About project

GraTer 

Graphene Based Terahertz Waveguide and Modulator (GraTer) is a 3 year personal postdoc project implemented by Andrei Andryieuski. It received the financial support from the Danish Counsil for Technical and Production Sciences for 2012-2014.

The goal of the project is to simulate and design, fabricate and characterize the graphene based waveguide, modulator and antenna for the terahertz range (0.1-30 THz).

Terahertz science and technology has a lot of current and potential applications for security (weapon and drug detection), biomedical imaging, chemical analysis, spectroscopy and wireless communication. However, since the terahertz field is relatively young (about 20 years old) efficient waveguides, modulators, sources and detectors are on demand.

The GraTer project is focused on the graphene usage for terahertz technology. Graphene, a one-atom-thick material, received a tremendous attention of the scientific community after the Nobel Prize 2010 given for its discovery. Graphene possesses exceptional and striking properties. For example, it has extremely high charges mobility, it is transparent to electromagnetic waves, but provides ultrahigh conductivity. Graphene opens plenty of possibilities for applications in high-speed consumer electronics, biosensors, displays, photonic circuits, solar cells, nanoelectromechanical devices.

The physical background of the GraTer project lies the exploitation of THz surface plasmon waves. The unique property of the graphene SPPs is that their wavelength is up to 100 times less than the THz wavelength in vacuum. Such SPPs allow strong THz wave confinement and larger propagation length in comparison with the metallic waveguides. Being a zero-gap semiconductor with a conical band structure graphene also allows ultrafast tuning of its electrical and optical properties by changing the chemical potential (for example, by applying voltage to the gate electrode or by chemical doping) and thus allowing or prohibiting the propagation of plasmons. That makes graphene suitable for electromagnetic waves modulation and switching. 

Application of graphene based waveguides and modulators can result in compact medical imaging devices (e.g. endoscope for cancer tumor detection) and efficient THz photonic circuits for communication and information processing.