THz bandwidth optical switching with carbon nanotube metamaterial
Nikolaenko, Andrey E., Papasimakis, Nikitas, Chipouline, Arkadi, De Angelis, Francesco, Di Fabrizio, Enzo and Zheludev, Nikolay I. (2012) THz bandwidth optical switching with carbon nanotube metamaterial. Optics Express, 20, (6), 6068-6079. (doi:10.1364/OE.20.006068).
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We provide the first demonstration of exceptional light-with light optical switching performance of a carbon nanotube metamaterial - a hybrid nanostructure of a plasmonic metamaterial with semiconducting single-walled carbon nanotubes. A modulation depth of 10% in the near-IR with sub-500 fs response time is achieved with a pump fluence of just 10 μJ/cm2, which is an order of magnitude lower than in previously reported artificial nanostructures. The improved switching characteristics of the carbon nanotube metamaterial are defined by an excitonic nonlinearity of carbon nanotubes resonantly enhanced by a concentration of local fields in the metamaterial. Since the spectral position of the excitonic response and metamaterial plasmonic resonance can be adjusted by using carbon nanotubes of different diameter and scaling of the metamaterial design, the giant nonlinear response of the hybrid metamaterial - in principle - can be engineered to cover the entire second and third telecom windows, from O- to U-band.
|Digital Object Identifier (DOI):||doi:10.1364/OE.20.006068|
|Subjects:||Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
|Divisions:||Faculty of Physical Sciences and Engineering > Optoelectronics Research Centre
|Date Deposited:||28 Mar 2012 10:41|
|Last Modified:||14 Apr 2014 11:38|
NANOSTRUCTURED PHOTONIC METAMATERIALS
Funded by: EPSRC (EP/G060363/1)
Led by: Nikolay Zheludev
1 January 2010 to 31 December 2015
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