1351
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Fattori N, Maroneze CM, da Costa LP, Strauss M, Sigoli FA, Mazali IO, Gushikem Y. Ion-exchange properties of imidazolium-grafted SBA-15 toward AuCl4(-) anions and their conversion into supported gold nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:10281-10288. [PMID: 22697479 DOI: 10.1021/la301374z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Imidazolium groups were successfully prepared and grafted on the surface of SBA-15 mesoporous silica. The ion-exchange properties of the functionalized porous solid (SBA-15/R(+)Cl(-)) toward AuCl(4)(-) anions were evaluated through an ion-exchange isotherm. The calculated values of the equilibrium constant (log β = 4.47) and the effective ion-exchange capacity (t(Q) = 0.79 mmol g(-1)) indicate that the AuCl(4)(-) species can be loaded and strongly retained on the functionalized surface as counterions of the imidazolium groups. Subsequently, solids containing different amounts of AuCl(4)(-) ions were submitted to a chemical reduction process with NaBH(4), converting the anionic gold species into supported gold nanoparticles. The plasmon resonance bands, the X-ray diffraction patterns, and transmission electron microscopy images of the supported gold nanoparticles before and after thermal treatment at 973 K indicate that the metal nanostructures are highly dispersed and stabilized by the host environment.
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Affiliation(s)
- Natalia Fattori
- Institute of Chemistry, University of Campinas (UNICAMP), Campinas, São Paulo (SP), Brazil
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1352
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Live LS, Dhawan A, Gibson KF, Poirier-Richard HP, Graham D, Canva M, Vo-Dinh T, Masson JF. Angle-dependent resonance of localized and propagating surface plasmons in microhole arrays for enhanced biosensing. Anal Bioanal Chem 2012; 404:2859-68. [DOI: 10.1007/s00216-012-6195-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Revised: 05/29/2012] [Accepted: 06/13/2012] [Indexed: 10/28/2022]
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1353
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Nepal D, Onses MS, Park K, Jespersen M, Thode CJ, Nealey PF, Vaia RA. Control over position, orientation, and spacing of arrays of gold nanorods using chemically nanopatterned surfaces and tailored particle-particle-surface interactions. ACS NANO 2012; 6:5693-5701. [PMID: 22647144 DOI: 10.1021/nn301824u] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The synergy of self- and directed-assembly processes and lithography provides intriguing avenues to fabricate translationally ordered nanoparticle arrangements, but currently lacks the robustness necessary to deliver complex spatial organization. Here, we demonstrate that interparticle spacing and local orientation of gold nanorods (AuNR) can be tuned by controlling the Debye length of AuNR in solution and the dimensions of a chemical contrast pattern. Electrostatic and hydrophobic selectivity for AuNR to absorb to patterned regions of poly(2-vinylpyridine) (P2VP) and polystyrene brushes and mats was demonstrated for AuNR functionalized with mercaptopropane sulfonate (MS) and poly(ethylene glycol), respectively. For P2VP patterns of stripes with widths comparable to the length of the AuNR, single- and double-column arrangements of AuNR oriented parallel and perpendicular to the P2VP line were obtained for MS-AuNR. Furthermore, the spacing of the assembled AuNR was uniform along the stripe and related to the ionic strength of the AuNR dispersion. The different AuNR arrangements are consistent with predictions based on maximization of packing of AuNR within the confined strip.
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Affiliation(s)
- Dhriti Nepal
- Nanostructured and Biological Materials Branch, Air Force Research Laboratories/RXBN, Wright-Patterson AFB, Ohio, USA
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1354
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Grzelczak M, Mezzasalma SA, Ni W, Herasimenka Y, Feruglio L, Montini T, Pérez-Juste J, Fornasiero P, Prato M, Liz-Marzán LM. Antibonding plasmon modes in colloidal gold nanorod clusters. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8826-8833. [PMID: 22044275 DOI: 10.1021/la203750d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The optical response of nanoplasmonic colloids in disperse phase is strictly related to their shape. However, upon self-assembly, new optical features, for example, bonding or antibonding modes, emerge as a result of the mutual orientations of nanoparticles. The geometry of the final assemblies often determines which mode is dominating in the overall optical response. These new plasmon modes, however, are mostly observed in silico, as self-assembly in the liquid phase leads to cluster formation with a broad range of particle units. Here we show that low-symmetry clustering of gold nanorods (AuNRs) in solution can also reveal antibonding modes. We found that UV-light irradiation of colloidal dispersions of AuNRs in N-methyl-2-pyrrolidone (NMP), stabilized by poly(vinylpyrrolidone) (PVP) results in the creation of AuNRs clusters with ladderlike morphology, where antibonding modes can be identified. We propose that UV irradiation induces formation of radicals in solvent molecules, which then promote cross-linking of PVP chains on the surface of adjacent particles. This picture opens up a number of relevant questions in nanoscience and is expected to find application in light induced self-assembly of particles with various compositions and morphologies.
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Affiliation(s)
- Marek Grzelczak
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, P.le Europa 1, 34127 Trieste Italy.
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1355
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Schulz KM, Abb S, Fernandes R, Abb M, Kanaras AG, Muskens OL. Formation and plasmonic response of self-assembled layers of colloidal gold nanorods and branched gold nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8874-8880. [PMID: 22401603 DOI: 10.1021/la300199j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The plasmonic properties of self-assembled layers of rod- and branched-shaped gold nanoparticles were investigated using optical techniques. Nanoparticles were synthesized by a surfactant-guided, seed-mediated growth method. The layers were obtained by gradual assembly of nanoparticles at the interface between a polar and a nonpolar solvent and were transferred to a glass slide. Polarization and angle-dependent extinction measurements showed that the layers made of gold nanorods were governed by an effective medium response. The response of the layers made by branched gold particles was characterized by random light scattering. Microscopic mapping of the spatial mode structure demonstrates a uniform optical response of the nanoparticle layers down to a submicrometer length scale.
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Affiliation(s)
- K Marvin Schulz
- SEPnet and Physics and Astronomy, Faculty of Applied and Physical Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
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1356
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Warren SC, Walker DA, Grzybowski BA. Plasmoelectronics: coupling plasmonic excitation with electron flow. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:9093-9102. [PMID: 22385329 DOI: 10.1021/la300377j] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Explorations of the coupling of light and charge via localized surface plasmons have led to the discovery that plasmonic excitation can influence macroscopic flows of charge and, conversely, that charging events can change the plasmonic excitation. We discuss recent theory and experiments in the emerging field of plasmoelectronics, with particular emphasis on the application of these materials to challenges in nanotechnology, energy use, and sensing.
