Using the transmittance data other optical quantities were obtained by a numerical approximation method.
These calculated optical quantities are adequate in estimating the time-to-contact a point N on the obstacle.
Therefore, such an approach is able to provide inverse methods to obtain the actual values of physical parameters from definite features of optical quantities.
Different optical quantities, such as optical band gap, refractive index and extinction coefficient, were determined in this article for different molarities (from 0.10 M to 0.25 M) at two specific substrate temperatures (250 °C and 500 °C).
Then, after characterizing wavelength ranges and optical quantities which are sensitive to one of the parameters and not the others, one should be able to build inverse-method tools for grain radius and refractive index determination from observational data.
In this case there is no need to measure the phase shift spectra since the pairs of optical quantities of the sample can be calculated from the transmission coefficient spectrum alone: the absorptive part (like ε′ or σ1) is determined from the interferometric maxima amplitudes and the refractive part (like ε ′ or n) is calculated from their positions[20, 21].
Despite its success, the interpretation of EELS data in terms of optical quantities, such as the photonic local density of states (LDOS), remains challenging.
Ellipsometric optical quantities were detected by acquiring spectra at incidence angles of 55, 60, and 65° in wavelengths ranging from 300 to 1800 nm.
Electron energy loss spectroscopy (EELS) has emerged as a powerful tool for the investigation of plasmonic nanoparticles, but the interpretation of EELS results in terms of optical quantities, such as the photonic local density of states, remains challenging.
To inversely reconstruct an embedded object within tissue by DOT, namely, to identify localized heterogeneities within a homogenous medium, theoretical approaches are needed so that the measured optical quantities can be associated with the heterogeneities that perturb the homogeneous background.
