Bulletin of the American Physical Society
APS March Meeting 2014
Volume 59, Number 1
Monday–Friday, March 3–7, 2014; Denver, Colorado
Session Y50: Nanoparticle Plasmonics |
Hide Abstracts |
Sponsoring Units: DCMP Room: Mile High Ballroom 1D |
Friday, March 7, 2014 8:00AM - 8:12AM |
Y50.00001: The Calculation of the Electronic Structure and Surface Plasmon for Semiconductor Quantum Dots Chin-Sheng Wu The surface conduction electrons of semiconductor quantum dots provide the collective excitations. The frequencies of emitted laser increase as the size of the quantum dots decrease. The size of the laser crystal can be controlled during synthesis so that the excitation and emission of the quantum dots are highly tunable. In order to understand their relation we have to find the electronic structure of the quantum dot first therefore the Kohn-Sham self- consistent method is used. The introduction of the electronic density directly into the macroscopic dielectric constant is used as a means of calculating the plasmon frequency of inhomogeneous electronic systems. Multi-step spatial dependent dielectric constant of quantum dot permits an estimate of the frequencies of these surface plasmon. The complete optical calculation requires the solution of Maxwell's equations and the usual boundary conditions. The most significant feature of these profiles for this calculation is the increase plasmon frequency with decreasing dot size. [Preview Abstract] |
Friday, March 7, 2014 8:12AM - 8:24AM |
Y50.00002: Selective Plasmon-Exciton Coupling in Nonradiative Energy Transfer: Donor-Selective versus Acceptor-Selective Pedro Ludwig Hernandez-Martinez, Tuncay Ozel, Evren Mutlugun, Onur Akin, Sedat Nizamoglu, Ilkem Ozge Ozel, Qing Zhang, Qihua Xiong, Hilmi Volkan Demir We report selectively plasmon-mediated nonradiative energy transfer between quantum dot (QD) emitters interacting with each other via F\"orster-type resonance energy transfer (FRET) under controlled plasmon coupling either to only the donor QDs or to only the acceptor QDs. The comparative results of theoretical modelling of the donor- and acceptor selective plasmon-exciton coupling of nonradiative energy transfer is presented. Here, we demonstrate the ability to enable/disable the coupled plasmon-exciton formation distinctly at the donor site or at the acceptor site of our choice. In the case of donor-selective plasmon-exciton coupling, we observed a substantial shortening in the donor QD lifetime from 1.33 to 0.29 ns as a result of plasmon-coupling to the donors and the FRET-assisted exciton transfer from the donors to the acceptors. This enhances the acceptor emission by a factor of 1.93. In the complementary case, we observed a 2.70-fold emission enhancement in the acceptor QDs as a result of the combined effects of the acceptor plasmon coupling and the FRET-assisted exciton feeding. Our theoretical results are in good agreement with the systematic experimental characterization. [Preview Abstract] |
Friday, March 7, 2014 8:24AM - 8:36AM |
Y50.00003: Plasmon Resonances and Size-Quantization Effects in Doped Semiconductor Nanocrystals Hui Zhang, Vikram Kulkarni, Emil Prodan, Peter Nordlander, Alexander O. Govorov Doped semiconductor nanocrystals represent a new type of quantum plasmonic material with optical resonances in the infrared spectral interval. These nanocrystals are fundamentally different from the metal nanoparticles because the electron density in a semiconductor can be tuned over a wide interval. Using the DFT-based time-dependent formalism, we computed the absorption spectra of doped quantum dots as a function of the number of carriers in a dot. The dynamic properties of doped quantum dots undergo an interesting transition from the size-quantization regime to the classical regime of plasmon oscillations. We demonstrate this quantum-to-classical transition for self-doped Copper Chalcogenides dots and for impurity-doped II-VI nanocrystals, and our simulations agree with the recent experiments well. The obtained results here can be used to predict and describe the optical properties of a broad class of semiconductor nanocrystals with quantum plasmonic resonances. [Preview Abstract] |
Friday, March 7, 2014 8:36AM - 8:48AM |
