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A modified Drude-Born-Fedorov model for isotropic chiral media, obtained by finite scale homogenization

Isotropic chiral media can be modeled in several ways. We show that when realizing such a medium from spiral inclusions with real permittivities and permeabilities in a periodic structure, a modified Drude-Born-Fedorov model is obtained. This model equals the original Born model for small wave vectors, but the strength of the chirality depends on the propagation direction. The effective parameters

Coexistence of gain and absorption

Scattering not only broadens the width of the optical transition between two levels but can enable optical gain and absorption to coexist — a fact that is unambiguously demonstrated by the observation of 'Bloch gain' in a quantum cascade laser.

Anti-Dumping Law of WTO/GATT and EC: Gradual Evolution of Anti-Dumping Law in Global Economic Integration

The aim of this study is to demonstrate and evaluate the current anti-dumping law as formed by the WTO/GATT law (GATT law) and implemented by the EC law against the background of global economic integration. Over centuries, international trade has involved a controversial business behaviour, “dumping”. Roughly speaking, a product is considered to be dumped if it is sold at a lower price abroad tha

Photon Upconversion in Heavily Doped Semiconductors

Popular Abstract in English Imagine a solar powered flash light. Each photon absorbed by the flash light’s solar cell creates electric energy and the flash light’s light source converts the electrical energy again into photons. The purpose of such a device may be questionable, because you would be surprised if it would create more light than what it absorbs. However, under certain conditions it isIn this thesis the luminescence properties of highly doped semiconductors are studied with focus on degenerately n-doped InP. It is demonstrated how photoluminescence measurements on degenerately doped semiconductors allow an estimation of the doping concentration without need for electrical contacts. The degenerate doping can furthermore reveal the conduction band structure for energies higher th