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Affiliation(s)
- Scott C Warren
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
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1357
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Talebi N, Sigle W, Vogelgesang R, Koch CT, Fernández-López C, Liz-Marzán LM, Ögüt B, Rohm M, van Aken PA. Breaking the mode degeneracy of surface plasmon resonances in a triangular system. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8867-73. [PMID: 22440151 DOI: 10.1021/la3001762] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
In this paper, we present a systematic investigation of symmetry-breaking in the plasmonic modes of triangular gold nanoprisms. Their geometrical C(3v) symmetry is one of the simplest possible that allows degeneracy in the particle's mode spectrum. It is reduced to the nondegenerate symmetries C(v) or E by positioning additional, smaller gold nanoprisms in close proximity, either in a lateral or a vertical configuration. Corresponding to the lower symmetry of the system, its eigenmodes also feature lower symmetries (C(v)), or preserve only the identity (E) as symmetry. We discuss how breaking the symmetry of the plasmonic system not only breaks the degeneracy of some lower order modes, but also how it alters the damping and eigenenergies of the observed Fano-type resonances.
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Affiliation(s)
- Nahid Talebi
- Max Planck Institute for Intelligent Systems, Heisenbergstraße 3, D-70569 Stuttgart, Germany.
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1358
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Park G, Lee C, Seo D, Song H. Full-color tuning of surface plasmon resonance by compositional variation of Au@Ag core-shell nanocubes with sulfides. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:9003-9. [PMID: 22304325 DOI: 10.1021/la300154x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In the present study, we demonstrate the precise tuning of surface plasmon resonance over the full visible range by compositional variation of the nanoparticles. The addition of sulfide ions into the Au@Ag core-shell nanocubes generates stable Au@Ag/Ag(2)S core-shell nanoparticles at room temperature, and the plasmon extinction maximum shifts to the longer wavelength covering the entire visible range of 500-750 nm. Based on the optical property, the Au@Ag core-shell nanocubes are employed as a colorimetric sensing framework for sulfide detection in water. The detection limit is measured to be 10 ppb by UV-vis spectroscopy and 200 ppb by naked eyes. Such nanoparticles would be useful for decoration and sensing purposes, due to their precise color tunability and high stability.
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Affiliation(s)
- Garam Park
- Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
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1359
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Lange H, Juárez BH, Carl A, Richter M, Bastús NG, Weller H, Thomsen C, von Klitzing R, Knorr A. Tunable plasmon coupling in distance-controlled gold nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8862-6. [PMID: 22416809 DOI: 10.1021/la3001575] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Plasmons are resonant excitations in metallic films and nanoparticles. For small enough static distances of metal nanoparticles, additional plasmon-coupled modes appear as a collective excitation between the nanoparticles. Here we show, by combining poly(N-isopropylacrylamide) micro- and nanospheres and Au nanoparticles, how to design a system that allows controllably and reversibly switching on and off, and tuning the plasmon-coupled mode.
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Affiliation(s)
- Holger Lange
- Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr. 36, 10623, Berlin, Germany.
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1360
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Gwo S, Lin MH, He CL, Chen HY, Teranishi T. Bottom-up assembly of colloidal gold and silver nanostructures for designable plasmonic structures and metamaterials. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8902-8908. [PMID: 22372768 DOI: 10.1021/la300226r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report on bottom-up assembly routes for fabricating plasmonic structures and metamaterials composed of colloidal gold and silver nanostructures, such as nanoparticles ("metatoms") and shape-controlled nanocrystals. Owing to their well-controlled sizes/shapes, facile surface functionalization, and excellent plasmonic properties in the visible and near-infrared regions, these nanoparticles and nanocrystals are excellent building blocks of plasmonic structures and metamaterials for optical applications. Recently, we have utilized two kinds of bottom-up techniques (i.e., multiple-probe-based nanomanipulation and layer-by-layer self-assembly) to fabricate strongly coupled plasmonic dimers, one-dimensional (1D) chains, and large-scale two-dimensional/three-dimensional (2D/3D) nanoparticle supercrystals. These coupled nanoparticle/nanocrystal assemblies exhibit unique and tunable plasmonic properties, depending on the material composition, size/shape, intergap distance, the number of composing nanoparticles/nanocrystals (1D chains), and the nanoparticle layer number in the case of 3D nanoparticle supercrystals. By studying these coupled nanoparticle/nanocrystal assemblies, the fundamental plasmonic metamaterial effects could be investigated in detail under well-prepared and previously unexplored experimental settings.
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Affiliation(s)
- Shangjr Gwo
- Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan.
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1361
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Paul A, Kenens B, Hofkens J, Uji-i H. Excitation polarization sensitivity of plasmon-mediated silver nanotriangle growth on a surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8920-8925. [PMID: 22444030 DOI: 10.1021/la300533h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this contribution, we report an effective and relatively simple route to grow triangular flat-top silver nanoparticles (NPs) directly on a solid substrate from smaller NPs through a wet photochemical synthesis. The method consists of fixing small, preformed nanotriangles (NTs) on a substrate and subsequently irradiating them with light in a silver seed solution. Furthermore, the use of linearly polarized light allows for exerting control on the growth direction of the silver nanotriangles on the substrate. Evidence for the role of surface plasmon resonances in governing the growth of the NTs is obtained by employing linear polarized light. Thus, this study demonstrates that light-induced, directional synthesis of nanoparticles on solid substrates is in reach, which is of utmost importance for plasmonic applications.
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Affiliation(s)
- Aniruddha Paul
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F 3001 Heverlee, Belgium
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1362
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Tachikawa T, Majima T. Single-molecule, single-particle approaches for exploring the structure and kinetics of nanocatalysts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8933-8943. [PMID: 22324887 DOI: 10.1021/la300177h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this Article, we focus on the in situ observation of photochemical reactions on individual nanoobjects of solid catalysts using single-molecule, single-particle fluorescence spectroscopy. The use of high-resolution imaging techniques with suitable fluorogenic probes enables us to determine the location of the catalytically active sites that are related to the structural heterogeneities on the surface of the solid catalyst and the temporal fluctuation of photochemical reactivity. Furthermore, we present the real-time observation of metastable gold nanoclusters in polymer matrices at the single-cluster level. This Article encourages readers to explore the nanoworld in terms of practical applications in many fields such as fundamental physics and chemistry.
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Affiliation(s)
- Takashi Tachikawa
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
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1363
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Wang J, Yu X, Boriskina SV, Reinhard BM. Quantification of differential ErbB1 and ErbB2 cell surface expression and spatial nanoclustering through plasmon coupling. NANO LETTERS 2012; 12:3231-7. [PMID: 22587495 PMCID: PMC3427031 DOI: 10.1021/nl3012227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Cell surface receptors play ubiquitous roles in cell signaling and communication and their expression levels are important biomarkers for many diseases. Expression levels are, however, only one factor that determines the physiological activity of a receptor. For some surface receptors, their distribution on the cell surface, especially their clustering, provides additional mechanisms for regulation. To access this spatial information robust assays are required that provide detailed insight into the organization of cell surface receptors on nanometer length scales. In this manuscript, we demonstrate through combination of scattering spectroscopy, electron microscopy, and generalized multiple particle Mie theory (GMT) simulations that the density- and morphology-dependent spectral response of Au nanoparticle (NP) immunolabels bound to the epidermal growth factor receptors ErbB1 and ErbB2 encodes quantitative information of both the cell surface expression and spatial clustering of the two receptors in different unliganded in vitro cancer cell lines (SKBR3, MCF7, A431). A systematic characterization of the collective spectral responses of NPs targeted at ErbB1 and ErbB2 at various NP concentrations indicates differences in the large-scale organization of ErbB1 and ErbB2 in cell lines that overexpress these receptors. Validation experiments in the scanning electron microscope (SEM) confirm that NPs targeted at ErbB1 on A431 are more strongly clustered than NPs bound to ErbB2 on SKBR3 or MCF7 at overall comparable NP surface densities. This finding is consistent with the existence of larger receptor clusters for ErbB1 than for ErbB2 in the plasma membranes of the respective cells.
