Spectrally selective filters with rough surfaces and multilayer coatings

Official URL: https://risc01.sabanciuniv.edu/record=b2811513_(Table of contents)

Due to the energy crisis and major environmental concerns, new energy sources are being researched for environmentally friendly and efficient energy conversion and consumption techniques. Optical surfaces, which have shown remarkable promise and are presently being applied globally, are among of the promising technologies for energy management. The reflectance, absorption, and transmission characteristics of an object are determined by the material and structural parameters of the object. Impact of surface texture on optical performance of the surface is unavoidable. In order to alter the spectral features (transmission, reflection, and absorption) of light, light-matter interactions can be altered by multilayer coatings, nanostructures, and rough surfaces. As a result, design of micro and nano structures that can act as spectrally selective filters for reflection and emission over a broadband spectrum became an important consideration. The purpose of this thesis is to provide design methodologies for spectral selective emission surfaces with various applications, such as spectrally selective filters with rough surfaces and multilayer coatings, colored radiative cooling, and absorption mechanism of black silicon, which in all of them it is required to do surface engineering to do spectrally selective in both broadband and narrowband. Various aspects are evaluated throughout the designing process and used to assess the generated characteristics. The methods utilized in this thesis create innovative designs that may be used in a variety of applications.