Department of Electrical Engineering at Drexel University

Research

Nanowires are shown to work as optical cavities without the need for vertical structures. Plasmons which are charge density waves affect the properties of the cavity by enhancing the light confinement and emission and absorption. Here we show that confined charge plasma has similar effects as of metals and Graphene on optical properties of the nanowires.

  • Materials with free electrons and high conductivity and low loss like metals and Graphene have been shown to be a suitable plasma for optical cavities.
  • Relaxation time and plasma frequency of the plasmonic materials are the important factors for choosing the medium.
  • Relatively dense 2D electron gas is yet to be shown in here to be a promising material for plasmonically modified cavities.
  • Confined electron gas offers a mature system of extremely high mobility electrons, especially at low temperatures.
  • In hexagonal CSNWs, this results in 6 sheets of 2D charge and 6 pillars of 1D charge.

 

We have simulated the plasmonic effects of the embedded low dimensional electron gas in CSNWs. Plasmonically modified nanowires have been shown to enhance light confinement, improve emission and absorption and radiation in nanowire lasers. Moreover, the effects of electron injection  can be used in tunable nanowire cavities. Additionally, plasmonic resonant modes in sub-wavelength geometries in CSNWs can be used in THz nanowire laser applications.