Theory of coupled optical PT-symmetric structures.

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Rational and Semirational Solutions of the Nonlocal Davey–Stewartson Equations (2017, methodology): “This concept has since been applied to optics [6,7], Bose-Einstein condensation [8], electric circuits [9], mechanical systems [10], magnetics [11] and other settings.”
Light fields in complex media: Mesoscopic scattering meets wave control (2017, background): “Such a laser-absorber (or CPA-laser) can be realized based on the concept of 𝒫𝒯 -symmetric optical systems (Bender and Boettcher, 1998; El-Ganainy et al., 2007; Makris et al., 2008; Rüter et al., 2010) in which gain and loss are carefully balanced and poles and zeros of the scattering matrix can…”
Loss-induced suppression and revival of lasing (2014, background): “can control the flow of light in optical devices withboth loss and gain. In particular, waveguides having parity-time symmetry (8), where loss and gain are balanced, have attracted enormous attention (9,10), with effects such as loss-induced transparency (11), unidirectional invisibility (12), and r”
PT symmetry in a fractional Schrödinger equation (2016, background): “There, the real part of the complex potential corresponds to an even change in the refractive index, whereas the imaginary part indicates alternatively changing loss and gain with equal amplitudes [3].”