Anomalous group velocity at the high energy range of a 3D photonic nanostructure

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We report on a study of electromagnetic waves propagation in thin periodically ordered photonic nanostructures in the spectral range where the light wavelength is on the order of the lattice parameter. The vector KKR method we use allows us to determine the group index from finite photonic structure...

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Autores principales: Botey, M., Martorell, J., Dorado, L.A., Depine, R.A., Lozano, G., Míguez, H.
Formato: JOUR
Materias:
Electromagnetic waves
High energy physics
Nanostructures
Silicate minerals
Three dimensional
Crystal thickness
Direct identifications
Dispersion modes
Experimental observation
Group index
Group velocities
Group velocity reduction
High-energy range
Infinite periodic structure
KKR method
Lattice parameters
Light wavelengths
Opal films
Ordered structures
Photonic nanostructures
Photonic structure
Spectral range
Superluminal
Three-dimensional structure
Light velocity
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10944087_v18_n15_p15682_Botey
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_10944087_v18_n15_p15682_Botey
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spelling todo:paper_10944087_v18_n15_p15682_Botey2023-10-03T16:05:09Z Anomalous group velocity at the high energy range of a 3D photonic nanostructure Botey, M. Martorell, J. Dorado, L.A. Depine, R.A. Lozano, G. Míguez, H. Electromagnetic waves High energy physics Nanostructures Silicate minerals Three dimensional Crystal thickness Direct identifications Dispersion modes Experimental observation Group index Group velocities Group velocity reduction High-energy range Infinite periodic structure KKR method Lattice parameters Light wavelengths Opal films Ordered structures Photonic nanostructures Photonic structure Spectral range Superluminal Three-dimensional structure Light velocity We report on a study of electromagnetic waves propagation in thin periodically ordered photonic nanostructures in the spectral range where the light wavelength is on the order of the lattice parameter. The vector KKR method we use allows us to determine the group index from finite photonic structures including extinction providing confirmation of recently emerged results. We show that for certain frequencies the group velocity of opal slabs can either be superluminal or approach zero depending on the crystal thickness and the unavoidable presence of losses. In some cases, group velocity can be negative. Such behavior can be clearly attributed to the finite character of the three-dimensional structure and reproduces previously reported experimental observations. Calculations show that contrary to the predictions of extraordinary group velocity reductions for infinite periodic structures, the group velocity of real opals may exhibit strong fluctuations at the high energy range. Hence, a direct identification between the calculated anomalous group velocities, for an actual opal film, and the predicted propagating low dispersion modes for an ideal infinite ordered structure seems difficult to establish. © 2010 Optical Society of America. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10944087_v18_n15_p15682_Botey
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Electromagnetic waves
High energy physics
Nanostructures
Silicate minerals
Three dimensional
Crystal thickness
Direct identifications
Dispersion modes
Experimental observation
Group index
Group velocities
Group velocity reduction
High-energy range
Infinite periodic structure
KKR method
Lattice parameters
Light wavelengths
Opal films
Ordered structures
Photonic nanostructures
Photonic structure
Spectral range
Superluminal
Three-dimensional structure
Light velocity
spellingShingle Electromagnetic waves
High energy physics
Nanostructures
Silicate minerals
Three dimensional
Crystal thickness
Direct identifications
Dispersion modes
Experimental observation
Group index
Group velocities
Group velocity reduction
High-energy range
Infinite periodic structure
KKR method
Lattice parameters
Light wavelengths
Opal films
Ordered structures
Photonic nanostructures
Photonic structure
Spectral range
Superluminal
Three-dimensional structure
Light velocity
Botey, M.
Martorell, J.
Dorado, L.A.
Depine, R.A.
Lozano, G.
Míguez, H.
Anomalous group velocity at the high energy range of a 3D photonic nanostructure
topic_facet Electromagnetic waves
High energy physics
Nanostructures
Silicate minerals
Three dimensional
Crystal thickness
Direct identifications
Dispersion modes
Experimental observation
Group index
Group velocities
Group velocity reduction
High-energy range
Infinite periodic structure
KKR method
Lattice parameters
Light wavelengths
Opal films
Ordered structures
Photonic nanostructures
Photonic structure
Spectral range
Superluminal
Three-dimensional structure
Light velocity
description We report on a study of electromagnetic waves propagation in thin periodically ordered photonic nanostructures in the spectral range where the light wavelength is on the order of the lattice parameter. The vector KKR method we use allows us to determine the group index from finite photonic structures including extinction providing confirmation of recently emerged results. We show that for certain frequencies the group velocity of opal slabs can either be superluminal or approach zero depending on the crystal thickness and the unavoidable presence of losses. In some cases, group velocity can be negative. Such behavior can be clearly attributed to the finite character of the three-dimensional structure and reproduces previously reported experimental observations. Calculations show that contrary to the predictions of extraordinary group velocity reductions for infinite periodic structures, the group velocity of real opals may exhibit strong fluctuations at the high energy range. Hence, a direct identification between the calculated anomalous group velocities, for an actual opal film, and the predicted propagating low dispersion modes for an ideal infinite ordered structure seems difficult to establish. © 2010 Optical Society of America.
format JOUR
author Botey, M.
Martorell, J.
Dorado, L.A.
Depine, R.A.
Lozano, G.
Míguez, H.
author_facet Botey, M.
Martorell, J.
Dorado, L.A.
Depine, R.A.
Lozano, G.
Míguez, H.
author_sort Botey, M.
title Anomalous group velocity at the high energy range of a 3D photonic nanostructure
title_short Anomalous group velocity at the high energy range of a 3D photonic nanostructure
title_full Anomalous group velocity at the high energy range of a 3D photonic nanostructure
title_fullStr Anomalous group velocity at the high energy range of a 3D photonic nanostructure
title_full_unstemmed Anomalous group velocity at the high energy range of a 3D photonic nanostructure
title_sort anomalous group velocity at the high energy range of a 3d photonic nanostructure
url http://hdl.handle.net/20.500.12110/paper_10944087_v18_n15_p15682_Botey
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