Active parity-time symmetric and exceptional point structures

초록

We discuss recent progress on active parity-time symmetric plasmonic systems. We discuss interactions based on encircling-an-exceptional-point, which are reciprocal in the linear regime, but become nonreciprocal in the nonlinear regime over a very broad optical bandwidth. We present an implementation based on plasmonic waveguides incorporating an IR140-doped PMMA gain medium.