Y50.00004: Enhancement of light emission from anthracene-doped polyphenylsiloxane glass films containing Ag nanoparticles Ryoko Shimada, Megumi Kimura, Naoki Tarutani, Masahide Takahashi, Sanjay Karna, Arup Neogi Metal-nanoparticles can induce the localized electric filed in the narrow inter-particle gap. This localization can significantly enhance light emission from fluorescent materials embedding metal nanoparticles. In this phenomenon, the important factors are optical absorption and emission. However, the mechanism of enhancement has not been fully elucidated. In this work, anthracene-doped polyphenylsiloxane (PPS) glass films containing Ag nanoparticles (AgNPs) were prepared for the characterization of enhanced photoluminescence properties. AgNPs of $\sim$ 30nm diameter were synthesized by the polyol process, and mixed in the anthracene-doped PPS glass film. The anthracene-doped PPS thin films of thickness $\sim$ 200 nm, with/without AgNPs, were prepared by spin-casting method. The photoluminescence (PL), measured for these films at room temperature, changed with the anthracene and/or AgNPs concentrations. In the optimum condition, the integrated PL intensity enhancement factor was found to exceed 50. [Preview Abstract] |
Friday, March 7, 2014 8:48AM - 9:00AM |
Y50.00005: ABSTRACT WITHDRAWN |
Friday, March 7, 2014 9:00AM - 9:12AM |
Y50.00006: Tuning surface plasmon resonances of Ag nanoparticles Dexin Kong, Liying Jiang, Jos\'e Men\'endez, Jeff Drucker The localized surface plasmon resonance (LSPR) of metallic nanoparticles can be tuned by varying their size, shape and dielectric environment. Using spectroscopic ellipsometry, we investigate the LSPR energy of epitaxial Ag islands grown atop Si(100) and conclude that it can be tuned from the near-UV to the near-IR. We use two island sizes, 25 nm and 100 nm. Subsequent to Ag island growth, we deposited 30 nm equivalent thickness layers of Si or TiO$_{2}$ onto selected samples, enabling characterization of the epitaxial Ag island LSPR energy as a function of size and dielectric environment. For the bare Ag nanoparticles, we found that 25 nm Ag islands only show the dipolar LSPR (around 3.2 eV), and that the dipolar LSPR of 100 nm particles is located around 3.0 eV. The sample of 100 nm Ag islands also shows the multi-pole LSPR and bulk plasmon resonance. For 25 nm particles, the TiO$_{2}$ layer redshifts the LSPR to about 2.0 eV and the Si layer further redshifts the LSPR peak to around 1.1 eV. The TiO$_{2}$ layer redshifts the plasmon peak of the 100 nm islands to about 1.7 eV, and the Si layer shifts it to near 1.4 eV. These resonance energies semi-quantitatively agree with a simple analytical estimate of the dipole plasmon resonance. [Preview Abstract] |
Friday, March 7, 2014 9:12AM - 9:24AM |
Y50.00007: Effects of protein shell on properties of gold nanoparticles Anh Phan, Trinh X. Hoang, Dustin A. Tracy, Lilia M. Woods Optical properties and surface interactions between nanoparticles present opportunities for many novel applications. Protein-conjugated nanoparticles are of particular interest in regards to various medical applications. Theoretical investigations are presented of protein-coated gold nanoparticles using the Mie theory and the coupled dipole method. The Mie theory along with the absorption spectra can be used to quantitatively determine the number of protein bovine serum molecules that aggregate on the gold surfaces. The internal field of protein-conjugated gold nanoparticles remains constant for large wavelength of light due to screening from the protein shell. Effects from other nanoparticles significantly influence the peak position in the spectra. Our study shows the specific regimes in terms of optical characteristics where cascaded plasmon resonant field enhancement can be observed. Results for the maximum ratio of the internal field to the incident field is also obtained and discussed. [Preview Abstract] |
Friday, March 7, 2014 9:24AM - 9:36AM |
Y50.00008: Synthesis and electronic and magnetic properties of size and shape tunable Indium Nitride nanoparticles Basudeb Chakraborty, Remi Beaulac The basis of III-V semiconductor's functionality which plays a fundamental role in many of the technologies transforming everyday life, arises from a combination of distinctive properties such as high carrier mobility, highly favorable optoelectronic properties. Though there are numerous reported schemes to synthesize high quality II-VI semiconductor nanomaterials, efficient synthetic method to produce highly crystalline, monodispersed colloidal III-V semiconductor nanomaterials is still a handful. Here, wurtzite indium nitride (InN) nanocrystals have been synthesized with narrow size distribution, good crystallinity and reasonable amount of emissivity via a solution route using commercially available, inexpensive and easy to handle precursors. Quantum confinement in these InN nanocrystals is demonstrated and the band-gap (0.69 eV in bulk) is quantitatively correlated to the size of the nanoparticles. The size, shape and dispersity of the nanoparticles can be tuned by controlling the molar ratio of substrates and surfactants and rate of addition of the reactants. These nanocrystals doped with transition metals such as Manganese (Mn), Cobalt (Co) are expected to influence the electronic structure and magnetic properties of the material. [Preview Abstract] |
