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Nano Lett. 2011 Jul 13;11(7):3022-5. doi: 10.1021/nl201743x. Epub 2011 Jun 3.

Nonlinear mixing in nanowire subwavelength waveguides.

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  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States.


The realization of nonlinear photonic circuits to achieve the control of light-by-light is contingent upon a strong nonlinear response that can be captured in a guided-wave geometry. There remains a need to further scale down waveguides while maintaining a strong nonlinear response. In this study, we report second-harmonic generation and optical parametric generation using the second-order nonlinear response in an 80 nm thick CdS nanowire subwavelength waveguide. Moreover, our three-dimensional finite-difference time-domain (FDTD) simulations demonstrate that it is possible to enhance the coherence length due to the very nature of the subwavelength geometry. Nonlinear mixing in a nanowire subwavelength waveguide represents an advance toward all-optical processing and all-optical switching in integrated photonic circuits.

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