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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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
Divisions: Div B > Electronics, Power & Energy Conversion
Div B > Photonics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:01
Last Modified: 18 Feb 2021 15:33
DOI: 10.1016/j.photonics.2012.04.003