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Optical spectral singularities as threshold resonances

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Spectral singularities are among generic mathematical features of complex scattering potentials. Physically they correspond to scattering states that behave like zero-width resonances. For a simple optical system, we show that a spectral singularity appears whenever the gain coefficient coincides with its threshold value and other parameters of the system are selected properly. We explore a concrete realization of spectral singularities for a typical semiconductor gain medium and propose a method of constructing a tunable laser that operates at threshold gain.

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American Physical Society (APS)

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Optics, Physics

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Physical Review A

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10.1103/PhysRevA.83.045801

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