Cylindrical Fresnel lenses based on carbon nanotube forests

Haider Butt; Ranjith Rajesekharan; Qing Dai; Sohab Sarfraz; R. Vasant Kumar; Gehan A J Amaratunga; Timothy D. Wilkinson; Haider Butt

doi:10.1063/1.4772002

Cylindrical Fresnel lenses based on carbon nanotube forests

Haider Butt^*, Ranjith Rajesekharan, Qing Dai, Sohab Sarfraz, R. Vasant Kumar, Gehan A J Amaratunga, Timothy D. Wilkinson, Haider Butt

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

The forests of carbon nanotubes have been termed as the darkest man-made materials. Such materials exhibit near-perfect optical absorption (reflectance∼0.045%) due to low reflectance and nanoscale surface roughness. We have demonstrated the utilization of these perfectly absorbing forests to produce binary amplitude cylindrical Fresnel lenses. The opaque Fresnel zones are defined by the dark nanotube forests and these lenses display efficient focusing performance at optical wavelengths. Lensing performance was analyzed both computationally and experimentally with good agreement. Such nanostructure based lenses have many potential applications in devices like photovoltaic solar cells.

Original language	English
Article number	243116
Journal	Applied Physics Letters
Volume	101
Issue number	24
DOIs	https://doi.org/10.1063/1.4772002
Publication status	Published - 10 Dec 2012

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4772002

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abstract = "The forests of carbon nanotubes have been termed as the darkest man-made materials. Such materials exhibit near-perfect optical absorption (reflectance∼0.045%) due to low reflectance and nanoscale surface roughness. We have demonstrated the utilization of these perfectly absorbing forests to produce binary amplitude cylindrical Fresnel lenses. The opaque Fresnel zones are defined by the dark nanotube forests and these lenses display efficient focusing performance at optical wavelengths. Lensing performance was analyzed both computationally and experimentally with good agreement. Such nanostructure based lenses have many potential applications in devices like photovoltaic solar cells.",

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AU - Butt, Haider

AU - Rajesekharan, Ranjith

AU - Dai, Qing

AU - Sarfraz, Sohab

AU - Vasant Kumar, R.

AU - Amaratunga, Gehan A J

AU - Wilkinson, Timothy D.

AU - Butt, Haider

PY - 2012/12/10

Y1 - 2012/12/10

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AB - The forests of carbon nanotubes have been termed as the darkest man-made materials. Such materials exhibit near-perfect optical absorption (reflectance∼0.045%) due to low reflectance and nanoscale surface roughness. We have demonstrated the utilization of these perfectly absorbing forests to produce binary amplitude cylindrical Fresnel lenses. The opaque Fresnel zones are defined by the dark nanotube forests and these lenses display efficient focusing performance at optical wavelengths. Lensing performance was analyzed both computationally and experimentally with good agreement. Such nanostructure based lenses have many potential applications in devices like photovoltaic solar cells.

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JO - Applied Physics Letters

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Cylindrical Fresnel lenses based on carbon nanotube forests

Abstract

ASJC Scopus subject areas

UN SDGs

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