my research is on absorption and emission properties of gold thin films in the form of nano-island on glass substrate under various situation such thickness annealing effects and so on. i want to find an theoretical physical model for absorption and emission property. but I don't know which model is coincide with my experimental results?
Look at early articles from Vlad Shalaev on percolation/pre-percolation regimes.
Absorption Spectroscopy refers to methods that measure amount of radiation absorbed by a sample it interacts with. It is a function of the frequency or wavelength of the radiation. This occurs for a whole set of frequencies, we refer to as a spectrum.
In biological applications, very few materials are chemically inert, gold , silver, copper, platinum are among the few candidates. Gold makes a good choice, it has high plasma field around it when it receives optical energy.
'Nano' refers to the very small size: 10-9 metres(m) - 0.000 000 001m.
There are several models but the Quantum mechanical model explains uniquely the absorption spectra of molecules in terms of atomic and molecular mass, electronic structure and geometry.
The absorption spectrum is determined by the extInction coefficient. Extinction and index coefficients are related through the KRAMERS-KRONIG relation. Therefore, the absorption spectrum can be derived from a reflection or scattering spectrum which may require a model to simplify it, the derived absorption spectrum which is an approximation may be also be used.
you need to calculate the electronic structure for your nanostructures by several methods:
a software like COMSOL can perform this kind of calculation
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