Bulletin of the American Physical Society
Joint Fall 2012 Meeting of the Texas Sections of the APS, AAPT, and Zone 13 of the SPS
Volume 57, Number 10
Thursday–Saturday, October 25–27, 2012; Lubbock, Texas
Session E5: Nanoscience |
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Chair: Mark Holtz, Texas Tech University Room: Holiday Inn Towers University B |
Friday, October 26, 2012 3:30PM - 3:42PM |
E5.00001: Methods of measuring chitosan and gold interaction in the formation of biocompatible gold nanoparticles Samantha Franklin, Kelly Nash, Zannatul Yasmin Chitosan, a macromolecule, taken from crustaceans, has been used to create biocompatible gold nanoparticles (AuNPs). In this study, the formation of the gold nanoparticles synthesized with the chitosan solution was measured using different UV methods. The UV light is used to reduce the Au ions in the solution into gold nanoparticles, in which the result is biocompatible nanoparticles upon reduction. Different molar concentrations of a monovalent salt, such as sodium chloride (NaCl), were added to the chitosan and gold solution, and the interactions of the chitosan and NaCl with the gold formation were also measured. This was done to study the influence of the chitosan on the shape and size of the nanoparticles that formed. In this study, two different types of UV light were used; a Spectrolinker XL-1500UV Crosslinker with a wavelength ($\lambda$) at 365nm and an Nd:YAG laser with $\lambda$ at 355nm. Samples that were measured were dilute solutions and concentrations, which allow for measuring morphology with dependent optical response that can be observed with certain optical spectra systems. Formation of the particles were studied using scanning electron microscopy (SEM) and a dynamic light scattering system (DLS) that allowed for measurement of the zeta-potential ($\zeta$). [Preview Abstract] |
Friday, October 26, 2012 3:42PM - 3:54PM |
E5.00002: Optical Wide-Field Nanoscope Charles Regan, Ayrton Bernussi, Luis Grave de Peralta We describe the wide-field optical nanoimaging capabilities of a novel nanoscope based on the surface plasmon polariton (SPP) tomography technique. In contrast to other optical subwavelength resolution techniques, in our approach for imaging nanosize features, enhanced evanescent waves are coupled to the far-field via leakage radiation associated with SPPs excited by near-field fluorescence; therefore wide-field images which are not out-of-plane diffraction-limited are formed directly in the microscope's camera. [Preview Abstract] |
Friday, October 26, 2012 3:54PM - 4:06PM |
E5.00003: Experimental Investigation of Crystalline Structure of Synthetic Opals Using Light Scattering and Diffraction Methods Liliana Ruiz Diaz, Ainur Koshkinbayeva, Malik Rakhmanov, Anvar Zakhidov Synthetic opals are 3-dimensional photonic crystals made of mono-dispersed nano spheres fabricated with self-assembly techniques. Such opals usually consist of multiple domains of roughly homogenous regions which are randomly oriented with respect each other. We analyze the crystalline structure of individual domains in opals with diffraction measurements. The diffraction patterns were produced by focusing broadband white light onto a single domain which scattered the reflected light on a screen. We observed strong spatial dispersion in the scattered field which we analyzed using a semi-analytical model. The model allows us to include arbitrary crystalline lattices and introduce point, line, and plane defects in the domains. These experiments give us information about the structure of the opal, orientation of its domains, and presence of the crystalline defects. [Preview Abstract] |
Friday, October 26, 2012 4:06PM - 4:18PM |
E5.00004: Nanocomposite materials for radiation detection Sunil Sahi Zinc Oxide (ZnO) based scintillators are an interest of research due to its fast decay time. Scintillator requirements include the high light-yield, fast decay time and high density. ZnO based scintillators have relatively low light yield and low density. The quantum efficiency of ZnO based scintillators can be improved by energy transfer from Cerium fluoride (CeF$_{3})$. Herein, CeF$_{3}$/ZnO nanocomposites were synthesized to enhance the light output of ZnO. As synthesized, nanocomposites were characterized with XRD, Photoluminescence and UV-Vis. The nanocomposites show significant enhancement in the photoluminescence intensity of the ZnO due to the energy transfer from CeF$_{3}$ nanoparticles. [Preview Abstract] |
Friday, October 26, 2012 4:18PM - 4:30PM |
