1. Introduction
Optical and optoelectronics devices and components play a significant role in the everyday life of modern society. Devices are being constantly improved and developed to assist solving the most urgent problems of world-wide society such as its safety, information exchange, dealing with global warming, and the diagnosis and treatment of diseases. Many of these technological advances are being enabled by advances in fabrication technology on the sub-wavelength-scale that are offering both components of significantly superior performance to meet existing system requirements, for example filters, or completely new capabilities, for example integrated optical memory. The integration of a large number of photonic devices on a single platform makes the problem of analysis, understanding and prediction of the behaviour of the full circuit an increasingly difficult task. The demand is to include a wide range of material properties and a detailed description of structure geometries into the design process to maximize the interplay of all physical phenomena used.