arXiv subjects

Bhanu P. Singh

Publications and source records attributed to Bhanu P. Singh.

2 recordsLinked to original sources

arXiv2026

Polarimetric Backscattering Setup for Quantitative Scattering Parameters Retrieval

We present two backscattering polarimetric scanning setups based on point-illumination schemes, that are designed to probe the optical properties of subsurface media. We describe their advantages and limitations, characterize their performance in Mueller matrix determination, and demonstrate their ability to retrieve unknown sample parameters (such as the scattering coefficient and anisotropy factor) using a maximum likelihood approach. As an experimental validation, a polystyrene suspension is investigated as a representative case. By applying Fisher information formalism on the theoretical model, we estimate boundaries of the retrieved parameters.

physics.optics↗

arXiv2004

Size-enhanced, coherent photoluminescence from CdS-ZnO nanocomposite thin film

We show that the photoluminescence emitted from a dense, two-component ensemble of quantum dots is significantly higher than that from quantum dots of either of the two pure systems (CdS and ZnO). The semiconductor nanocomposite, in which the characteristic grain size of each species was 2-3 nm, was deposited directly on Si wafers by high-pressure magnetron sputtering. It exhibits a single, relatively sharp optical absorption edge. Further, using the classical Young's double slit experiment we show - possibly for the first time - that the emitted photoluminescence has significant spatio-temporal coherence, a fact that would be crucial for their use in quantum information processing as well as for lasing action from light-emitting particles.

cond-mat.mes-hall↗