Prospects for sub-nanometer scale imaging of optical phenomena using electron microscopy

Ze Zhang, Archith Rayabharam, Joel Martis, Hao Kun Li, Narayana R. Aluru, Arun Majumdar

Research output: Contribution to journalArticlepeer-review

Abstract

Imaging of optical phenomena at the sub-nanometer scale can offer fundamental insights into the electronic or vibrational states in atomic-scale defects, molecules, and nanoparticles, which are important in quantum information, heterogeneous catalysis, optoelectronics, and structural biology. Several techniques have surpassed the traditional Abbe diffraction limit and attained spatial resolutions down to a few nanometers, but sub-nanometer scale optics has remained elusive. Here, we propose an approach that combines spectrally specific photoabsorption with sub-nanometer scale resolution transmission electron microscopy (TEM) of photoexcited electrons. We first estimate the signal level and conditions required for imaging nanoscale optical phenomena in core-shell quantum dots (QDs) like CdS/CdTe. Furthermore, we show the possibility of imaging photoexcited states of atomic-scale defects in a monolayer hexagonal boron nitride (h-BN) using ab initio and high resolution (HR)TEM simulations. The ability to directly visualize photoexcited states at the sub-nanometer scale opens opportunities to study properties of individual quantum dots and atomic defects.

Original languageEnglish (US)
Article number033104
JournalApplied Physics Letters
Volume118
Issue number3
DOIs
StatePublished - Jan 18 2021

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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