Subwavelength lattice optics by evolutionary design.
Nano Lett
; 14(12): 7195-200, 2014 Dec 10.
Article
em En
| MEDLINE
| ID: mdl-25380062
ABSTRACT
This paper describes a new class of structured optical materials--lattice opto-materials--that can manipulate the flow of visible light into a wide range of three-dimensional profiles using evolutionary design principles. Lattice opto-materials are based on the discretization of a surface into a two-dimensional (2D) subwavelength lattice whose individual lattice sites can be controlled to achieve a programmed optical response. To access a desired optical property, we designed a lattice evolutionary algorithm that includes and optimizes contributions from every element in the lattice. Lattice opto-materials can exhibit simple properties, such as on- and off-axis focusing, and can also concentrate light into multiple, discrete spots. We expanded the unit cell shapes of the lattice to achieve distinct, polarization-dependent optical responses from the same 2D patterned substrate. Finally, these lattice opto-materials can also be combined into architectures that resemble a new type of compound flat lens.
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MEDLINE
Assunto principal:
Refratometria
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Algoritmos
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Cristalização
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Nanotecnologia
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Nanopartículas
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Lentes
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article