CUED Publications database

Negative index photonic crystal lenses based on carbon nanotube arrays

Butt, H and Dai, Q and Wilkinson, TD and Amaratunga, GAJ (2012) Negative index photonic crystal lenses based on carbon nanotube arrays. Photonics and Nanostructures - Fundamentals and Applications, 10. pp. 499-505. ISSN 1569-4410

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Abstract

We report a novel utilization of periodic arrays of carbon nanotubes in the realization of diffractive photonic crystal lenses. Carbon nanotube arrays with nanoscale dimensions (lattice constant 400 nm and tube radius 50 nm) displayed a negative refractive index in the optical regime where the wavelength is of the order of array spacing. A detailed computational analysis of band gaps and optical transmission through the nanotubes based planar, convex and concave shaped lenses was performed. Due to the negative-index these lenses behaved in an opposite fashion compared to their conventional counter parts. A plano-concave lens was established and numerically tested, displaying ultra-small focal length of 1.5 μm (∼2.3 λ) and a near diffraction-limited spot size of 400 nm (∼0.61 λ). © 2012 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Multiwalled carbon nanotube arrays Negative index Negative refraction Photonic crystals Photonic lenses
Subjects: UNSPECIFIED
Divisions: Div B > Photonics
Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:08
Last Modified: 08 Dec 2014 02:37
DOI: 10.1016/j.photonics.2012.04.003