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Affiliation(s)
- Jing Wang
- Department of Chemistry and The Photonics Center, Boston University, Boston, MA 02215
| | - Xinwei Yu
- Department of Chemistry and The Photonics Center, Boston University, Boston, MA 02215
| | - Svetlana V. Boriskina
- Department of Chemistry and The Photonics Center, Boston University, Boston, MA 02215
| | - Björn M. Reinhard
- Department of Chemistry and The Photonics Center, Boston University, Boston, MA 02215
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1364
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Wiener A, Fernández-Domínguez AI, Horsfield AP, Pendry JB, Maier SA. Nonlocal effects in the nanofocusing performance of plasmonic tips. NANO LETTERS 2012; 12:3308-3314. [PMID: 22616689 DOI: 10.1021/nl301478n] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The nanofocusing performance of plasmonic tips is studied analytically and numerically. The effects of electron-electron interactions in the dielectric response of the metal are taken into account through the implementation of a nonlocal, spatially dispersive, hydrodynamic permittivity. We demonstrate that spatial dispersion only slightly modifies the device parameters which maximize its field enhancement capabilities. The interplay between nonlocality, tip bluntness, and surface roughness is explored. We show that, although spatial dispersion reduces the field enhancement taking place at the structure apex, it also diminishes the impact that geometric imperfections have on its performance.
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Affiliation(s)
- Aeneas Wiener
- Department of Physics, Imperial College London, London SW7 2AZ
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1365
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Zhang X, Ma Z, Luo R, Gu Y, Meng C, Wu X, Gong Q, Tong L. Single-nanowire surface plasmon gratings. NANOTECHNOLOGY 2012; 23:225202. [PMID: 22571946 DOI: 10.1088/0957-4484/23/22/225202] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We demonstrate single-nanowire plasmonic gratings made by focused-ion-beam milling of single Au nanowires. At the optical communication band, a 290 nm diameter Au nanowire with grating length of 15.6 µm offers evident grating features with a transmission dip up to ∼3.3 dB. The grating effects in typical Au nanowires with different grating parameters (e.g. grating depth, width and length) are also investigated. Our results suggest a novel approach to one-dimensional plasmonic gratings with high compactness and flexibility, which may find applications in low-dimensional wavelength-selective plasmonic circuits and devices.
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Affiliation(s)
- Xining Zhang
- State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
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1366
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Shanthil M, Thomas R, Swathi RS, George Thomas K. Ag@SiO2 Core-Shell Nanostructures: Distance-Dependent Plasmon Coupling and SERS Investigation. J Phys Chem Lett 2012; 3:1459-64. [PMID: 26285622 DOI: 10.1021/jz3004014] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Enhancement of Raman signals of pyrene due to the enhanced electric fields on the surface of silver nanoparticles has been investigated by controlling the thickness of the silica shell. Dimeric nanostructures having well-defined gaps between two silver nanoparticles were prepared, and the gap size (d) was varied from 1.5 to 40 nm. The molecules trapped at the dimeric junctions showed higher Raman signal enhancements when the gap was less than 15 nm due to the presence of amplified electric field, in agreement with our theoretical studies. The experimental Raman enhancement factors at the hot spots follow a 1/d(n) dependence, with n = 1.5, in agreement with the recent theoretical studies by Schatz and co-workers. Experimental results presented here on the distance dependence of surface enhanced Raman spectroscopy (SERS) enhancement at the hot spots can provide insight on the design of newer plasmonic nanostructures with optimal nanogaps.
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Affiliation(s)
- M Shanthil
- †Photosciences and Photonics Group, National Institute for Interdisciplinary Science and Technology (NIIST), CSIR, Thiruvananthapuram, 695 019, India
| | - Reshmi Thomas
- ‡School of Chemistry, Indian Institute of Science Education and Research-Thiruvananthapuram (IISER-TVM), CET Campus, Thiruvananthapuram, 695 016, India
| | - R S Swathi
- ‡School of Chemistry, Indian Institute of Science Education and Research-Thiruvananthapuram (IISER-TVM), CET Campus, Thiruvananthapuram, 695 016, India
| | - K George Thomas
- †Photosciences and Photonics Group, National Institute for Interdisciplinary Science and Technology (NIIST), CSIR, Thiruvananthapuram, 695 019, India
- ‡School of Chemistry, Indian Institute of Science Education and Research-Thiruvananthapuram (IISER-TVM), CET Campus, Thiruvananthapuram, 695 016, India
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1367
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Park CG, Kim JY, Lee EB, Choi HK, Park WH, Kim JW, Kim ZH. Tip-Enhanced Raman Scattering with a Nanoparticle-Functionalized Probe. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.5.1748] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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1368
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Ashkarran AA, Ghavami M, Aghaverdi H, Stroeve P, Mahmoudi M. Bacterial Effects and Protein Corona Evaluations: Crucial Ignored Factors in the Prediction of Bio-Efficacy of Various Forms of Silver Nanoparticles. Chem Res Toxicol 2012; 25:1231-42. [DOI: 10.1021/tx300083s] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Ali Akbar Ashkarran
- Plasma Physics Research
Center,
Science and Research Branch, Islamic Azad University, P.O. Box 14665-678, Tehran, Iran
| | - Mahdi Ghavami
- Laboratory of NanoBio-Interactions
(www.biospion.com), Department of Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences,
Tehran, Iran
| | - Hossein Aghaverdi
- Laboratory of NanoBio-Interactions
(www.biospion.com), Department of Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences,
Tehran, Iran
| | - Pieter Stroeve
- Department of
Chemical Engineering
and Materials Science, University of California, Davis, California 95616, United States
| | - Morteza Mahmoudi
- Laboratory of NanoBio-Interactions
(www.biospion.com), Department of Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences,
Tehran, Iran
- Nanotechnology Research Center,
Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
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1369
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Krpetić Ž, Singh I, Su W, Guerrini L, Faulds K, Burley GA, Graham D. Directed Assembly of DNA-Functionalized Gold Nanoparticles Using Pyrrole–Imidazole Polyamides. J Am Chem Soc 2012; 134:8356-9. [DOI: 10.1021/ja3014924] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Željka Krpetić
- Centre for Molecular Nanometrology,
WestCHEM, Department of Pure and Applied Chemistry, The University of Strathclyde, 295 Cathedral Street, Glasgow
G1 1XL, United Kingdom
| | - Ishwar Singh
- Department of Pure and Applied
Chemistry, WestCHEM, The University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Wu Su
- Department of Chemistry, The University of Leicester, University Road, Leicester
