Nanowire Optical Cavities by Fermi Liquid Pseudo-Mirror

Surface plasmon Polaritons (SPPs) are density oscillations of electrons at the surface of a dielectric. Materials such as noble metals including Au and Ag are considered as the most promising plasmonic material candidates because of their high optical conductivity and low ohmic loss. A heterojunction is the interface that occurs between two layers or regions of dissimilar crystalline semiconductors with unequal bandgaps which provides a mature system of extremely high mobility electrons. At the interface of the core-shell nanowires, a heterostructure can be formed which results in 6 sheets of 2D and 6 pillars of 1D charge, forming the plasmonic boundary of the optical cavity. This method can produce better optical cavity quality factor, as well as enhance emission and absorption of radiation. A comparison among this plasmonic medium and noble metallic surfaces is conducted to show that 2DEG at the interface has similar effects as the well-known plasmas. Plasmonic resonant modes in sub-wavelength geometries in CSNWs can be used in THz nanowire laser applications. Additionally, control of charge density leads to design of tunable nanowire cavities.