PT-symmetry breaking and laser-absorber modes in optical scattering systems

Details PT-symmetry breaking and laser-absorber modes in optical scattering systems PT-symmetry breaking and laser-absorber modes in optical scattering systems

2010-08-30

arxiv.org/abs/1008.5156v3

Phys. Rev. Lett. 106, 093902 (2011)

Physics

Optics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.106.093902

Using a scattering matrix formalism, we derive the general scattering properties of optical structures that are symmetric under a combination of parity and time-reversal (PT). We demonstrate the existence of a transition beween PT-symmetric scattering eigenstates, which are norm-preserving, and symmetry-broken pairs of eigenstates exhibiting net amplification and loss. The system proposed by Longhi, which can act simultaneously as a laser and coherent perfect absorber, occurs at discrete points in the broken symmetry phase, when a pole and zero of the S-matrix coincide.

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