Design, Fabrication and Characterization of Polymer-based Parity-Time Symmetric Materials and Structures
Master of Science
This study presents the investigation of polymer-based one dimensional (1D), two dimensional (2D) and three dimensional (3D) materials and structures with unidirectional light propagation and Parity-Time symmetry breaking. We propose organic dye-doped/backfilled gain and loss periodic structures and devices which show great potential for unusual optic behaviors. The 2D and 3D systems were fabricated by photolithography and backfilled with dyes, and characterized with a pump-probe. The proposed1D polymer-based gain and loss parallel structures are studied by theoretical simulation and experimental fabrication/characterization. The gain and loss medium is modulated by concentration variation and baking process. A fiber-coupler integrated pump-probe setup was built for characterization of this core/clad (dye doped)/core waveguide. Theoretical simulation shows Parity-Time symmetry breaking above a critical point, and exhibiting unidirectional behavior in this single waveguide. This is the first time Parity-Time symmetry breaking has been investigated in a polymer-based system.
PT Symmetry; Gain/Loss Modulation; Waveguide