Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States.
Nano Lett. 2011 Jul 13;11(7):3022-5. doi: 10.1021/nl201743x. Epub 2011 Jun 3.
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.
要实现通过光控光来实现非线性光子电路，需要在导波结构中获得强非线性响应。这就需要在保持强非线性响应的同时，进一步缩小波导的尺寸。在本研究中，我们在 80nm 厚的 CdS 纳米线亚波长波导中利用二阶非线性响应，报告了二次谐波产生和光参量产生。此外，我们的三维有限差分时域（FDTD）模拟表明，由于亚波长结构的本质，可以提高相干长度。纳米线亚波长波导中的非线性混合代表了在集成光子电路中实现全光处理和全光开关的进展。
