arXiv subjects

Francesco Scotognella

Publications and source records attributed to Francesco Scotognella.

57 records · Page 4Linked to original sources

arXiv2011

Threshold behaviour in Light Reflection Tuning the Disorder in Photonic Media

The optical properties of materials are strongly influenced by disorder. Control of disorder in photonic materials can unveil interesting optical properties. We have found an engineered photonic structure for which the average light reflection shows a linear behaviour with a slope change in a broad range of wavelengths. Such change in slope is due to a specific degree of disorder, which is quantified by the Shannon index.

physics.optics↗

arXiv2011

Light transmission behaviour as a function of the homogeneity in one dimensional photonic crystals

The average light transmission of one-dimensional photonic media has been studied as a function of the medium homogeneity, quantified by the Shannon-Wiener index. We have found a decrease in the average light transmission by increasing the Shannon-Wiener index up to minimum (corresponding to H'=0.9375): from this point, the transmission increases following the Shannon-Wiener index. The behaviour has been confirmed for different pairs of materials forming the photonic structure. Nevertheless, we have observed that the trend slope is proportional to the refractive index ratio between the two materials (nhi/nlow).

physics.optics↗

arXiv2010

Transmission of Light in Crystals with different homogeneity: Using Shannon Index in Photonic Media

Light transmission in inhomogeneous photonic media is strongly influenced by the distribution of the diffractive elements in the medium. Here it is shown theoretically that, in a pillar photonic crystal structure, light transmission and homogeneity of the pillar distribution are correlated by a simple linear law once the grade of homogeneity of the photonic structure is measured by the Shannon index, widely employed in statistics, ecology and information entropy. The statistical analysis shows that the transmission of light in such media depends linearly from their homogeneity: the more is homogeneous the structure, the more is the light transmitted. With the found linear relationship it is possible to predict the transmission of light in random photonic structures. The result can be useful for the study of electron transport in solids, since the similarity with light in photonic media, but also for the engineering of scattering layers for the entrapping of light to be coupled with photovoltaic devices.

physics.optics↗