Friday, March 7, 2014 9:36AM - 9:48AM |
Y50.00009: Plasmonic Circular Dichroism of Chiral Nanoparticle Assemblies Zhiyuan Fan, Hui Zhang, Alexander Govorov Plasmonic circular dichroism(CD) of chiral metal nanoparticle(MNP) assemblies in the visible band results from dipolar and multipolar interaction between plasmons on MNPs. Both isotropic and anisotropic CD signals are extremely dimension-sensitive and strongly configuration-dependent. In this presentation, such geometry-dependence of plasmonic CD response will be analytically studied using an expansion of many-dipole interaction of the systems [1]. In the multipole regime, numerical simulations show new features of multipole plasmon interactions. One interesting observation is that a chiral equilateral tetramer made of 4 different NPs shows nearly zero CD response in the point dipole interaction regime but moderately strong CD response from multipole interaction of closely packed NP assemblies. Generally, CD signals of closely packed MNP assemblies are significantly enhanced and more sensitive to the geometric parameters. They can be used in many novel sensing applications as either solid-state or colloidal systems.\\[4pt] [1] Z. Fan, H. Zhang and A. O. Govorov, Optical Properties of Chiral Plasmonic Tetramers: Circular Dichroism and Multipole Effects, The Journal of Physical Chemistry C, 117 (28), 14770, 2013. [Preview Abstract] |
Friday, March 7, 2014 9:48AM - 10:00AM |
Y50.00010: Ultra-Low-Intensity Magneto-Optical and Mechanical Effects in Metal Nanocolloids Matthew Moocarme, Jorge-Luis Dominguez-Juarez, Luat Vuong Magneto-plasmonics is a designation generally associated with ferromagnetic-plasmonic materials since such optical responses from non-magnetic materials alone are considered weak. Here, we theoretically analyse, numerically investigate, and experimentally show that there exists a magneto-optical switching behaviour in noble-metal nanocolloids. The response is observable at ultra-low illumination intensities <1 W/cm$^2$ with DC magnetic fields <1 mT. Polarization-dependent nonzero time-averaged plasmonic loops and vortex power flows subsequently produce significant torque on nanoparticles and nanoclusters via dipole-dipole interactions. This work provides a new framework for the dynamical interaction between light polarization, nano-surfaces and material magnetization. [Preview Abstract] |
Friday, March 7, 2014 10:00AM - 10:12AM |
Y50.00011: F\"{o}rster-type Nonradiative Energy Transfer for Assemblies of Arrayed Nanostructures: Confinement Dimension vs. Stacking Dimension Hilmi Volkan Demir, Pedro Ludwig Hernandez Martinez, Alexander O. Govorov We report a theoretical framework of generalized theory for the F\"{o}rster-type NRET with mixed dimensionality in arrays. These include combinations of arrayed nanostructures made of nanoparticles (NPs) and nanowires (NWs) assemblies in one-dimension (1D), two-dimension (2D), and three-dimensions (3D) completing the framework for the transfer rates in all possible combinations of different confinement geometries and assembly architectures, we obtain a unified picture of NRET in assembled nanostructures arrays. We find that the generic NRET distance dependence is modified by arraying the nanostructures. For an acceptor NP the rate distance dependence changes from $\gamma \propto d^{-6}$ to $\gamma \propto d^{-5}$ when they are arranged in a 1D stack, and to $\gamma \propto d^{-4}$ when in a 2D array, and to $\gamma \propto d^{-3}$ when in a 3D array. Likewise, an acceptor NW changes its distance dependence from $\gamma \propto d^{-5}$ to $\gamma \propto d^{-4}$ when they are arranged in a 1D array and to $\gamma \propto d^{-3}$ when in a 2D array. These finding shows that the numbers of dimensions across which nanostructures are stacked is equally critical as the confinement dimension of the nanostructure in determining the NRET kinetics. [Preview Abstract] |
Friday, March 7, 2014 10:12AM - 10:24AM |
