Spatio-temporal dynamics of excitons in semiconducting nanowires (Conference Presentation)

Bongsu Kim; Ryan Khan; Alexander Fast; Eric O. Potma

doi:10.1117/12.2290796

14 March 2018 Spatio-temporal dynamics of excitons in semiconducting nanowires (Conference Presentation)

Bongsu Kim, Ryan Khan, Alexander Fast, Eric O. Potma

Proceedings Volume 10530, Ultrafast Phenomena and Nanophotonics XXII; 105300K (2018) https://doi.org/10.1117/12.2290796
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

Excitonic excitations play an important role in the optical response of low-dimension nanoscale semi-conducting materials. During its lifetime, excitons may diffuse or migrate in particular directions, thus constituting a form of excitation information transfer on the nanoscale. The details of the spatio-temporal evolution of excitons remain unclear, because it has been challenging to directly visualize this process with nanometer spatial resolution and femtosecond temporal resolution. Here we describe pump-probe measurements at the nanoscale, using the photo-induced force microscopy (PiFM) and near-field scanning optical microscopy (NSOM) at ambient conditions. We analyze the spatial and temporal characteristics of the excitons in quasi-1D semiconductor nanowires, and provide unprecedented views of their evolution.

Conference Presentation

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Bongsu Kim, Ryan Khan, Alexander Fast, and Eric O. Potma "Spatio-temporal dynamics of excitons in semiconducting nanowires (Conference Presentation)", Proc. SPIE 10530, Ultrafast Phenomena and Nanophotonics XXII, 105300K (14 March 2018); https://doi.org/10.1117/12.2290796

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KEYWORDS

Excitons

Semiconductors

Femtosecond phenomena

Microscopy

Nanowires

Near field scanning optical microscopy

Near field optics

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