arXiv subjects

F. Ghafoor

Publications and source records attributed to F. Ghafoor.

2 recordsLinked to original sources

arXiv2016

Triplet absorption spectroscopy and electromagnetically induced transparency

Coherence phenomena in four-level atomic system, cyclicly driven by three coherent fields, are investigated thoroughly at zero and weak magnetic fields. Each strongly interacting atomic state is converted to a triplet due to a dynamical Stark effect. Two dark lines with a Fano-like profile are arising in the triplet absorption spectrum with anomalous dispersions. We provide the conditions to control the widths of the transparency windows by means of the relative phase of the driving fields and the intensity of the microwave field, that closes the optical system loop. The effect of the Doppler broadening on results of the triplet absorption spectroscopy is analysed in detail.

physics.optics↗

arXiv2011

Linear and non-linear optical response of Mg(x)Zn(1-x)O: A Density Functional study

Total and partial density of states, frequency dependent complex refractive index including extinction coefficient, optical conductivity and transmission of MgxZn1-xO (0 \leq x \leq 1) in rocksalt and wurtzite phases are calculated using full potential linearized augmented plane wave (FP-LAPW) method. The real part of refractive index decreases while the extinction coefficient, optical conductivity and transmission for rocksalt phase increases with the increase in Mg concentration. In wurtzite phase, ordinary and extraordinary indices decreases while extinction coefficient, optical conductivity and transmission increases in parallel as well as perpendicular to c-axis with the increase in the Mg concentration.

cond-mat.mtrl-sci↗