22 results found
lauri A, Velleman L, Xiao X, et al., 2017, 3D Confocal Raman Tomography to Probe Field Enhancements inside Supercluster Metamaterials, ACS Photonics, Vol: 4, Pages: 2070-2077, ISSN: 2330-4022
Spherical colloidal superclusters, composed from sub-100 nm plasmonic nanoparticles, have been proposed to possess collective plasmonic modes imbued with large field enhancements and tunable spectral response extending from the visible to infrared regions. Here, we report the experimental verification of collective near-IR plasmonic modes inside single superclusters, with dimensions ranging from 0.77 μm up to 2 μm. Raman reporters, coated onto the nanoparticle building blocks, were used as local probes of the electric field enhancement inside the metamaterial. By performing diffraction-limited 3D Raman tomography we were able to build up the electric field intensity distribution within the superclusters. We demonstrate that plasmonic responses of superclusters vary according to their size and excitation wavelength, in accordance with theoretical predictions of their tunable optical properties. The existence of three-dimensional internal collective modes in these superclusters enables the excitation of a large number of electromagnetic hot-spots, validating these self-assembled structures as promising candidates for molecular spectroscopy.
Cambiasso J, Grinblat G, Li Y, et al., 2017, Bridging the gap between dielectric nanophotonics and the visible regime with effectively lossless gallium phosphide antennas, Nano Letters, Vol: 17, Pages: 1219-1225, ISSN: 1530-6992
We present all-dielectric gallium phosphide (GaP) nanoantennas as an efficient nanophotonic platform for surface-enhanced second harmonic generation (SHG) and fluorescence (SEF), showing negligible losses in the visible range. Employing single GaP nanodisks, we observe an increase of more than 3 orders of magnitude in the SHG conversion signal in comparison with the bulk. This constitutes an SHG efficiency as large as 0.0002%, which is to the best of our knowledge the highest yet achieved value for a single nano-object in the optical region. Furthermore, we show that GaP dimers with 35 nm gap can enhance up to 3600 times the fluorescence emission of dyes located in the gap of the nanoantenna. This is accomplished by a fluorescence lifetime reduction of at least 22 times, accompanied by a high-intensity field confinement in the gap region. These results open new avenues for low-loss nanophotonics in the optical regime.
Nielsen MP, Lafone L, Rakovich A, et al., 2016, Adiabatic nanofocusing in hybrid gap plasmon waveguides on the silicon-on-insulator platform, Nano Letters, Vol: 16, Pages: 1410-1414, ISSN: 1530-6992
We present an experimental demonstration of a new class of hybrid gap plasmon waveguides on the silicon-on-insulator (SOI) platform. Created by the hybridization of the plasmonic mode of a gap in a thin metal sheet and the transverse-electric (TE) photonic mode of an SOI slab, this waveguide is designed for efficient adiabatic nanofocusing simply by varying the gap width. For gap widths greater than 100 nm, the mode is primarily photonic in character and propagation lengths can be many tens of micrometers. For gap widths below 100 nm, the mode becomes plasmonic in character with field confinement predominantly within the gap region and with propagation lengths of a few microns. We estimate the electric field intensity enhancement in hybrid gap plasmon waveguide tapers at 1550 nm by three-photon absorption of selectively deposited CdSe/ZnS quantum dots within the gap. Here, we show electric field intensity enhancements of up to 167 ± 26 for a 24 nm gap, proving the viability of low loss adiabatic nanofocusing on a commercially relevant photonics platform.
