IBM researchers managed to develop a graphene insulator superlattice that achieves a Teraherz frequency notch filter and a linear polarizer. These kinds of devices can be used in mid- and far-infrared photonic devices, including detectors, modulators and three-dimensional metamaterials. Terhertz is interesting because this kind of frequencies can penetrate paper, wood and other solid objects.
IBM managed to create these devices by using a multi-layer graphene/instulator superlattice and a multi-layer stack structure in microdisk arrays.
Posted: Apr 23,2012 by Ron Mertens