Y50.00012: Spectral splitting with a plasmonic nanowire on silicon chip Ru-Wen Peng, Qing Hu, Di-Hu Xu, Yu Zhou, Ren-Hao Fan, Nicholas X. Fang, Qian-Jin Wang, Xian-Rong Huang, Mu Wang On-chip nanophotonics serves as the foundation for the new generation of information technology, but it is challenged by the diffraction limit of light. Here we demonstrate that by cascading nano-corrugation gratings with different periodicities on silver nanowires atop silicon, different colors can be spatially separated and chronologically released at different grating junctions. The released light frequency depends on the grating arrangement and corrugation periodicities. Hence the nanowire acts as a spectral splitter for sorting/demultiplexing photons at different nano-scale positions with a ten-femtosecond-level interval. Such nanowires can be constructed further into compact 2D networks or circuits. This research may provide a promising approach for realizing spatiotemporal-sensitive spectral splitting and optical signal processing on nanoscales, and for general integration of nanophotonics with microelectronics. Reference: Q. Hu, D. H. Xu, Y. Zhou, R. W. Peng, R. H. Fan, N. X. Fang, Q. J. Wang, X. R. Huang, and Mu Wang, Sci. Rep. 3, 3095 (2013). [Preview Abstract] |
Friday, March 7, 2014 10:24AM - 10:36AM |
Y50.00013: Electronic Bias and Debye Length Calculations across Solid-state Nanopores for Self-referencing Arrays Muhammad Usman Raza, Sajid Saleem, Waqas Ali, Samir M. Iqbal Solid-state nanopores have been used as sensors for many types of biological entities. One application is the detection of disease biomarkers from body fluids. This requires selectivity in nanopores as well as high throughput of analysis. Generally, single nanopore is used for measurements but for high throughput and self-referenced selectivity, multiple nanopores are required on the same chip. To exclude the effects of the ionic current flowing through one nanopore from the adjacent nanopores, effects of electronic bias and Debye length were calculated. The simulations showed optimal distances needed between the nanopores and their measurement electrodes. A number of parameters like nanopore diameter, distance of electrodes from nanopores and amplitude of bias voltage showed dramatic effect on the Debye length. The simulation results were compared with the experimental data. [Preview Abstract] |
Friday, March 7, 2014 10:36AM - 10:48AM |
Y50.00014: Extended reflection coherent diffraction imaging of nanostructures on a tabletop Bosheng Zhang, Matthew Seaberg, Dennis Gardner, Elisabeth Shanblatt, Margaret Murnane, Henry Kapteyn, Daniel Adams We demonstrate the most general form of reflection-mode coherent diffraction imaging (CDI) that is applicable to non-isolated samples at high numerical aperture, by combining ptychography CDI with tilted plane correction. Tabletop high harmonic (HHG) beams at 30 nm with curved wavefronts are used to illuminate Ti nano-patterns on a Si substrate, at 45 degree incident angle. High fidelity images of the nanostructures are reconstructed, giving quantitative information for both the amplitude and phase (i.e. height to $\approx $1 nm precision), at a spatial resolution of $\approx $ 150 nm (limited by the geometry). The images compare favorably with both scanning electron and atomic force microscopies. Combined with our previous transmission-mode results, we have a general full-field, non-destructive, tabletop ultrafast microscope. In the future, we can improve the resolution using shorter wavelength HHG to image nanostructures with sub-10 nm spatial resolution and femtosecond time resolution, to capture ultrafast magnetic dynamics and heat transport at the nanoscale. [Preview Abstract] |
Friday, March 7, 2014 10:48AM - 11:00AM |
Y50.00015: Keyhole reflection-mode coherent diffraction imaging of nano-patterned surfaces using a tabletop EUV source Elisabeth Shanblatt, Matthew Seaberg, Bosheng Zhang, Dennis Gardner, Margaret Murnane, Henry Kapyetn, Daniel Adams We demonstrate the first reflection-mode keyhole coherent diffraction imaging (CDI) of non-isolated samples from a single diffraction pattern. A tabletop high harmonic generation (HHG) beam at 30 nm with a curved wave-front is used to illuminate Ti nano-patterns on a Si substrate at 45 degree angle of incidence. The 30 nm illumination beam profile is first characterized using ptychograhic CDI. Keyhole CDI is then used to image the nano-sample. In contrast to ptychography CDI, keyhole CDI needs only one diffraction pattern, and therefore requires no scanning of the sample. This is a significant advantage for ultrafast pump-probe imaging of thermal or spin transport, allowing a sequence of time-delayed images of the same region to be easily acquired. Our technique opens the door for imaging dynamics in nanostructures with sub-10 nm spatial resolution and fs temporal resolution. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700