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Focusing effect of a graded index photonic crystal lens

✍ Scribed by C. Tan; Tapio Niemi; Changsi Peng; Markus Pessa

Book ID
103874934
Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
1016 KB
Volume
284
Category
Article
ISSN
0030-4018

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✦ Synopsis

We present a new graded-index photonic crystal (GRIN PhC) structure which can be made by laser interference lithography (LIL). It can be applied as miniaturized focusing lens. Numerical simulations are carried out on the structures with different widths, lengths, and modulations. In the qualitative analysis of the focal length, focusing of a GRIN PhC was proved to originate from both the graded sizes of the rods and multimode interference. Multimode interference dominates the focusing effect when a GRIN PhC has a small length or a small difference in the rod sizes. Intensity distributions in different cases were given to support the conclusion.

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✍ Foca, E. ;FΓΆll, H. ;Daschner, F. ;Sergentu, V. V. ;Carstensen, J. ;Frey, S. ;KnΓΆ πŸ“‚ Article πŸ“… 2005 πŸ› John Wiley and Sons 🌐 English βš– 152 KB

## Abstract This work reports measurements with a concave lens based on a photonic crystal (PC) structure, which was designed to have an effective index of refraction __n__~eff~ < 1 or even < 0, and which is intended as a model system for future down‐scaled optical elements based on PCs with an un