Non-Hermitian PT-symmetric bilayer meta-gratings produce amplified beams with large, sign-flipping Goos-Hänchen shifts near lasing threshold modes whose shifts scale with the reciprocal of the mode's imaginary frequency part.
Artmann, Berechnung der Seitenversetzung des total- reflektierten Strahles, Ann
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Optical Amplification with Large Goos-H$\ddot{a}$nchen Shift Driven by Non-Hermitian Bilayer Meta-Grating
Non-Hermitian PT-symmetric bilayer meta-gratings produce amplified beams with large, sign-flipping Goos-Hänchen shifts near lasing threshold modes whose shifts scale with the reciprocal of the mode's imaginary frequency part.