LE1 7RH, United Kingdom
| | - Luca Guerrini
- Centre for Molecular Nanometrology,
WestCHEM, Department of Pure and Applied Chemistry, The University of Strathclyde, 295 Cathedral Street, Glasgow
G1 1XL, United Kingdom
| | - Karen Faulds
- Centre for Molecular Nanometrology,
WestCHEM, Department of Pure and Applied Chemistry, The University of Strathclyde, 295 Cathedral Street, Glasgow
G1 1XL, United Kingdom
| | - Glenn A. Burley
- Department of Pure and Applied
Chemistry, WestCHEM, The University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Duncan Graham
- Centre for Molecular Nanometrology,
WestCHEM, Department of Pure and Applied Chemistry, The University of Strathclyde, 295 Cathedral Street, Glasgow
G1 1XL, United Kingdom
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1370
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Hentschel M, Schäferling M, Weiss T, Liu N, Giessen H. Three-dimensional chiral plasmonic oligomers. NANO LETTERS 2012; 12:2542-7. [PMID: 22458608 DOI: 10.1021/nl300769x] [Citation(s) in RCA: 166] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The living world is chiral. Chirality or the handedness of a structure or molecule is at the heart of life itself. Recently, it has been shown that plasmonic structures exhibit unprecedented and gigantic chiral optical responses. Here we show that truly three-dimensional arrangements of plasmonic "meta-atoms" only exhibit a chiral optical response if similar plasmonic "atoms" are arranged in a handed fashion as we require resonant plasmonic coupling. Moreover, we demonstrate that such particle groupings, similarly to molecular systems, possess the capability to encode their three-dimensional arrangement in unique and well-modulated spectra making them ideal candidates for a three-dimensional chiral plasmon ruler. Our results are crucial for the future design and improvement of plasmonic chiral optical systems, for example, for ultrasensitive enantiomer sensing on the single molecule level.
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Affiliation(s)
- Mario Hentschel
- 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, D-70569 Stuttgart, Germany.
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1371
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Gandra N, Abbas A, Tian L, Singamaneni S. Plasmonic planet-satellite analogues: hierarchical self-assembly of gold nanostructures. NANO LETTERS 2012; 12:2645-51. [PMID: 22533719 DOI: 10.1021/nl3012038] [Citation(s) in RCA: 122] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
In the past few years, a remarkable progress has been made in unveiling novel and unique optical properties of strongly coupled plasmonic nanostructures, known as plasmonic molecules. However, realization of such plasmonic molecules using nonlithographic approaches remains challenging largely due to the lack of facile and robust assembly methods. Previous attempts to achieve plasmonic nanoassemblies using molecular ligands were limited to dipolar assembly of nanostructures, which typically results in polydisperse linear and branched chains. Here, we demonstrate that core-satellite structures comprised of shape-controlled plasmonic nanostructures can be achieved through self-assembly using simple molecular cross-linkers. Prevention of self-conjugation and promotion of cross-conjugation among cores and satellites plays a key role in the formation of core-satellite heteroassemblies. The in-built electromagnetic hot-spots and Raman reporters of core-satellite structures make them excellent candidates for surface-enhanced Raman scattering probes.
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Affiliation(s)
- Naveen Gandra
- Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, 1 Brookings Drive, St. Louis, Missouri 63130, USA
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1372
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Saha K, Agasti SS, Kim C, Li X, Rotello VM. Gold nanoparticles in chemical and biological sensing. Chem Rev 2012; 112:2739-79. [PMID: 22295941 PMCID: PMC4102386 DOI: 10.1021/cr2001178] [Citation(s) in RCA: 2759] [Impact Index Per Article: 229.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Krishnendu Saha
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, MA 01003, USA
| | - Sarit S. Agasti
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, MA 01003, USA
| | - Chaekyu Kim
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, MA 01003, USA
| | - Xiaoning Li
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, MA 01003, USA
| | - Vincent M. Rotello
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, MA 01003, USA
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1373
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Shegai T, Johansson P, Langhammer C, Käll M. Directional scattering and hydrogen sensing by bimetallic Pd-Au nanoantennas. NANO LETTERS 2012; 12:2464-9. [PMID: 22449167 DOI: 10.1021/nl300558h] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Nanoplasmonic sensing is typically based on quantification of changes in optical extinction or scattering spectra. Here we explore the possibility of facile self-referenced hydrogen sensing based on angle-resolved spectroscopy. We found that heterodimers built from closely spaced gold and palladium nanodisks exhibit pronounced directional scattering, that is, for particular wavelengths, much more light is scattered toward the Au than toward the Pd particle in a dimer. The effect is due to optical phase shifts associated with the material asymmetry and therefore highly sensitive to changes in the permittivity of Pd induced by hydrogen loading. In a wider perspective, the results suggest that directional scattering from bimetallic antennas, and material asymmetry in general, may offer many new routes toward novel nanophotonic sensing schemes.
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Affiliation(s)
- Timur Shegai
- Department of Applied Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden
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1374
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Li DX, Zhang JF, Jang YH, Jang YJ, Kim DH, Kim JS. Plasmonic-coupling-based sensing by the assembly and disassembly of dipycolylamine-tagged gold nanoparticles induced by complexing with cations and anions. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:1442-8. [PMID: 22378699 DOI: 10.1002/smll.201102335] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2011] [Indexed: 05/12/2023]
Abstract
A surface-plasmon-coupling-mediated sensor system is developed based on Au nanoparticles tagged with a coordinative dipycolylamine and lipoyl-anchored naphthalimide derivative (AuNP@DPA). The AuNPs with tailored ligands exhibit distinct sensing activity via sequential assembly into nanoparticle aggregates induced by metal ion complexing, and disassembly in the presence of pyrophosphate (PPi) anions, which is accompanied by a swift, reversible color change due to a surface plasmon resonance coupling effect. It is found that divalent metal ions are more effective than mono- or tri-valent ions in the aggregate formation process, Mn(2+)-induced aggregates are more sensitive to the capture of PPi anions than other AuNP aggregates, and the disassembly upon anion complexation exhibits a highly selective response. The AuNP@DPA-based molecular recognition system also demonstrates a viable performance for the detection of total selective metal ions present in different types of water analytes.
