Design for a Si-based nanoplasmonic waveguide structure for third-harmonic generation showing excitation (pink) and emission (green).

From the article:

Coherent Visible-Light-Generation Enhancement in Silicon-Based Nanoplasmonic Waveguides via Third-Harmonic Conversion
S. Sederberg and A. Y. Elezzabi
Phys. Rev. Lett. 114, 227401 (2015)

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