The research interests of the Optics, Spectroscopy and Molecular Dynamics (OSMD) group covers diverse topics including terahertz (THz) spectroscopy of various materials, probing ultrafast dynamics in condensed matter systems using transient UV-Vis-IR-THz spectroscopy, static and time resolved second harmonic and third harmonic generation spectroscopy, studies on the dynamics of the driven-dissipative quantum systems, and molecular dynamics in electron collisions, investigating exciton dynamics in semiconductors, optical micro-manipulation of mesoscopic particles and probing a variety of exotic light-matter interactions using optical tweezers, quantum weak measurement using classical light and exploring strong light-matter interactions associated with the evanescent field of light at nanometer length scales and so on. The SpinLab group strives to answer fundamental questions on the dynamics of driven-dissipative quantum systems, theoretically through the quantum master equations, and experimentally by using magnetic resonance spectroscopy. The Ultrafast THz spectroscopy group investigates novel THz generation, detection and imaging techniques. The group also studies ultrafast dynamics in condensed matter systems using femtosecond pump-probe spectroscopy and time and frequency resolved THz, high harmonic generation spectroscopy in wide range of systems, namely, 2D layered materials, 2D systems like 2DEG/2DHG, topological systems, solar cells, strongly correlated systems and artificially created metamaterials etc. The Semiconductor spectroscopy group employs various linear and nonlinear optical spectroscopic techniques to study the optoelectronic properties of emerging materials, exciton dynamics in semiconductor nanostructures, nonlinear optical phenomena in organic and inorganic materials and so forth. The Molecular physics team study molecular dynamics in low and intermediate energy electron-molecule collisions using state-of-the-art experimental techniques. The ‘Light Matter lab’ employs 'optical tweezers' to study a variety of intriguing phenomena emerging from the interaction of a strongly focused light beam with mesoscopic particles. Spin orbit interaction of light, stochastic equilibrium and non-equilibrium statistical mechanics, microrheology, optical trapping in air employing photophoretic forces, microbubble lithography, precision biosensing using bioinspired waveguides are just a smattering of the diverse fundamental problems and potential photonic applications actively pursued by the group. The research of “bioNap lab” is primarily focused in the domain of nano optics, investigating wide variety of non-trivial optical phenomena emerging from light-matter interactions at the nanometer length scale, exploring development of novel experimental concepts and photonic devices based on polarization, geometrical phase, angular momentum of light and optical weak measurements. The details of the research activities of individual members of the group can be found in their personal profile pages and laboratory homepages.

Nirmalya Ghosh
Professor
033 - 61360000 (1257)
nghosh [at] iiserkol.ac.in