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Affiliation(s)
- Dong Xiang Li
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
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1375
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Roke S, Gonella G. Nonlinear Light Scattering and Spectroscopy of Particles and Droplets in Liquids. Annu Rev Phys Chem 2012; 63:353-78. [DOI: 10.1146/annurev-physchem-032511-143748] [Citation(s) in RCA: 185] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sylvie Roke
- Laboratory for fundamental BioPhotonics (LBP), Institute of Bioengineering (IBI), School of Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland;
- Max-Planck Institute for Metals Research, 70569 Stuttgart, Germany
| | - Grazia Gonella
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122;
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1376
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Chang YC, Wang SM, Chung HC, Tseng CB, Chang SH. Observation of absorption-dominated bonding dark plasmon mode from metal-insulator-metal nanodisk arrays fabricated by nanospherical-lens lithography. ACS NANO 2012; 6:3390-3396. [PMID: 22435958 DOI: 10.1021/nn300420x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Plasmon hybridization modes are observed in the extinction spectra of a metal-insulator-metal (MIM) nanodisk array fabricated using nanospherical-lens lithography. Two distinct hybridization modes are observed in this vertically aligned configuration. Theoretical simulation indicates that the bonding mode located at a lower energy level exhibits an antiphase charge distribution and corresponds to the dark plasmon mode. This is vastly different compared to antibonding dark plasmon mode observed in the conventional dimer configuration. The observed mode is tunable over a wide spectral range simply by varying the insulator thickness and the diameters of the MIM nanodisks. Absorption is the dominating extinction process for the dark plasmon, while scattering dominates the bright plasmon mode. The ability to experimentally measure and tune dark plasmon modes using a MIM configuration should catalyze more novel studies that take full advantages of the absorption-dominated dark plasmon mode.
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Affiliation(s)
- Yun-Chorng Chang
- Department of Photonics and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701, Taiwan.
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1377
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Sun J, Dong J, Sun D, Guo Z, Gu N. Magnetically mediated vortexlike assembly of gold nanoshells. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:6520-6526. [PMID: 22468960 DOI: 10.1021/la300212d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Gold nanoshells currently attract increasing research interests due to the important role in many subjects. For practical applications, random arrangement of the nanoparticles is often unfavored so that the assembly of gold nanoshells is becoming a central issue. We here proposed to utilize time-variant magnetic field to direct the assembly of gold nanoshells. It was discovered that the alternating magnetic field can mediate the vortex-like assembly of gold nanoshells. The mechanism was explored and thought to be relative with the electric field of induction which caused the thermal gradient on the substrate and the electric force. The vortexlike structure as well as the assembly mechanism will play an important role in research and application of gold nanomaterials.
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Affiliation(s)
- Jianfei Sun
- State Key Laboratory of Bioelectronics and Jiangsu Key Laboratory of Biomaterials and Devices, School of Biological Science and Medical Engineering, Southeast University , Nanjing 210009, P. R. China
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1378
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Yan H, Li X, Chandra B, Tulevski G, Wu Y, Freitag M, Zhu W, Avouris P, Xia F. Tunable infrared plasmonic devices using graphene/insulator stacks. NATURE NANOTECHNOLOGY 2012; 7:330-4. [PMID: 22522668 DOI: 10.1038/nnano.2012.59] [Citation(s) in RCA: 340] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Accepted: 03/22/2012] [Indexed: 05/22/2023]
Abstract
The collective oscillation of carriers--the plasmon--in graphene has many desirable properties, including tunability and low loss. However, in single-layer graphene, the dependence on carrier concentration of both the plasmonic resonance frequency and magnitude is relatively weak, limiting its applications in photonics. Here, we demonstrate transparent photonic devices based on graphene/insulator stacks, which are formed by depositing alternating wafer-scale graphene sheets and thin insulating layers, then patterning them together into photonic-crystal-like structures. We show experimentally that the plasmon in such stacks is unambiguously non-classical. Compared with doping in single-layer graphene, distributing carriers into multiple graphene layers effectively enhances the plasmonic resonance frequency and magnitude, which is different from the effect in a conventional semiconductor superlattice and is a direct consequence of the unique carrier density scaling law of the plasmonic resonance of Dirac fermions. Using patterned graphene/insulator stacks, we demonstrate widely tunable far-infrared notch filters with 8.2 dB rejection ratios and terahertz linear polarizers with 9.5 dB extinction ratios. An unpatterned stack consisting of five graphene layers shields 97.5% of electromagnetic radiation at frequencies below 1.2 THz. This work could lead to the development of transparent mid- and far-infrared photonic devices such as detectors, modulators and three-dimensional metamaterial systems.
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Affiliation(s)
- Hugen Yan
- IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, USA
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1379
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Navarro JRG, Manchon D, Lerouge F, Cottancin E, Lermé J, Bonnet C, Chaput F, Mosset A, Pellarin M, Parola S. Synthesis, electron tomography and single-particle optical response of twisted gold nano-bipyramids. NANOTECHNOLOGY 2012; 23:145707. [PMID: 22433232 DOI: 10.1088/0957-4484/23/14/145707] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A great number of works focus their interest on the study of gold nanoparticle plasmonic properties. Among those, sharp nanostructures appear to exhibit the more interesting features for further developments. In this paper, a complete study on bipyramidal-like gold nanostructures is presented. The nano-objects are prepared in high yield using an original method. This chemical process enables a precise control of the shape and the size of the particles. The specific photophysical properties of gold bipyramids in suspension are ripened by recording the plasmonic response of single and isolated objects. Resulting extinction spectra are precisely correlated to their geometrical structure by mean of electron tomography at the single-particle level. The interplay between the geometrical structure and the optical properties of twisted gold bipyramids is further discussed on the basis of numerical calculations. The influence of several parameters is explored such as the structural aspect ratio or the tip truncation. In the case of an incident excitation polarized along the particle long axis, this study shows how the plasmon resonance position can be sensitive to these parameters and how it can then be efficiently tuned on a large wavelength range.
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Affiliation(s)
- Julien R G Navarro
- Laboratoire de Chimie, ENS Lyon, CNRS, Université Claude Bernard Lyon 1, Université de Lyon, UMR 5182, 46 allée d'ltalie, 69364 Lyon, France
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1380
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Dasgupta A, Kumar GVP. Palladium bridged gold nanocylinder dimer: plasmonic properties and hydrogen sensitivity. APPLIED OPTICS 2012; 51:1688-1693. [PMID: 22505158 DOI: 10.1364/ao.51.001688] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2011] [Accepted: 10/21/2011] [Indexed: 05/31/2023]
Abstract
Plasmonic nanodimers facilitate electromagnetic hotspots at their gap junction. By loading these gap junctions with nanomaterials, the plasmonic properties of nanodimer can be varied. In this study, we bridged the gap junction of gold (Au) nanocylinder dimer with palladium (Pd), and numerically evaluated the plasmonic properties of the designed nanostructure. We simulated the far-field extinction spectra of Pd bridged Au nanocylinder dimer, and identified the dipole and quadrupole plasmon modes at 839 and 578 nm, respectively. By varying the geometrical parameters of the Pd bridge, we revealed the ability to tune the dipolar plasmon resonance of the bridged dimer. Further, we exploited the hydrogen sensitivity of Pd bridge to harness the bridged-Au dimer as nanoplasmonic hydrogen sensor. Such nano-optical detection platforms have minimal spatial footprint and can be further harnessed for chip-based plasmonic sensing.
