Abstract

We study the Goos–Hänchen shift (GHS) in the reflected light (RL) by considering a one-dimensional double-layered structure. The double-layered structure consists of dielectric slabs having gain-loss properties. A Gaussian beam is incident on a double-layered structure, making an angle $\theta$ with the $z$ axis. Positive GHSs in the RL are investigated for different incident angles when both the layers have gain properties. Similarly, negative GHSs in the RL are investigated for different incident angles by considering loss in both layers. By considering the gain in one layer and equal amount of loss in another, we achieved a giant negative GHS in the RL. Interestingly, we develop the connection of magnitude of the GHS and light beam propagation through the medium and show that the magnitude of the GHS in the RL depends on the light beam propagation through the medium. Giant negative GHSs in the RL are achieved for a Gaussian beam that propagates more into the medium. The greater the penetration of an incident beam in the medium, the greater the magnitude of the GHS in the RL and vice versa.

© 2018 Optical Society of America

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