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• W2465718707 abstract "Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Timo Hakkarainen Name of the doctoral dissertation Electromagnetic Nanophotonics: Superlens Imaging of Dipolar Emitters and Cloaking in Weak Scattering Publisher School of Science Unit Department of Applied Physics Series Aalto University publication series DOCTORAL DISSERTATIONS 151/2012 Field of research Engineering Physics, Physics Manuscript submitted 21 August 2012 Date of the defence 30 November 2012 Permission to publish granted (date) 29 October 2012 Language English Monograph Article dissertation (summary + original articles) Abstract Two novel topics of nanophotonics, near-field imaging by superlenses and invisibility cloaking with slab scatterers, are investigated within the context of classical electromagnetic theory. In superlens imaging the objects are radiating point dipoles or externally excited dipolar emitters. The imaging element is a metallic or a slightly lossy negative-index material (NIM) slab with thickness of a few tens of nanometers. The electromagnetic angular spectrum representation is used to derive the Green tensors for the slab’s transmission and reflection. With this formalism the point-spread function of the imaging system is numerically evaluated, which enables one to assess resolution and image brightness. The dependence of image quality on the system parameters, dipole orientations, and near-field interactions among the objects and the lens is investigated. It is shown that both metallic and lossy metamaterial superlenses allow for image definitions beyond the usual diffraction limit of half the wavelength λ. High image quality requires a low-absorption slab and a good impedance match of the lens and its surroundings. In the immediate vicinity of the slab the dipole-slab interaction prevents the dipole from radiating. With low-loss NIM the interaction is weak and of short range. For silver slabs the interaction is stronger and reaches over the near-field zone, adversely influencing the imaging capabilities. With two dipole-like objects the emission is also suppressed by dipole-dipole near-field interactions, in particular with molecular objects while the effect is weak for glass or metallic nanoparticles. Due to interference subwavelength definition can only be attained for dipoles aligned predominantly orthogonal to the slab. Such a situation is achieved with excitation by total internal reflection. In optimal circumstances, resolutions of about λ/5 for silver and λ/10 for metamaterial lens are reached in three-dimensional configurations. Invisibility cloaking is considered within weak optical scattering in slab geometry. The conditions for cloaking in forward and backward directions are established, enabling the determination of the cloak’s refractive-index distribution for stratified objects. For any absorbing object forward cloaking is achieved with a lossy NIM or gainy ordinary-material slab. The cloaking is perfect for incident fields of any spatial structure and bandwidth. Backward cloaking is found possible with self-imaging fields. In both cases the cloak’s dispersive properties resemble those of the object.Two novel topics of nanophotonics, near-field imaging by superlenses and invisibility cloaking with slab scatterers, are investigated within the context of classical electromagnetic theory. In superlens imaging the objects are radiating point dipoles or externally excited dipolar emitters. The imaging element is a metallic or a slightly lossy negative-index material (NIM) slab with thickness of a few tens of nanometers. The electromagnetic angular spectrum representation is used to derive the Green tensors for the slab’s transmission and reflection. With this formalism the point-spread function of the imaging system is numerically evaluated, which enables one to assess resolution and image brightness. The dependence of image quality on the system parameters, dipole orientations, and near-field interactions among the objects and the lens is investigated. It is shown that both metallic and lossy metamaterial superlenses allow for image definitions beyond the usual diffraction limit of half the wavelength λ. High image quality requires a low-absorption slab and a good impedance match of the lens and its surroundings. In the immediate vicinity of the slab the dipole-slab interaction prevents the dipole from radiating. With low-loss NIM the interaction is weak and of short range. For silver slabs the interaction is stronger and reaches over the near-field zone, adversely influencing the imaging capabilities. With two dipole-like objects the emission is also suppressed by dipole-dipole near-field interactions, in particular with molecular objects while the effect is weak for glass or metallic nanoparticles. Due to interference subwavelength definition can only be attained for dipoles aligned predominantly orthogonal to the slab. Such a situation is achieved with excitation by total internal reflection. In optimal circumstances, resolutions of about λ/5 for silver and λ/10 for metamaterial lens are reached in three-dimensional configurations. Invisibility cloaking is considered within weak optical scattering in slab geometry. The conditions for cloaking in forward and backward directions are established, enabling the determination of the cloak’s refractive-index distribution for stratified objects. For any absorbing object forward cloaking is achieved with a lossy NIM or gainy ordinary-material slab. The cloaking is perfect for incident fields of any spatial structure and bandwidth. Backward cloaking is found possible with self-imaging fields. In both cases the cloak’s dispersive properties resemble those of the object." @default.
• W2465718707 created "2016-07-22" @default.
• W2465718707 creator A5084385933 @default.
• W2465718707 date "2012-01-01" @default.
• W2465718707 modified "2023-09-25" @default.
• W2465718707 title "Electromagnetic Nanophotonics: Superlens Imaging of Dipolar Emitters and Cloaking in Weak Scattering" @default.
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