Effect of dielectric interface on vector field mapping using gold nanoparticles as a local probe: Theory and experiment |
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| Authors: | KJ Ahn KG Lee DS Kim |
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| Institution: | 1. Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoi pr. 31, 199004 Sankt Petersburg, Russian Federation;2. National Research University of Information Technologies, Mechanics and Optics, Kronverkskiy pr., 49, 197101 Sankt Petersburg, Russian Federation;1. Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba 305-8563, Japan;1. Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8011, Japan;2. Graduate School of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan;1. International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur, Hyderabad 500005, Andhra Pradesh, India;2. Department of Materials Science and Engineering, Indian Institute of Technology Hyderabad, Yeddumailaram 502205, Andhra Pradesh, India;1. Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, F-34095 Montpellier, France;2. Manufacture Française des Pneumatiques MICHELIN, Site de Ladoux, 23 place des Carmes Déchaux, F-63 040 Clermont-Ferrand Cedex 9, France;3. Departamento de Física de Materiales y Centro de Física de Materiales CSIC-UPV/EHU, Universidad del País Vasco UPV/EHU, Paseo Manuel de Lardizabal 5, E-20018 San Sebastian, Spain;4. Institut für Physik, Martin-Luther Universität Halle Wittenberg, D-06099 Halle (Saale), Germany |
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| Abstract: | We investigate the influence of an air–dielectric interface on evanescent field vector detections using a gold nanoparticle as a local probe. In particular, we are interested in how the reflected field from the interface modifies the scattered signal, both in its strength and polarization direction depending on the detection angle. Dielectric–air or dielectric–water interface is a most widely used platform to perform single molecule spectroscopy. Knowing the electric field direction that the single molecule experiences is prerequisite for obtaining precise information on that molecule. The far-field scattered signal is derived by solving self-consistently the polarization induced on the gold nanoparticle by the local field and its radiated field in the Green function formalism. The scattered light intensity for each detector polarization direction is obtained by varying the dielectric constant, the distance from the gold nanoparticle to the interface, and the detection angle. The gold nanoparticle is modeled by a single dipole and coupled dipoles, respectively, and comparisons are given. Detection angle dependent far-field measurements are compared with theory, and they are in good agreements. Our study shows that for vector-field mapping on dielectric-interface, an ideal detector angle exists whereby the horizontal and vertical field components can be readily deduced without further correction. For any other detector angles, a correction factor should be taken into consideration to determine local field polarization direction. |
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