, Delville MH, Delville JP. Enhancing optofluidic actuation of micro-objects by tagging with plasmonic nanoparticles. OPTICS EXPRESS 2014; 22:10139-10150. [PMID: 24921718 DOI: 10.1364/oe.22.010139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report experimentally and theoretically on the significant exaltation of optical forces on microparticles when they are partially coated by metallic nanodots and shined with laser light within the surface plasmon resonance. Optical forces on both pure silica particles and silica-gold raspberries are characterized using an optical chromatography setup to measure the variations of the Stokes drag versus laser beam power. Results are compared to the Mie theory prediction for both pure dielectric particles and core-shell ones with a shell described as a continuous dielectric-metal composite of dielectric constant determined from the Maxwell-Garnett approach. The observed quantitative agreement demonstrates that radiation pressure forces are directly related to the metal concentration on the microparticle surface and that metallic nanodots increase the magnitude of optical forces compared to pure dielectric particles of the same overall size, even at very low metal concentration. Behaving as "micro-sized nanoparticles", the benefit of microparticles coated with metallic nanodots is thus twofold: it significantly enhances optofluidic manipulation and motion at the microscale, and brings nanometric optical, chemical or biological capabilities to the microscale.
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Malassis L, Massé P, Tréguer-Delapierre M, Mornet S, Weisbecker P, Kravets V, Grigorenko A, Barois P. Bottom-up fabrication and optical characterization of dense films of meta-atoms made of core-shell plasmonic nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:1551-1561. [PMID: 23286375 DOI: 10.1021/la303150r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In an attempt to fabricate low index metamaterials by a bottom-up approach, meta-atoms constituted of silica-coated silver nanoparticles are assembled by a Langmuir-Schaefer technique into thin films of large area and well-controlled thickness. The silica shells ensure a constant distance between the silver cores, hence providing a constant coupling of the localized surface plasmon resonance (LSPR) of the nanoparticles in the assembled composite material. The optical response is studied by normal angle spectral reflectance measurements and by variable angle spectroscopic ellipsometry. The normal incidence data are described well in the framework of a single effective Lorentz oscillator model. The resonance of the assembled material is blue-shifted and shows no significant broadening with respect to the absorption band of the individual nanoparticles. The observation of these two effects is enabled by the core-shell structure of the meta-atoms that prevents aggregation of the metallic cores. The ellipsometry study confirms the general behavior and reveals the natural birefringence of the few-layer materials. The amplitude of the observed resonance is weaker than expected from the Maxwell-Garnett mixing rule. This well-characterized system may constitute a good model for numerical simulations.
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Cunningham A, Bürgi T. Bottom-up Organisation of Metallic Nanoparticles. AMORPHOUS NANOPHOTONICS 2013. [DOI: 10.1007/978-3-642-32475-8_1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Fan JA, Bao K, Sun L, Bao J, Manoharan VN, Nordlander P, Capasso F. Plasmonic mode engineering with templated self-assembled nanoclusters. NANO LETTERS 2012; 12:5318-5324. [PMID: 22947109 DOI: 10.1021/nl302650t] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Plasmonic nanoparticle assemblies are a materials platform in which optical modes, resonant frequencies, and near-field intensities can be specified by the number and position of nanoparticles in a cluster. A current challenge is to achieve clusters with higher yields and new types of shapes. In this Letter, we show that a broad range of plasmonic nanoshell nanoclusters can be assembled onto a lithographically defined elastomeric substrate with relatively high yields using templated assembly. We assemble and measure the optical properties of three cluster types: Fano-resonant heptamers, linear chains, and rings of nanoparticles. The yield of heptamer clusters is measured to be over 30%. The assembly of plasmonic nanoclusters on an elastomer paves the way for new classes of plasmonic nanocircuits and colloidal metamaterials that can be transfer-printed onto various substrate media.
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Affiliation(s)
- Jonathan A Fan
- Beckman Institute, University of Illinois, 405 North Mathews Avenue, Urbana, Illinois 61801, USA
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Singh ND, Moocarme M, Edelstein B, Punnoose N, Vuong LT. Anomalously-large photo-induced magnetic response of metallic nanocolloids in aqueous solution using a solar simulator. OPTICS EXPRESS 2012; 20:19214-19225. [PMID: 23038563 DOI: 10.1364/oe.20.019214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We experimentally, analytically, and numerically demonstrate the nonlinear photo-induced plasmon-assisted magnetic response that occurs with metallic nanoparticles in aqueous solution. We measure the scattered spectra from solutions of gold nanospheres (10(-7) fill factor) and observe appreciable changes when simultaneously applying DC magnetic fields and illuminating samples with light. The magnetic response is achieved using light from a solar simulator at unprecedented low illumination intensities (< 1W/cm(2)) and is sustained when the magnetic field is removed. Distinctly different behavior is observed depending on the circular-polarization handedness given a fixed magnetic field. Nanoparticle aggregation is more likely to occur when the circular-polarization trajectory opposes the solenoid current that produces the magnetic field. Using Mie's theoretical solution, we show how vortex orbital surface currents lead to an increased and anisotropic electrical conductivity, which shifts the scattered spectra in agreement with experimental results. The single-nanoparticle plasmon-induced magnetization, which couples the scattered and incident electric fields, changes sign with orthogonal circular-polarization handedness.
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Affiliation(s)
- N D Singh
- Physics Department, City University of New York, Queens College and the Graduate Center, Flushing, NY, USA
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Mühlig S, Cunningham A, Scheeler S, Pacholski C, Bürgi T, Rockstuhl C, Lederer F. Self-assembled plasmonic core-shell clusters with an isotropic magnetic dipole response in the visible range. ACS NANO 2011; 5:6586-6592. [PMID: 21714523 DOI: 10.1021/nn201969h] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We theoretically analyze, fabricate, and characterize a three-dimensional plasmonic nanostructure that exhibits a strong and isotropic magnetic response in the visible spectral domain. Using two different bottom-up approaches that rely on self-organization and colloidal nanochemistry, we fabricate clusters consisting of dielectric core spheres, which are smaller than the wavelength of the incident radiation and are decorated by a large number of metallic nanospheres. Hence, despite having a complicated inner geometry, such a core-shell particle is sufficiently small to be perceived as an individual object in the far field. The optical properties of such complex plasmonic core-shell particles are discussed for two different core diameters.
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Affiliation(s)
- Stefan Mühlig
- Institute of Condensed Matter Theory and Solid State Optics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany.
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