Metallic nanocavity-enhanced second harmonic generation from a KNbO3 nonlinear nanowire |
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Authors: | Sung-Yong Kang Jonghwa Shin Kwang-Yong Jeong Chang-Min Lee Ki-Ju Yee Yong-Hee Lee |
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Institution: | 1. Department of Physics, KAIST, Daejeon, Republic of Korea;2. Department of Materials Science and Engineering and KI for the NanoCentury, KAIST, Daejeon, Republic of Korea;3. Department of Physics, Chungnam National University, Daejeon, Republic of Korea;4. Department of Nanoscience and Technology (WCU), KAIST, Daejeon, Republic of Korea |
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Abstract: | We propose and experimentally investigate a self-aligned metallic nanocavity that can enhance second harmonic signals from a single KNbO3 nanowire. With pump beams in the spectral proximity of the metallic nanocavity resonance, second harmonic intensity is observed to be >1800 times stronger than that of a typical bare nanowire under the same illumination conditions. By studying spectral features and polarization characteristics, we confirm that the nonlinear enhancement originates from the locally intensified electric field of a surface plasmon-polariton mode. This simple and robust scheme represents a powerful platform to study single nanowire nonlinearity. |
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