Goos–Hänchen shift at an interface of a composite material: effects of particulate clustering
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- Chen, C.W., Gu, Y.W., Chiang, H. et al. Appl. Phys. B (2011) 104: 647. doi:10.1007/s00340-011-4460-0
The Goos–Hänchen (GH) shift of a p-polarized light beam reflected from an interface of a composite material of particulate metals in a dielectric host is studied theoretically using effective medium approaches, with focus on the effects due to the clustering of the metal particles. With application of a fractal-clustering model, it is shown that the composite can have optically metallic behavior even for relatively low volume fraction of metal when clustering takes place, with appreciable negative GH shifts to take place for light of long wavelengths close to grazing incident angles. Furthermore, we confirm that large reflectance is always accompanied with this metal behavior, thus rendering these shifts easily observable.