Welcome to Samanta's Research Group





Research



RESEARCH HIGHLIGHT  (as on 29.06.2020)



Research Topics and Techniques



Single Molecule Fluorescence Spectroscopy:

Fluorescence correlation spectroscopy (FCS) is a single molecule technique in which fluctuation of fluorescence intensity of a highly diluted solution in a small volume is monitored. We utilize this technique for the study of (i) diffusion of fluorophores in complex environments like ionic liquids, deep eutectic solvents, and solution of biomolecules, (ii) photo-induced conformational changes, and (iii) other excited state processes. We also study fluorescence off-on blinking, a single molecule property, to understand the optical properties of quantum dots and perovskite nanocrystals.

description here

Power dependence of fluorescence correlation curves 		description here

Conformational Dynamics of Protein by FCS Study 		description here

Single Particle Quantum Dot (QD) Fluorescence Blinking
Time-Resolved Fluorescence Spectroscopy:

In our research, we extensively use single photon counting and up-conversion based time-resolved fluorescence techniques for measurements of the kinetics of a variety of photo-induced processes in the fs-ns time-domain. We have used these facilities for studying electron, proton and energy transfer processes, solvent reorganization dynamics, rotational dynamics, etc in a variety of complex environments.

description here

Mechanism of Solvation Dynamics in ILs 		description here

Time-Resolved Emission Spectra (TRES) of DMABN in [bmim][PF6] IL 		description here

Time-Resolved Fluorescence Anisotropy in Morpholinium ILs
Transient Absorption Spectroscopy:

We employ femtosecond pump-probe and nanosecond laser flash photolysis facilities for spectroscopic characterization of short-lived non-fluorescent transients having lifetimes ranging from a few femtoseconds to a few milliseconds and study of their formation and decay dynamics.

description here

Nanosecond Laser Flash Photolysis Study of the Photoinduced Electron Transfer (PET) Reaction in ILs 		description here

Triplet-Triplet Energy Transfer Studies by Laser Flash Photolysis
description here

Time-resolved transient absorption spectra of CdTe QDs in IL medium 		description here

Ultrafast bleach recovery in QD


Systems of our Interest:


description here

Ionic liquids 		description here



Biomolecules 		description here

Nanomaterials