| After realizing the surprising fact that PT-symmetric Hamiltonians can exhibit entirely real spectra, intense studies have extend the framework of quantum mechanics into the complex domain creating a new research area, that of PT-quantum mechanics. Quite recently however, it was proposed that the concept of PT-symmetry could be physically implemented within the context of classical optics. This proposal has, in turn, stimulated extensive investigations and research studies related to PT-symmetric optics, where the first experimental observation (in any physical system) of parity-time symmetry breaking has been demonstrated. In this paper, we present recent results regarding PT-symmetric optics. |
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