Abstract
The spatial Goos–Hänchen (GH) shifts at the reflection boundary are studied in a non-Hermitian dielectric slab sandwiched by graphene. The reflected light could be greatly enhanced with the existing of graphene and can be further improved by modulating the gain and loss in the slab. Weak loss in graphene induces a sharp phase change of the reflection coefficient and giant spatial GH shifts are realized near the zero reflection point. Furthermore, the reflectivity of resonant states has also been improved significantly by regulating the permittivity of slab and the spatial GH shift can be as large as 108λ. The study may be utilized for highly sensitive permittivity sensors.
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