Abstract
In this work, we study the transmission properties of one-dimensional finite periodic systems with symmetry. A simple closed-form expression is obtained for the total transmittance from a lattice of cells, that allows us to describe the transmission minima (maxima) when the system is in the -unbroken (broken) phase. Utilizing this expression, we provide the necessary conditions, independent of the number of cells, for the occurrence of a coherent perfect absorber and laser for any finite -symmetric periodic potential. Under these conditions, we provide a recipe for building finite periodic structures with near perfect absorption and extremely large amplification.
- Received 23 March 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.243904
© 2017 American Physical Society