Design and fabrication of nano-structured gradient index microlenses.
We present a novel fabrication technology for nano-structured graded index micro-optical components, based on the stack-and-draw method used for photonic crystal fibres. These discrete structures can be described with an effective refractive index distribution. Furthermore we present spherical nano-structured microlenses with a flat facet fabricated with this method and designed using an algorithm based on the Maxwell-Garnett mixing formula. Finally we show theoretical verification by using FDTD simulations for a nano-structured lens as well as experimental data obtained in the microwave regime.
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Heriot Watt University, School of Engineering and Physical Sciences, Edinburgh, UK, EH14 4AS. fh22@hw.ac.uk
Buczynski
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R
Waddie
A J
AJ
Taghizadeh
M R
MR