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Jinsik MOK, Hyoung-In LEE; Poynting Vector of Electromagnetic Waves in Media of Inhomogeneous Refractive Index; Advanced NanoMaterials and Technologies for Energy Sector; 2017:1(1): 34-38
Poynting vector is a key property of electromagnetic waves as an energy-flow vector. Poynting vector in spatially uniform dielectric media is well known in an analytic form. In general, Poynting vector can be decomposed into orbital and spin parts. One way of controlling the direction of Poynting vector is to impose external potential onto the media under consideration. We are here to derive analytic expression of Poynting vector in the presence of spatially inhomogeneous refractive index, which serves as such a potential. For realizing proper profiles of refractive index, thermos-optic effect is proposed and the resulting alteration in the expression for Poynting vector is discussed.