PLASMONIC WAVEGUIDE BASED ALL OPTICAL LOGIC GATES

Abstract

Plasmonics is a recent involving very interesting subfield of nanophotonics that plays with the interaction of light with surface plasmons, surface plasmons are the collective charge oscillations that occur at the interface between a metal-dielectric interfaces, such as a metal sheet in air. Plasmonics fulfill requirement in optical interconnects that are small enough to coexists with nano scale electronic circuits. Nowadays many researchers are try to using plasmonincs in many optical application because in case of plasmonic devices electromagnetic waves can be confined in dimensions much smaller than the wavelength of opertion. In this thesis, design of plasmonic waveguides based various optical logic gates have been proposed. Various designs of Photonic crystal based optical logic gates have already been envisioned and proposed during the past decade, in which, wavelength of operation is comparable to the geometrical parameters. On the contrary, the proposed structure consists of plasmonic waveguides whose thickness is much smaller than the wavelength of operation. This may pave the way for large scale integration for the development of all optical circuits for optical computing systems. Moreover, the proposed design is simple and easy to fabricate using techniques like thin-film technology and lithography. For analysis of plasmonic waveguides, various numerical techniques have been used to reveal the dispersion properties of supported modes. The rest of the thesis deals with the design and analysis of waveguide based all optical plasmonic gates, for which, magnetic field distribution has been obtained for each device. Moreover, by calculating the relative power levels at the input and output ports, the truth tables have been as well