Abstract

We show that a binary-staircase optical element can be engineered to exhibit an effective negative index of refraction, thereby expanding the range of optical properties theoretically available for future optoelectronic devices. The mechanism for achieving a negative-index lens is based on exploiting the periodicity of the surface corrugation. By designing and nanofabricating a planoconcave binary-staircase lens in the InP/InGaAsP platform, we have experimentally demonstrated at 1.55 μm that such negative-index concave lenses can focus plane waves. The beam propagation in the lens was studied experimentally and was in excellent agreement with the three-dimensional finite-difference time-domain numerical simulations.

Notes

Originally published in Applied Physics Letters, v.92 no.24 (2008). doi:10.1063/1.2942383

Keywords

finite difference time-domain analysis, microlenses, nanotechnology, refractive index

Subject Categories

Nanophotonics, Lenses

Disciplines

Nanoscience and Nanotechnology | Optics

Publisher

American Institute of Physics

Publication Date

2008

Rights Information

Copyright 2008

Rights Holder

American Institute of Physics

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figure1.zip (42 kB)
Figure 1 - high resolution image

figure2.zip (1512 kB)
Figure 2- high resolution image

figure3.zip (1347 kB)
Figure 3 - high resolution image

figure4.zip (1719 kB)
Figure 4 - high resolution image

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