We investigate the ultrafast dynamics of a short-lived
entity –“The excited state”.
We use the techniques of steady-state and time-resolved
luminescence microscopy, confocal microscopy, laser induced transient
grating, multiphoton excitation spectroscopy as well as continuous wave (cw)
and ps z-scan.
Recent activities also include femtosecond pulse generation
using noncollinear optical parametric amplification, their characterisation
using the techniques of autocorrelation, frequency resolved optical gating
(FROG) and spectral phase interferometry for direct reconstruction of the
electric field (SPIDER).
New materials (such as graphene and metal nanoparticles) and
newly synthesised organic dipole/octupole systems with the properties of
Saturable absorption and Multiphoton absorption are target systems.
Whispering Gallery Modes (WGMs) are indispensable and we have exploited
these in microspheres for basic research, besides for a recent patent on