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Growth of Au Hollow Stars and Harmonic Excitation Energy Transfer
- Source :
- ACS Nano; January 2020, Vol. 14 Issue: 1 p736-745, 10p
- Publication Year :
- 2020
-
Abstract
- Optical excitation, subsequent energy transfer, and emission are fundamental to many physical problems. Optical antennas are ideal candidates for manipulating these processes. We extend energy transfer to second- and third-harmonic (SH and TH) fields through the collaborative susceptibility χ(n)(n= 1, 2, 3) resonances of nonlinear optical antennas. Hollow gold stars, with a broadband response covering the fundamental, SH, and TH frequencies, are synthesized as nonlinear antennas. Harmonic resonance energy transfer through a χ(3)→ χ(1)collaboration is revealed. A χ(3)→ χ(2)collaboration is uncovered, with largely enhanced SH radiation demonstrated by exciting the three resonances at the fundamental, SH, and TH frequencies. A theoretical model of the effective nonlinear susceptibilities is proposed to calculate the efficiencies of the two nonlinear energy transfer processes.
Details
- Language :
- English
- ISSN :
- 19360851 and 1936086X
- Volume :
- 14
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- ACS Nano
- Publication Type :
- Periodical
- Accession number :
- ejs51738734
- Full Text :
- https://doi.org/10.1021/acsnano.9b07686