In a Nutshell
I am Pritam Khan, H2020 ASINA Postdoctoral fellow at the Department of Physics, University of Limerick. Presently I am working with Dr. Christophe Silien and Prof. Tofail Syed in the MOSAIC group. I was a former IRC at University of Limerick and JSPS Postdoctoral fellow at the Department of Physics, Kyushu University in the Optical Condensed Matter Physics (OCMP) research group with Prof. Takuya Satoh. I have completed my PhD from Indian Institute of Science Education and Research, Bhopal, India under the supervision of Dr. K V Adarsh in Ultrafast Spectroscopy lab.
Research Highlights
We demonstrate circular polarization handedness conversion in spherical particles as an example of spin to orbital angular momentum exchange mediated by quadrupole plasmon. These results offer new perspectives in molecule sensing.
We demonstrate we unveiled for the first time third-order optical nonlinearity in NCO in terms of strong intensity-dependent excited state absorption. We showed the straightforward application in optical limiting devices
Optics Letters 46, 5930 (2021)
We demonstrate for the first time ultrafast light driven simultaneous excitation of coherent optical phonon and three coherent magnon modes in THz and sub-THz frequency range by ISRS.
Our results indicate three vs two stages of photo-dissolution in Ag/As2S3 heterostructure depending on the Ag layer thickness. Real time AFM measurements provides direct evidence of different stages of photo-dissolution.
We demonstrate for the first time ultrafast light driven simultaneous excitation of coherent optical phonon and three coherent magnon modes in THz and sub-THz frequency range by ISRS.
We employed femtosecond pump-probe technique to demonstrate that ultrafast exciton-plasmon coupling in Ge24Se76/AuNP heterostrcuture leads to dramatic suppression of exciton and plasmon absorptions
Nanosecond (ns) transient absorption (TA) decreases dramatically from floppy to rigid system: First experimental evidence of network rigidity theory.
Continuous wave background illumination (BGI) provides a novel way in tuning the TA-spectral blue shift in BGI samples when compared to as-prepared (ASP) ones.
First observation of coexistence of photodarkening (PD) and photobleaching (PB) in Ge-As-Se thin films. Crossover from PD in Ge deficient sample to PB in Ge rich samples.
Nature Scientific Reports 4, 4029 (2014)
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Nanosecond laser induced thermally tunable transient dual absorption bands . TA1 arises from interband transition whereas TA2 is related to localized defect states.