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Affiliation(s)
- Arindam Dasgupta
- Photonics and Optical Nanoscopy Laboratory, Division of Physics and Chemistry, Indian Institute of Science Education and Research (IISER), Pune, India
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1381
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Nepal D, Park K, Vaia RA. High-yield assembly of soluble and stable gold nanorod pairs for high-temperature plasmonics. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:1013-1020. [PMID: 22307829 DOI: 10.1002/smll.201102152] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Revised: 12/02/2011] [Indexed: 05/31/2023]
Abstract
Colloidal synthetic approaches to discrete, soluble plasmonic architectures, such as nanorod pairs, offer numerous advantages relative to lithographic techniques, including compositionally asymmetric structures, atomically smooth surfaces, and continuous fabrication. Density-driven colloidal assembly, such as by solvent evaporation, produces some intriguing structures, e.g., particle chains; however, controllability and post-processibility of the final architecture is inadequate. Also the limited quantity of product nominally comprises a broad distribution of assembly size and type. Herein, the high-yield formation of soluble, stable, and compositionally discrete gold nanorod (Au NR) architectures by inducing-then arresting-flocculation is demonstrated using bifunctional nanorods and reversible modulation of solvent quality to deplete and reassemble an electrostatic stabilization layer, thereby eliminating the need for an additional encapsulant. Analogous to dimer formation during step-growth polymerization, the initial yield of Au nanorod side-by-side pairs can be greater than 50%. The high solubility and stability of the assembly enable purification, scale-up of nanomolarity solutions, and subsequent chemical modification of the assembled product. As an example, in situ silica deposition via Stöber synthesis onto the assembled pair produces highly processable nanostructures with a single pair of embedded Au NRs at their center, which exhibit thermal stability at temperatures in excess of 700 °C.
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Affiliation(s)
- Dhriti Nepal
- Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433-7702, USA
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1382
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Tan JZ, Fernández Y, Liu D, Maroto-Valer M, Bian J, Zhang X. Photoreduction of CO2 using copper-decorated TiO2 nanorod films with localized surface plasmon behavior. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.02.016] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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1383
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Ye X, Jin L, Caglayan H, Chen J, Xing G, Zheng C, Doan-Nguyen V, Kang Y, Engheta N, Kagan CR, Murray CB. Improved size-tunable synthesis of monodisperse gold nanorods through the use of aromatic additives. ACS NANO 2012; 6:2804-17. [PMID: 22376005 DOI: 10.1021/nn300315j] [Citation(s) in RCA: 462] [Impact Index Per Article: 38.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
We report an improved synthesis of colloidal gold nanorods (NRs) by using aromatic additives that reduce the concentration of hexadecyltrimethylammonium bromide surfactant to ~0.05 M as opposed to 0.1 M in well-established protocols. The method optimizes the synthesis for each of the 11 additives studied, allowing a rich array of monodisperse gold NRs with longitudinal surface plasmon resonance tunable from 627 to 1246 nm to be generated. The gold NRs form large-area ordered assemblies upon slow evaporation of NR solution, exhibiting liquid crystalline ordering and several distinct local packing motifs that are dependent upon the NR's aspect ratio. Tailored synthesis of gold NRs with simultaneous improvements in monodispersity and dimensional tunability through rational introduction of additives will not only help to better understand the mechanism of seed-mediated growth of gold NRs but also advance the research on plasmonic metamaterials incorporating anisotropic metal nanostructures.
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Affiliation(s)
- Xingchen Ye
- Department of Chemistry, University of Pennsylvania, Pennsylvania 19104, USA
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1384
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Zhu Z, Liu W, Li Z, Han B, Zhou Y, Gao Y, Tang Z. Manipulation of collective optical activity in one-dimensional plasmonic assembly. ACS NANO 2012; 6:2326-2332. [PMID: 22324310 DOI: 10.1021/nn2044802] [Citation(s) in RCA: 145] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The manipulation of the chirality and corresponding optical activity in the visible-near-infrared (NIR) light region is significant to realize applications in the fields of chemical sensing, enantioselective separation, chiral nanocatalysis, and optical devices. We studied the plasmon-induced circular dichroism (CD) response by one-dimensional (1D) assembly of cysteine (CYS) and gold nanorods (GNRs). Typically, GNRs can form end-to-end assembly through the electrostatic attraction of CYS molecules preferentially attached on the ends of different GNRs. CD responses are observed at both the UV and visible-NIR light region in the 1D assembly, which are assigned to the CYS molecules and the GNRs, respectively. In addition, the wavelength of the CD responses can be manipulated from 550 nm to more than 900 nm through altering the aspect ratios of GNRs in 1D assembly. Anisotropic enhancement of optical activity is discovered, suggesting that the enhancement of the longitudinal localized surface plasmon resonance (LSPR) peak of GNRs in the CD response is much more apparent than that of the transverse LSPR. The CD responses of individual CYS-attached GNRs and CYS-assembled gold nanoparticles (GNPs) substantiate that the form of assembly and the shape of building blocks are significant not only for the intensity but for the line shape of the CD signals.
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Affiliation(s)
- Zhening Zhu
- Laboratory of Nanomaterials, National Center for Nanoscience and Technology, Beijing, People's Republic of China
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1385
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Lohmüller T, Iversen L, Schmidt M, Rhodes C, Tu HL, Lin WC, Groves JT. Single molecule tracking on supported membranes with arrays of optical nanoantennas. NANO LETTERS 2012; 12:1717-21. [PMID: 22352856 PMCID: PMC3626319 DOI: 10.1021/nl300294b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Revised: 02/15/2012] [Indexed: 05/16/2023]
Abstract
Coupling of the localized surface plasmons between two closely apposed gold nanoparticles (nanoantenna) can cause strong enhancements of fluorescence or Raman signal intensity from molecules in the plasmonic "hot-spot". Harnessing these properties for practical applications is challenging due to the need to fabricate gold particle arrays with well-defined nanometer spacing and a means of delivering functional molecules to the hot-spot. We report fabrication of billions of plasmon-coupled nanostructures on a single substrate by a combination of colloid lithography and plasma processing. Controlled spacing of the nanoantenna gaps is achieved by taking advantage of the fact that polystyrene particles melt together at their contact point during plasma processing. The resulting polymer thread shadows a gap of well-defined spacing between each pair of gold triangles in the final array. Confocal surface-enhanced Raman spectroscopy imaging confirms the array is functionally uniform. Furthermore, a fully intact supported membrane can be formed on the intervening substrate by vesicle fusion. Trajectories of freely diffusing individual proteins are traced as they sequentially pass through, and are enhanced by, multiple gaps. The nanoantenna array thus enables enhanced observation of a fluid membrane system without static entrapment of the molecules.
