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Lighting up long-range charge-transfer states by a localized plasmonic field
Zhen Xie1, Sai Duan, Chuan-Kui Wang
1Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
Nanoscale
|November 18, 2017
Summary
Introducing confined plasmons enhances long-range charge-transfer states in donor-acceptor systems by overcoming optical limitations. This breakthrough enables better light-harvesting and manipulation of quantum states.
Area of Science:
- Physical Chemistry
- Materials Science
- Quantum Optics
Background:
- Long-range charge-transfer (CT) states in donor-acceptor systems feature spatially separated electron-hole pairs.
- Achieving these states optically is challenging due to minimal wave function overlap between donor and acceptor components.
Purpose of the Study:
- To investigate the effect of spatially confined plasmons on the optical excitation of long-range charge-transfer states.
- To explore the potential for manipulating excited quantum states and visualizing molecular components.
Main Methods:
- Theoretical calculations and simulations were employed to model the donor-acceptor system.
- The influence of spatially confined plasmons on transition probabilities and symmetry selection rules was analyzed.
- Tip-enhanced resonance Raman scattering (TERR) imaging was utilized for visualization.
Main Results:
- Spatially confined plasmons were found to enhance transition probabilities to long-range CT states by breaking intrinsic symmetry selection rules.
- The intensity of local excitations could be selectively promoted, allowing for manipulation of excited quantum states.
- TERR imaging enabled unambiguous visualization of donor and acceptor moieties in real space.
Conclusions:
- Confined plasmons offer a viable strategy to overcome optical challenges in accessing long-range CT states.
- This approach facilitates the manipulation of excited quantum states and provides a powerful tool for molecular imaging.
- The findings have significant implications for advancing light-harvesting technologies and other optical processes.
