Prospects for sub-nanometer scale imaging of optical phenomena using electron microscopy
- Stanford Univ., CA (United States). Dept. of Mechanical Engineering
- Univ. of Illinois at Urbana-Champaign, IL (United States). Dep. of Mechanical Science and Engineering
- Univ. of Illinois at Urbana-Champaign, IL (United States). Dep. of Mechanical Science and Engineering; Univ. of Illinois at Urbana-Champaign, IL (United States). Beckman Inst. for Advanced Science and Technology
- Stanford Univ., CA (United States). Dept. of Mechanical Engineering; SLAC National Accelerator Lab., Menlo Park, CA (United States). Dept. of Photon Science; Stanford Univ., CA (United States). Precourt Institute for Energy
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.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-76SF00515; SC0019112
- OSTI ID:
- 1782091
- Alternate ID(s):
- OSTI ID: 1761252
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 3 Vol. 118; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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