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Abstract.The linear properties of the angular gap in a one-dimensional photonic band gap structure containing single negative material layers are investigated. This gap forms at oblique incidence due to total internal reflection into the air when the Snell's law breaks down and its lower edge occurs at the frequency where the refractive index of one or both layers of the structure approaches zero. This gap is found to be highly sensitive to the incident angle and the polarization of light, but is not affected by thickness ratio of the layers. It is also shown that the electric field is extremely enhanced at the low frequency edge of this gap for TM polarization. This highly enhanced electric field can be used for certain applications.

Nodes in an ad hoc grid are characterized by heterogeneity, autonomy, and volatility. These characteristics result in varying workload of the resource manager in the ad hoc grid. Therefore it is required to develop a resource allocation mechanism that can balance the workload of the resource manager, hereafter referred to as matchmaker, and can enable the ad hoc grid to self-organize itself. In this paper, we define a mechanism that dynamically promotes and demotes nodes as matchmaker(s) and matchmakers back to the normal nodes in an ad hoc grid environment. The proposed mechanism uses the matchmaker workload as the basic criterion for promotion and demotion of the matchmaker(s). Simulation results show that our approach performs better than previously proposed solutions.

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