期刊
ACS PHOTONICS
卷 4, 期 3, 页码 454-461出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.6b00902
关键词
subwavelength nanostructures; nonlinear spectroscopy; symmetry breaking; polarization-selective device
类别
资金
- Australian Research Council (ARC)
- ARC Discover Early Career Research Fellowship [DE170100250]
- Erasmus Mundus NANOPHI [5659/002-001]
- Consejo Nacional de Ciencia y Tecnologia (CONACYT), Mexico
- Australia-Germany Joint Research Cooperation Scheme
- Australian Research Council [DE170100250] Funding Source: Australian Research Council
A novel type of non-linear symmetry breaking in symmetric plasmonic oligomers is reported. By monitoring the strength of the second-harmonic signal while changing the polarization angle of the pump, we observe nonlinear symmetry breaking as a large variation in the generated nonlinear signal. Importantly, the strongly anisotropic nonlinear response is produced by a symmetric structure with isotropic linear response when rotating polarization. We provide theoretical analysis to describe and characterize this effect. Our finding opens new avenues to reveal and characterize the symmetry of nanoscale structures and molecules and also to remotely monitor variations of near field patterns produced by symmetric nanostructures.
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