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Affiliation(s)
- T. Lohmüller
- Howard Hughes Medical Institute,
Department of Chemistry, University of California, Berkeley, California 94720, United States
- Physical Biosciences and Materials
Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
| | - L. Iversen
- Howard Hughes Medical Institute,
Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - M. Schmidt
- Energy Biosciences Institute, University of California, Berkeley, California 94720,
United States
| | - C. Rhodes
- Howard Hughes Medical Institute,
Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - H.-L. Tu
- Howard Hughes Medical Institute,
Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - W.-C. Lin
- Howard Hughes Medical Institute,
Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - J. T. Groves
- Howard Hughes Medical Institute,
Department of Chemistry, University of California, Berkeley, California 94720, United States
- Physical Biosciences and Materials
Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
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1386
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Kuzyk A, Schreiber R, Fan Z, Pardatscher G, Roller EM, Högele A, Simmel FC, Govorov AO, Liedl T. DNA-based self-assembly of chiral plasmonic nanostructures with tailored optical response. Nature 2012; 483:311-4. [DOI: 10.1038/nature10889] [Citation(s) in RCA: 1606] [Impact Index Per Article: 133.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2011] [Accepted: 01/17/2012] [Indexed: 01/24/2023]
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1387
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Taubert R, Hentschel M, Kästel J, Giessen H. Classical analog of electromagnetically induced absorption in plasmonics. NANO LETTERS 2012; 12:1367-71. [PMID: 22273467 DOI: 10.1021/nl2039748] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The ability to manipulate the phase shift between two resonantly coupled plasmonic oscillators in a controlled fashion has been unavailable up to now. Here we present a strategy to overcome this limitation by employing the benefits of near-field coupling on the one hand and retardation effects due to far-field coupling on the other hand. We theoretically and experimentally demonstrate that in the intermediate regime the coupling of a broad dipolar to a narrow dark quadrupolar plasmon resonance is possible while simultaneously allowing for a retardation-induced phase shift. This leads to constructive interference and enhanced absorption. The observed phenomenon can thus be termed a classical analog of electromagnetically induced absorption.
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Affiliation(s)
- Richard Taubert
- 4th Physics Institute and Research Center SCoPE, University of Stuttgart, D-70569 Stuttgart, Germany
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1388
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Shao L, Fang C, Chen H, Man YC, Wang J, Lin HQ. Distinct plasmonic manifestation on gold nanorods induced by the spatial perturbation of small gold nanospheres. NANO LETTERS 2012; 12:1424-1430. [PMID: 22268670 DOI: 10.1021/nl2041063] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The plasmon coupling between a Au nanorod and a small Au nanosphere has been studied with scattering measurements, electrodynamic simulations, and model analysis. The spatial perturbation of the nanosphere leads to distinct spectral changes of the heterodimer. The plasmonic responses, including Fano resonance, are remarkably sensitive to the nanosphere position on the nanorod, the gap distance, and the nanocrystal dimensions. The nanosphere dipole is intriguingly found to rotate around the nanorod dipole to achieve favorable attractive interaction for the bonding dipole-dipole mode. The sensitive spectral response of the heterodimer to the spatial perturbation of the nanosphere offers an approach to designing plasmon rulers of two spatial coordinates for sensing and high-resolution measurements of distance changes.
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Affiliation(s)
- Lei Shao
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
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1389
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Duan H, Fernández-Domínguez AI, Bosman M, Maier SA, Yang JKW. Nanoplasmonics: classical down to the nanometer scale. NANO LETTERS 2012; 12:1683-9. [PMID: 22313285 DOI: 10.1021/nl3001309] [Citation(s) in RCA: 185] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
We push the fabrication limit of gold nanostructures to the exciting sub-nanometer regime, in which light-matter interactions have been anticipated to be strongly affected by the quantum nature of electrons in metals. Doing so allows us to (1) evaluate the validity of classical electrodynamics to describe plasmonic effects at this length scale and (2) witness the gradual (instead of sudden) evolution of plasmon modes when two gold nanoprisms are brought into contact. Using electron energy-loss spectroscopy and transmission electron microscope imaging, we investigated nanoprisms separated by gaps of only 0.5 nm and connected by conductive bridges as narrow as 3 nm. Good agreement of our experimental results with electromagnetic calculations and LC circuit models evidence the gradual evolution of the plasmonic resonances toward the quantum coupling regime. We demonstrate that down to the nanometer length scales investigated classical electrodynamics still holds, and a full quantum description of electrodynamics phenomena in such systems might be required only when smaller gaps of a few angstroms are considered. Our results show also the gradual onset of the charge-transfer plasmon mode and the evolution of the dipolar bright mode into a 3λ/2 mode as one literally bridges the gap between two gold nanoprisms.
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Affiliation(s)
- Huigao Duan
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602
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1390
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Marinica DC, Kazansky AK, Nordlander P, Aizpurua J, Borisov AG. Quantum plasmonics: nonlinear effects in the field enhancement of a plasmonic nanoparticle dimer. NANO LETTERS 2012; 12:1333-9. [PMID: 22320125 DOI: 10.1021/nl300269c] [Citation(s) in RCA: 115] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A fully quantum mechanical investigation using time-dependent density functional theory reveals that the field enhancement in a coupled nanoparticle dimer can be strongly affected by nonlinear effects. We show that both classical as well as linear quantum mechanical descriptions of the system fail even for moderate incident light intensities. An interparticle current resulting from the strong field photoemission tends to neutralize the plasmon-induced surface charge densities on the opposite sides of the nanoparticle junction. Thus, the coupling between the two nanoparticles and the field enhancement is reduced as compared to linear theory. A substantial nonlinear effect is revealed already at incident powers of 10(9) W/cm(2) for interparticle separation distances as large as 1 nm and down to the touching limit.
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Affiliation(s)
- D C Marinica
- Institut des Sciences Moléculaires d'Orsay, UMR 8214 CNRS-Université Paris-Sud, Bâtiment 351, 91405 Orsay Cedex, France
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1391
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Liu M, Li X, Karuturi SK, Tok AIY, Fan HJ. Atomic layer deposition for nanofabrication and interface engineering. NANOSCALE 2012; 4:1522-1528. [PMID: 22307135 DOI: 10.1039/c2nr11875k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Atomic layer deposition (ALD) provides a tool for conformal coating on high aspect-ratio nanostructures with excellent uniformity. It has become a technique for both template-directed nanofabrications and engineering of surface properties. This Feature Article highlights the application of ALD in selected fields including photonics, SERS and energy materials. Specifically, the topics include fabrication of plasmonic nanostructures for the SERS applications, fabrication of 3-D nanoarchitectured photoanodes for solar energy conversions (dye-sensitized solar cells and photoelectrochemical cells), and coating of electrodes to enhance the cyclic stability and thus device life span of batteries. Dielectric coating for tailoring optical properties of semiconductor nanostructures is also discussed as exemplified by ZnO nanowires. Future direction of ALD in these applications is discussed at the end.
