文章基本信息

标题：Role of the substrate in monolithic AlGaAs nonlinear nanoantennas
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作者：Valerio Flavio Gili ; Luca Carletti ; Fares Chouchane 等
期刊名称：Nanophotonics
印刷版ISSN：2192-8606
电子版ISSN：2192-8614
出版年度：2017
卷号：7
期号：2
页码：517-521
DOI：10.1515/nanoph-2017-0026
出版社：Walter de Gruyter GmbH
摘要：We report the effect of the aluminum oxide substrate on the emission of monolithic AlGaAs-on-insulator nonlinear nanoantennas. By coupling nonlinear optical measurements with electron diffraction and microscopy observations, we find that the oxidation-induced stress causes negligible crystal deformation in the AlGaAs nanostructures and only plays a minor role in the polarization state of the harmonic field. This result highlights the reliability of the wet oxidation of thick AlGaAs optical substrates and further confirms the bulk χ (2) origin of second harmonic generation at 1.55 μm in these nanoantennas, paving the way for the development of AlGaAs-on-insulator monolithic metasurfaces..
关键词：harmonic generation and mixing ; integrated optics devices ; subwavelength structures