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Vol. 13, Special Issue, December 2011, pp.109-116

 

Bullet

 

Carbon Nanomaterials for Optical Absorber Applications

 

1 Anupama KAUL, 1 James COLES, 1 Krikor MEGERIAN, 1 Michael EASTWOOD, 1 Robert GREEN, 1 Thomas PAGANO,
2 Prabhakar BANDARU and 3 Mehmet DOKMECI

1 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA

2 Jacobs School of Engineering, University of California-San Diego, La Jolla, CA 92093, USA

3 Department of Electrical and Computer Engineering, Northeastern University, Boston, MA 02115, USA

E-mail: Anupama.B.Kaul@jpl.nasa.gov

 

 

Received: 29 June 2011   /Accepted: 16 November 2011   /Published: 28 December 2011

 

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Abstract: Optical absorbers based on vertically aligned multi-walled carbon nanotubes (MWCNTs), synthesized using electric-field assisted growth, are described here that show an ultra-low reflectance, 100X lower compared to the benchmark, a diffuse metal black - Au-black - from wavelength l ~ 350 nm 2500 nm. The reflectance of the MWCNT arrays was measured to be as low as 0.02 % at 2 mm in the infra-red (IR). Growth conditions were optimized for the realization of high-areal density arrays of MWCNTs using a plasma-based chemical vapor deposition (CVD) process. Such high efficiency absorbers are particularly attractive for radiometry, as well as energy harnessing applications. Optical modeling calculations were conducted that enabled a determination of the extinction coefficient in the films.

 

Keywords: Carbon nanomaterials, Optical absorbers, Nanoabsorbers, MWCNTs, PECVD

 

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