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Affiliation(s)
- Monan Liu
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
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1392
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Chandra M, Dowgiallo AM, Knappenberger KL. Magnetic Dipolar Interactions in Solid Gold Nanosphere Dimers. J Am Chem Soc 2012; 134:4477-80. [DOI: 10.1021/ja210648a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Manabendra Chandra
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390,
United States
| | - Anne-Marie Dowgiallo
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390,
United States
| | - Kenneth L. Knappenberger
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390,
United States
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1393
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Qiu C, Zhang L, Wang H, Jiang C. Surface-Enhanced Raman Scattering on Hierarchical Porous Cuprous Oxide Nanostructures in Nanoshell and Thin-Film Geometries. J Phys Chem Lett 2012; 3:651-657. [PMID: 26286162 DOI: 10.1021/jz201694s] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Understanding the mechanism of surface-enhanced Raman scattering (SERS) of molecules on semiconductor nanostructures is directly related to our capabilities of designing and optimizing new SERS-active substrates for broad applications in the field of molecular detection and characterization. Here, we present an exploration of using cuprous oxide nanostructures with hierarchical porosity for enhancing Raman signals of adsorbed probe molecules. Distinct SERS signals were detected on both individual polycrystalline nanoshells and porous thin films composed of cuprous oxide nanocrystals. The observed enhancement of SERS signals can be interpreted as synergistic effects of strong chemical interactions between the probe molecules and cuprous oxide surfaces, localized electromagnetic field enhancement, and the unique hierarchical porosity of the nanostructures. Our work introduced a novel type of semiconductor substrates for high-performance SERS and extended the applications of cuprous oxide nanostructures to spectroscopy-based molecular sensing and characterizations.
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Affiliation(s)
- Chao Qiu
- †Department of Chemistry, University of South Dakota, Vermillion, South Dakota 57069, United States
| | - Li Zhang
- ‡Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Hui Wang
- ‡Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Chaoyang Jiang
- †Department of Chemistry, University of South Dakota, Vermillion, South Dakota 57069, United States
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1394
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1395
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Francescato Y, Giannini V, Maier SA. Plasmonic systems unveiled by Fano resonances. ACS NANO 2012; 6:1830-1838. [PMID: 22280066 DOI: 10.1021/nn2050533] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We show in detail how a derivation of Fano theory can serve as a new paradigm to study, understand, and control the interaction of nano-objects with light. Examples include a plasmonic crystal, a dolmen-type structure sustaining dark and bright plasmon modes, and a nanoshell heptamer. On the basis of only three coupling factors, a straightforward analytical formula is obtained, only assuming a plasmonic resonance for the continuum, and retaining the nonclassical character of the original formalism. It allows one to predict, reproduce, or decompose Fano interferences solely in terms of the physical properties of the uncoupled nanostructures when available, without the need of additional fitting parameters.
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Affiliation(s)
- Yan Francescato
- The Blackett Laboratory, Imperial College London , London SW7 2AZ, United Kingdom
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1396
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Manjavacas A, Nordlander P, García de Abajo FJ. Plasmon blockade in nanostructured graphene. ACS NANO 2012; 6:1724-31. [PMID: 22224435 DOI: 10.1021/nn204701w] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Among the many extraordinary properties of graphene, its optical response allows one to easily tune its interaction with nearby molecules via electrostatic doping. The large confinement displayed by plasmons in graphene nanodisks makes it possible to reach the strong-coupling regime with a nearby quantum emitter, such as a quantum dot or a molecule. In this limit, the quantum emitter can introduce a significant plasmon-plasmon interaction, which gives rise to a plasmon blockade effect. This produces, in turn, strongly nonlinear absorption cross sections and modified statistics of the bosonic plasmon mode. We characterize these phenomena by studying the equal-time second-order correlation function g((2))(0), which plunges below a value of 1, thus revealing the existence of nonclassical plasmon states. The plasmon-emitter coupling, and therefore the plasmon blockade, can be efficiently controlled by tuning the doping level of the graphene nanodisks. The proposed system emerges as a new promising platform to realize quantum plasmonic devices capable of commuting optical signals at the single-photon/plasmon level.
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1397
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Abstract
Recent progress in nanotechnology has enabled us to fabricate sub-wavelength architectures that function as antennas for improving the exchange of optical energy with nanoscale matter. We describe the main features of optical antennas for enhancing quantum emitters and review the designs that increase the spontaneous emission rate by orders of magnitude from the ultraviolet up to the near-infrared spectral range. To further explore how optical antennas may lead to unprecedented regimes of light-matter interactions, we draw a relationship between metal nanoparticles, radio-wave antennas and optical resonators. Our analysis points out how optical antennas may function as nanoscale resonators and how these may offer unique opportunities with respect to state-of-the-art microcavities.
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Affiliation(s)
- Mario Agio
- Laboratory of Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland.
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1398
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Garnett EC, Cai W, Cha JJ, Mahmood F, Connor ST, Greyson Christoforo M, Cui Y, McGehee MD, Brongersma ML. Self-limited plasmonic welding of silver nanowire junctions. NATURE MATERIALS 2012; 11:241-9. [PMID: 22306769 DOI: 10.1038/nmat3238] [Citation(s) in RCA: 496] [Impact Index Per Article: 41.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Accepted: 01/03/2012] [Indexed: 05/20/2023]
Abstract
Nanoscience provides many strategies to construct high-performance materials and devices, including solar cells, thermoelectrics, sensors, transistors, and transparent electrodes. Bottom-up fabrication facilitates large-scale chemical synthesis without the need for patterning and etching processes that waste material and create surface defects. However, assembly and contacting procedures still require further development. Here, we demonstrate a light-induced plasmonic nanowelding technique to assemble metallic nanowires into large interconnected networks. The small gaps that form naturally at nanowire junctions enable effective light concentration and heating at the point where the wires need to be joined together. The extreme sensitivity of the heating efficiency on the junction geometry causes the welding process to self-limit when a physical connection between the wires is made. The localized nature of the heating prevents damage to low-thermal-budget substrates such as plastics and polymer solar cells. This work opens new avenues to control light, heat and mass transport at the nanoscale.
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Affiliation(s)
- Erik C Garnett
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305-4045, USA
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1399
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Zhdanov VP, Kasemo B. Photo-induced chemical processes on metal–semiconductor–metal nanostructures. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2011.12.056] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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1400
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Biagioni P, Huang JS, Hecht B. Nanoantennas for visible and infrared radiation. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2012; 75:024402. [PMID: 22790344 DOI: 10.1088/0034-4885/75/2/024402] [Citation(s) in RCA: 263] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Nanoantennas for visible and infrared radiation can strongly enhance the interaction of light with nanoscale matter by their ability to efficiently link propagating and spatially localized optical fields. This ability unlocks an enormous potential for applications ranging from nanoscale optical microscopy and spectroscopy over solar energy conversion, integrated optical nanocircuitry, opto-electronics and density-of-states engineering to ultra-sensing as well as enhancement of optical nonlinearities. Here we review the current understanding of metallic optical antennas based on the background of both well-developed radiowave antenna engineering and plasmonics. In particular, we discuss the role of plasmonic resonances on the performance of nanoantennas and address the influence of geometrical parameters imposed by nanofabrication. Finally, we give a brief account of the current status of the field and the major established and emerging lines of investigation in this vivid area of research.
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Affiliation(s)
- Paolo Biagioni
- CNISM-Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
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