| 2 | Large optical nonlinearity enabled by coupled metallic quantum wells显示文摘New materials that exhibit strong second-order optical nonlinearities at a desired operational frequency are of paramount importance for nonlinear optics.Giant second-order susceptibility χ^((2)) has been obtained in semiconductor quantum wells(QWs).Unfortunately,the limited confining potential in semiconductor QWs causes formidable challenges in scaling such a scheme to the visible/near-infrared(NIR)frequencies for more vital nonlinear-optic applications.Here,we introduce a metal/dielectric heterostructured platform,i.e.,TiN/Al_(2)O_(3) epitaxial multilayers,to overcome that limitation.This platform has an extremely high χ^((2)) of approximately 1500 pm/V at NIR frequencies.By combining the aforementioned heterostructure with the large electric field enhancement afforded by a nanostructured metasurface,the power efficiency of second harmonic generation(SHG)achieved 10^(−4) at an incident pulse intensity of 10 GW/cm^(2),which is an improvement of several orders of magnitude compared to that of previous demonstrations from nonlinear surfaces at similar frequencies.The proposed quantum-engineered heterostructures enable efficient wave mixing at visible/NIR frequencies into ultracompact nonlinear optical devices. | Haoliang Qian Shilong Li Ching-Fu Chen Su-Wen Hsu Steven Edward Bopp Qian Ma Andrea R.Tao Zhaowei Liu | 2019 | Light(Science & Applications)2019，8，1： | 0 |
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