Nielsen MP, Lafone L, Rakovich A, et al., 2016, Hybrid gap plasmon waveguides on the silicon-on-insulator platform for adiabatic nanofocusing, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
Rakovich A, Albella P, Maier SA, 2015, Plasmonic Control of Radiative Properties of Semiconductor Quantum Dots Coupled to Plasmonic Ring Cavities, ACS NANO, Vol: 9, Pages: 2648-2658, ISSN: 1936-0851
Rakovich A, Donegan JF, Oleinikov V, et al., 2014, Linear and nonlinear optical effects induced by energy transfer from semiconductor nanoparticles to photosynthetic biological systems, JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS, Vol: 20, Pages: 17-32, ISSN: 1389-5567
Rakovich TY, Mahfoud OK, Mohamed BM, et al., 2014, Highly Sensitive Single Domain Antibody-Quantum Dot Conjugates for Detection of HER2 Biomarker in Lung and Breast Cancer Cells, ACS NANO, Vol: 8, Pages: 5682-5695, ISSN: 1936-0851
Lotya M, Rakovich A, Donegan JF, et al., 2013, Measuring the lateral size of liquid-exfoliated nanosheets with dynamic light scattering, NANOTECHNOLOGY, Vol: 24, ISSN: 0957-4484
Rakovich A, Nabiev I, Sukhanova A, et al., 2013, Large Enhancement of Nonlinear Optical Response in a Hybrid Nanobiomaterial Consisting of Bacteriorhodopsin and Cadmium Telluride Quantum Dots, ACS NANO, Vol: 7, Pages: 2154-2160, ISSN: 1936-0851
Oleinikov V, Bouchonville N, Sukhanova A, et al., 2012, Extension of the spectral range of bacteriorhodopsin functional activity by energy transfer from quantum dots, Conference on Nanobiosystems - Processing, Characterization, and Applications V, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
Davies G-L, McCarthy JE, Rakovich A, et al., 2012, Towards white luminophores: developing luminescent silica on the nanoscale, JOURNAL OF MATERIALS CHEMISTRY, Vol: 22, Pages: 7358-7365, ISSN: 0959-9428
Sukhanova A, Bouchonville N, Rakovich A, et al., 2011, Energy transfer from quantum dots improves proton pumping and photovoltaic proprieties of membrane protein bacteriorhodopsin within the QD/bacteriorhodopsin hybrid material, 241st National Meeting and Exposition of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Rakovich A, Sukhanova A, Lukashev E, et al., 2011, Semiconductor quantum dots as light-harvesting antennae for artificial photosynthesis applications, 241st National Meeting and Exposition of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Rakovich A, Sukhanova A, Bouchonville N, et al., 2010, Resonance Energy Transfer Improves the Biological Function of Bacteriorhodopsin within a Hybrid Material Built from Purple Membranes and Semiconductor Quantum Dots, NANO LETTERS, Vol: 10, Pages: 2640-2648, ISSN: 1530-6984
Rakovich A, Savateeva D, Rakovich T, et al., 2010, CdTe Quantum Dot/Dye Hybrid System as Photosensitizer for Photodynamic Therapy, NANOSCALE RESEARCH LETTERS, Vol: 5, Pages: 753-760, ISSN: 1931-7573
Rakovich A, Rakovich T, Kelly V, et al., 2010, Photosensitizer Methylene Blue-Semiconductor Nanocrystals Hybrid System for Photodynamic Therapy, JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, Vol: 10, Pages: 2656-2662, ISSN: 1533-4880
Nabiev I, Rakovich A, Sukhanova A, et al., 2010, Fluorescent Quantum Dots as Artificial Antennas for Enhanced Light Harvesting and Energy Transfer to Photosynthetic Reaction Centers, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 49, Pages: 7217-7221, ISSN: 1433-7851
Rakovich A, Rakovich YP, Donegan JF, 2009, Optical Studies of the Methylene Blue-Semiconductor Nanocrystals Hybrid System, e-Journal of Surface Science and Nanotechnology, Vol: 7, Pages: 349-353
Rakovich A, Sukhanova A, Bouchonville N, et al., 2009, Energy transfer processes in semiconductor quantum dots - bacteriorhodopsin hybrid system, Conference on Photonic Materials, Devices and Applications III, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
Rakovich AY, Stockhausen V, Susha AS, et al., 2008, Decorated wires as a reaction product of the microwave-assisted synthesis of CdSe in the presence of glycine, Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol: 317, Pages: 737-741, ISSN: 0927-7757
Byrne SJ, Williams Y, Davies A, et al., 2007, "Jelly dots": Synthesis and cytotoxicity studies of CdTe quantum dot-gelatin nanocomposites, SMALL, Vol: 3, Pages: 1152-1156, ISSN: 1613-6810
Susha AS, Rakovich AY, Sapra S, et al., 2007, DECORATED NANOWIRES AS A PRODUCT OF MICROWAVE SYNTHESIS OF CdSe IN PRESENCE OF GLYCINE, International Conference on Physics, Chemistry and Application of Nanostructures, Publisher: WORLD SCIENTIFIC PUBL CO PTE LTD, Pages: 293-+
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