Ultrafast optical microscopy, generally employed by incorporating ultrafast laser pulses into
microscopes, can provide spatially resolved mechanistic insight into scientific problems …

Ultrafast excitation of nanoparticles can excite the acoustic vibrational modes of the structure
that correlate with the expansion coordinates. These modes are frequently seen in transient …

The fundamental and n= 3 overtones of Au nanoplate thickness vibrations have been
studied by transient absorption microscopy. The frequencies of the n= 3 overtone are less …

Optical applications of plasmonic nanoparticles depend critically on particle properties such
as relative proximity, composition, crystallinity, and shape. The most common nanoparticle …

Coherent acoustic vibrations of nanoresonators have attracted considerable attention, owing
to their rich phonon spectra. Understanding and manipulating coherent acoustic vibrational …

Time-resolved spectroscopy of plasmonic nanoparticles is a vital technique for probing their
ultrafast electron dynamics and subsequent acoustic and photothermal properties …

Coherent acoustic phonons induced in metallic nanostructures have attracted tremendous
attention owing to their unique optomechanical characteristics. The frequency of the acoustic …

In this thesis, I will describe the technique of Asynchronous Optical Sampling and its use in a
variety of experimental spectroscopic methodologies, as well as the results and theories …