• Advanced Photonics
  • Vol. 4, Issue 4, 046005 (2022)
Chengkuan Gao, Prabhav Gaur, Shimon Rubin*, and Yeshaiahu Fainman
Author Affiliations
  • University of California, San Diego, Department of Electrical and Computer Engineering, La Jolla, California, United States
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    DOI: 10.1117/1.AP.4.4.046005 Cite this Article Set citation alerts
    Chengkuan Gao, Prabhav Gaur, Shimon Rubin, Yeshaiahu Fainman. Thin liquid film as an optical nonlinear-nonlocal medium and memory element in integrated optofluidic reservoir computer[J]. Advanced Photonics, 2022, 4(4): 046005 Copy Citation Text show less

    Abstract

    Understanding light–matter interaction lies at the core of our ability to harness physical effects and to translate them into new capabilities realized in modern integrated photonics platforms. Here, we present the design and characterization of optofluidic components in an integrated photonics platform and computationally predict a series of physical effects that rely on thermocapillary-driven interaction between waveguide modes and topography changes of optically thin liquid dielectric film. Our results indicate that this coupling introduces substantial self-induced phase change and transmittance change in a single channel waveguide, transmittance through the Bragg grating waveguide, and nonlocal interaction between adjacent waveguides. We then employ the self-induced effects together with the inherent built-in finite relaxation time of the liquid film, to demonstrate that the light-driven deformation can serve as a reservoir computer capable of performing digital and analog tasks, where the gas–liquid interface operates both as a nonlinear actuator and as an optical memory element.
    h˙c(t)=α(P)·hc(t)+β(P),

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    Y=X·Wout,

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    |YYT|2+β|Wout|2,

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    Wout=(XTX+βIN)1XTY,

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    Ytest=XtestWout.

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    Er=100×γNtest,

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    τr<τ<τw,

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    {xn}n=1N{yn}n=1+δN;yn=xnδxn,

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    hc(n)=f[hc(n1),P(n)],

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    Chengkuan Gao, Prabhav Gaur, Shimon Rubin, Yeshaiahu Fainman. Thin liquid film as an optical nonlinear-nonlocal medium and memory element in integrated optofluidic reservoir computer[J]. Advanced Photonics, 2022, 4(4): 046005
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