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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. Structured beams such as Laguerre Gauss
(LG), Bessel beams and other dark-core beams are of special interest in
recent years.
Recent activities also include quantum imaging and sensing
and interplay of femtosecond-pulses using noncollinear
optical parametric amplification, pump-probe techniques, pulse
characterisation using the techniques of autocorrelation, frequency
resolved optical gating (FROG) and spectral phase interferometry for direct
reconstruction of the electric field (SPIDER).
Low dimensional materials (such as graphene, HBN, MoS2,
WS2 and metal nanoparticles) and newly synthesised organic
dipole/octupolar systems with the properties of Saturable absorption and Multiphoton absorption are
target systems.
Fair amount of activity runs on Whispering Gallery Modes (WGMs)of a cavity.
A recent patent using photonic nanojet (PNJ) is
another area on Raman enhancement. Overall, the focus of the research work is the training of the
future generation!
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