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Phase front design with metallic pillar arrays.

Lieven Verslegers¹, Peter B Catrysse, Zongfu Yu

¹E. L. Ginzton Laboratory and Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA.

|March 19, 2010

Summary

We numerically designed phase fronts using metallic pillars, tuning transmission phase delay with geometry. This enables metallic microlenses and broader integrated photonic components.

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Area of Science:

Optics and Photonics
Metamaterials
Nanophotonics

Background:

Phase front manipulation is crucial for optical devices.
Metamaterials offer novel ways to control light.
Controlling local phase delay is key for advanced optical components.

Purpose of the Study:

To numerically demonstrate the design of phase fronts using metallic pillar arrays.
To show that local geometry controls the transmission phase delay.
To apply these principles to create a metallic microlens.

Main Methods:

Three-dimensional finite-difference frequency-domain (FDFD) numerical simulations.
Design and analysis of metallic pillar arrays with varying geometries.
Characterization of transmission phase delay through the structures.

Main Results:

Successfully designed phase fronts using metallic pillar arrays.
Demonstrated that local geometric variations tune the phase delay upon transmission.
Fabricated a functional metallic microlens based on the design principles.

Conclusions:

Metallic pillar arrays can be used to engineer phase fronts.
Local geometry is a powerful tool for controlling light transmission phase.
The design principles are applicable to various wavelength-size integrated photonic components.