Two-beam coupling by a hot electron nonlinearity

Paul J.; Miscuglio M.; Gui Y.; Sorger V. J.; Wahlstrand J. K.

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Two-beam coupling by a hot electron nonlinearity

机译：通过热电子非线性的双光束耦合

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Transparent conductive oxides such as indium tin oxide (ITO) bear the potential to deliver efficient all-optical functionality due to their record-breaking optical nonlinearity at epsilon near zero (ENZ) wavelengths. MI-optical applications generally involve more than one beam, but, to our knowledge, the coherent interaction between beams has not previously been discussed in these materials, which have a hot electron nonlinearity. Here we study the optical nonlinearity at ENZ in ITO and show that spatial and temporal interference has important consequences in a two-beam geometry. Our pump-probe results reveal a polarization-dependent transient that is explained by diffraction of pump light into the probe direction by a temperature grating produced by pump-probe interference. We further show that this effect allows tailoring the nonlinearity by tuning the frequency or chirp. Having fine control over the strong and ultrafast ENZ nonlinearity may enable applications in all-optical neural networks, nanophotonics, and spectroscopy. (C) 2021 Optical Society of America

机译：透明导电氧化物，如氧化铟锡（ITO），由于其在ε近零（ENZ）波长下破纪录的光学非线性，具有提供高效全光功能的潜力。MI光学应用通常涉及多个光束，但据我们所知，在这些具有热电子非线性的材料中，光束之间的相干相互作用以前没有讨论过。在这里，我们研究了ITO中ENZ的光学非线性，并表明在双光束几何中，空间和时间干涉具有重要影响。我们的泵浦-探测结果揭示了一个偏振相关的瞬态，这可以通过泵浦-探测干涉产生的温度光栅将泵浦光衍射到探测方向来解释。我们进一步表明，这种效应允许通过调谐频率或啁啾来调整非线性。对强且超快的ENZ非线性进行精细控制，可以在全光神经网络、纳米光子学和光谱学中应用。（2021）美国光学学会

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《Optics Letters》 |2021年第2期|共4页
作者
Paul J.; Miscuglio M.; Gui Y.; Sorger V. J.; Wahlstrand J. K.;
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NIST Phys Measurement Lab Gaithersburg MD 20899 USA;

George Washington Univ Dept Elect &

Comp Engn Washington DC 20052 USA;

George Washington Univ Dept Elect &

Comp Engn Washington DC 20052 USA;

George Washington Univ Dept Elect &

Comp Engn Washington DC 20052 USA;

NIST Phys Measurement Lab Gaithersburg MD 20899 USA;

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正文语种 eng
中图分类计量学;光学;
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9. Femtosecond two-beam coupling: can we measure the time for bound electrons to respond to an optical field? [C] . Smolorz, S., Wise, . 2000

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机译：光折变材料中非线性矢量双光束耦合和前向四波混频

Two-beam coupling by a hot electron nonlinearity

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