Hot spots in circular and rectangular holes of plane-parallel dielectric resonators

Hot spots are areas of local electromagnetic field enhancement that can be generated in submicron regions between two or more closely spaced metal or dielectric resonators. In this paper, we change the strategy of studying hot spots, demonstrating their occurrence inside dielectric resonators in extremely small air holes. The transformation and disappearance of the hotspot is analyzed when the hole size increases to macroscopic values. Two cases are considered: hot spots in circular and rectangular holes of plane-parallel dielectric resonators.