Growth of Au Hollow Stars and Harmonic Excitation Energy Transfer.
ACS Nano
; 14(1): 736-745, 2020 Jan 28.
Article
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| MEDLINE
| ID: mdl-31841297
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) â χ(1) collaboration is revealed. A χ(3) â 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.
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MEDLINE
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En
Revista:
ACS Nano
Año:
2020
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Article
País de afiliación:
China