June 6, 2011
Singapore Researchers Invent Broadband Graphene Polarizer
Researchers at the National University of Singapore have invented a graphene-based polarizer that can broaden the bandwidth of prevailing optical fiber-based telecommunication systems
Researchers at the National University of Singapore have invented a graphene-based polarizer that can broaden the bandwidth of prevailing optical fibre-based telecommunication systems.
In principle, the polarizing ability of graphene covers the telecommunication bands from visible to mid-infrared. This means that graphene polarizer can provide all-in-one solution for multiple-channel high-speed optical communications, the researchers said.
The researchers skilfully transferred graphene grown by chemical vapour deposition on the side-polished optical fibre to fabricate the graphene polarizer and measured light polarization at different wavelengths. Unlike polarizers made from thin metal film or semiconductor dielectric, a graphene polarizer has the unique ability to filter out transverse-magnetic-mode and supports transverse-electric-mode surface wave propagation.
The broadband graphene polarizer work was published in the journal Nature Photonics and appeared online on 29 May 2011. Source: http://www.nature.com/nphoton/journal/vaop/ncurrent/full/nphoton.2011.102.html
"The results reported in this paper can have a strong impact in the development of graphene-based optical devices for photonic applications"¦the science behind it is excellent"¦" says professor Antonio Castro Neto of National University of Singapore.
The Singapore team has earlier pioneered graphene mode-locked lasers in 2009. This work was another breakthrough in bringing graphene photonics a step closer to real applications.
"In the near future, we can envision ultrathin graphene-based photonic circuits with multiple functions of light creation, routing, modulation or detection," said Dr. Qiaoliang Bao, who is the project leader of the pioneering work.
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