We have computed effective specific absorption rate (SAR) and change in the temperature for a four-layered human-head model when exposed to electromagnetic radiations from a common antenna in mobile phones. Human head is modeled as having four layers of skin, fat, bone, and brain. A realistically shaped human-head model is used in contrast to an oval-shaped model. The SAR and change in temperature is computed as a function of the distance of the antenna from the head at 900 and 1200 MHz. It was found that increasing the distance of the antenna from the head from 1 to 2 cm can significantly decrease the absorbed power in different tissues.
We recently formulated the canonical boundary-value problem of propagation of surface plasmon-polariton (SPP) waves along the direction of periodicity of a one-dimensional photonic crystal. Here we present the general formulation of that canonical problem supporting the oblique propagation of SPP waves in the interface plane. The general dispersion equation has been obtained using the rigorous coupled-wave approach (RCWA) for the oblique propagation and numerically solved using the Muller’s method. The RCWA formulation is developed for the general eigenvalue problem solved here. A periodicity in the wavenumbers of the SPP waves was observed. Furthermore, the regions of high losses for the SPP waves, dubbed as plasmonic bandgaps, were observed in the photonic band diagram of the SPP waves. These plasmonic badngaps can be used to construct optical filters for the SPP waves.
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