Probing ultrafast dynamics of photo-excited Bismuth nanostructure

The present work shows the primarily results of ultrafast dynamics of photo-excited Bismuth (Bi) nanostructure through Femtosecond optical pump-probe spectroscopy technique. The study is an attempt to explore distinctive features of Bi nanostructure manifested due to its unusual electronic properties. The results reveal Bismuth charge carrier dynamics in terms of positive Delta A/A signal in visible-NIR region due to photo-excitation of Bi nanostructure by ultrafast pulses. The positive signal is attributed to excited state absorption arises due to various reasons like surface plasmons and phonons in visible region and interband plasmonic resonances in NIR region. The observed features of ultrafast dynamics reflect potential of Bi for applications of solar energy harversting.