E5.00005: Study of Fluorescent Defect Properties in Nanodiamond Joseph Kimball, T. Zerda, B. Rout, A. Osipov The unique properties of fluorescent nanodiamonds make nanodiamonds preferred candidates for optical labels in biological and medical imaging. The basic theory behind the diamond crystal lattice and point defects within nanodiamond responsible for the fluorescence emitting nitrogen vacancy (N-V) center are presented. To fully implement and understand their optical and physical properties, this study uses two different techniques to create in raw diamond the defects responsible for the emission of a photostable spectrum containing Zero-Phonon Lines at 578 nm and 638 nm with fluorescent lifetimes ranging from 8-15 ns. Two different methods, irradiation and HPHT, are used to create the sought after (N-V) center. [Preview Abstract] |
Friday, October 26, 2012 4:30PM - 4:42PM |
E5.00006: Double Slit Diffraction Experiments with Surface Plasmon Polaritons Kamrul Alam, Luis Grave-de-Peralta Young's double slit experiment is the most famous interference experiment. Two parallel waveguides were used for producing interference patterns with Surface Plasmon Polaritons (SPP), which are equivalent to a double slit diffraction experiment. SPP interference was studied using SPP tomography. A series of experiments were done changing the separation and width of the waveguides. There was a good correspondence between observed and simulated interference patterns. [Preview Abstract] |
Friday, October 26, 2012 4:42PM - 4:54PM |
E5.00007: Practical metamaterial lenses for plasmonic applications Ongard Thiabgoh, Charles Regan, Ayrton Bernussi, Luis Grave de Peralta We explored two-dimensional plasmonic metamaterial lenses using surface plasmon polariton (SPP) tomography techniques. Metamaterial lenses were defined by a periodic array of air holes patterned on a thin film polymethyl methacrylate (PMMA) deposited in a typical Au/glass nanostructure. Surface emission and Fourier-plane images of SPP beams through the plasmonic lenses were analyzed to extract the lens focal length. The experimental extracted values show very good agreement to calculated values using conventional thin-lens equation. These practical plasmonic lenses are attractive for integrated plasmonic devices and lab-on-chip applications. [Preview Abstract] |
Friday, October 26, 2012 4:54PM - 5:06PM |
E5.00008: Surface plasmon excitations at \textit{well-defined} and \textit{not-so-well-defined} interfaces Kunal Tiwari, Ankit Singh, Suresh Sharma It is well known that travelling wave surface plasmon excitations (SPEs) can be generated by using well-defined Kretschmann geometry, in which a sample is sandwiched between a thin noble-metal film coating on the base of a high-index prism and glass slide. The onset of SPEs is evidenced by loss in the intensity of totally reflected light at a certain angle greater than the critical angle for total reflection. We have investigated the onset of SPEs in several samples, having both \textit{well-defined} and \textit{not-so-well-defined} metal/dielectric interfaces. Whereas SPEs at the first type of interfaces is understood, their occurrence at not-so-well-defined interfaces is hardly known. We have investigated the onset of SPEs at both types of interfaces in a series of samples prepared by using mixtures of nematic liquid crystal and 14 nm diameter Au NPs dispersions. In this presentation, we will show results from a series of measurements and simulations. [Preview Abstract] |
Friday, October 26, 2012 5:06PM - 5:18PM |
E5.00009: Wide-Angle Polarization-Dependent Diffraction in a Silicon Nano-Patterned Membrane Reflector Anton Gribovskiy, Travis Miller, Malik Rakhmanov, Santhad Chuwongin, Deyin Zhao, Weidong Zhou Silicon nano-patterned membrane reflectors (two-dimensional photonic crystals) are designed for use as broad-band reflectors or narrow-band optical filters and are capable of high reflectivity at selected wavelengths. High-sensitivity off-axis measurements reveal a wide-angle diffraction pattern produced by these reflectors. We conducted experiments using four laser wavelengths: 405, 635, 1064, and 1550 nm. For visible light, the diffraction pattern consists of a two-dimensional array of isolated bright spots. For infrared light, the diffraction changes drastically and a cross-shaped pattern appears in the reflected field. The pattern stretches almost 180 degrees in two orthogonal directions and strongly depends on the polarization of the incident beam. The intensity variations are present in the branch of the pattern which is perpendicular to the polarization of the incident beam. This effect modifies the reflective properties of the nano-patterned membranes and must be taken into account when considering the performance of these devices. [Preview Abstract] |
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