Temperature Dependence of Coherent versus Spontaneous Raman Scattering.

Because of their sub picosecond temporal resolution, coherent Raman spectroscopies have been proposed as a viable extension of spontaneous Raman thermometry, to determine dynamics of mode specific vibrational energy content during out of equilibrium molecular processes. Here we show that the presence of multiple laser fields stimulating the vibrational coherences introduces additional quantum pathways, resulting in destructive interference. This ultimately reduces the thermal sensitivity of single spectral lines, nullifying it for harmonic vibrations and temperature independent polarizability.

Wafer-scale silver nanodendrites with homogeneous distribution of gold nanoparticles for biomolecules detection.

We report the fabrication and demonstrate the superior performance of robust, cost-effective, and biocompatible hierarchical Au nanoparticles (AuNPs) decorated Ag nanodendrites (AgNDs) on a Silicon platform for the trace-level detection of antibiotics (penicillin, kanamycin, and ampicillin) and DNA bases (adenine, cytosine). The hot-spot density dependence studies were explored by varying the AuNPs deposition time. These substrates' potential and versatility were explored further through the detection of crystal violet, ammonium nitrate, and thiram.

Supercontinuum generation from zinc borate glasses: bandgap versus rare-earth doping.

We report an enhanced supercontinuum generation (SCG) from a rare-earth () doped low bandgap zinc borate glass when excited with 60 fs pulses from a Ti-sapphire laser. The emission associated with the absorption bands due to doping (around 420-500 and 580-600 nm) is observed to assist the enhanced SCG.