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Voltage tunable mid-wave infrared reflective varifocal metalens via an optomechanic cavity

机译：通过光学力学腔电压可调中波红外反射变形变量丝金属

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摘要

Metalenses enable the multifunctional control of light beams with an optically thin layer of nanoantennas. Efficient on-chip voltage tuning of the focal length is the crucial step toward the integration of metalenses into dynamically tunable optical systems. We propose and numerically investigate the on-chip electrical tuning of a reflective metalens via an optomechanic cavity. Light is focused by an array of silicon nanopillar antennas separated from a deformable metallic reflector by a small air gap. A transparent electrode is inserted into the optomechanic cavity to electrostatically deform the reflector and rearrange the reflection phase profile, resulting in a shift in the focal point. Two modes of voltage tuning via the relative curvature change of the reflector are analyzed. In mode 1, the size of the air gap is modified through the nearly parallel shift of the reflector, whereas in mode 2, the distribution of the air-gap size is tailored by the curvature change of the reflector. With the designed working wavelength of 3.8 mu m and the initial focal length of 80.35 mu m, the focal length is shifted by 20.3 mu m in mode 1 and 7.25 mu m in mode 2. Such a device can be used as a free space coupler between quantum cascade lasers and mid-infrared fibers with variable coupling efficiency. (C) 2021 Optical Society of America
机译：金属传感器通过光学薄层的纳米天线实现了对光束的多功能控制。有效的焦距片上电压调谐是将金属传感器集成到动态可调谐光学系统的关键步骤。我们提出并数值研究了反射金属通过光机腔的片上电调谐。光由一组硅纳米柱天线聚焦，这些天线通过一个小气隙与可变形金属反射器分离。将透明电极插入光机腔中，使反射器静电变形并重新排列反射相位轮廓，从而导致焦点偏移。分析了通过反射器相对曲率变化进行电压调谐的两种模式。在模式1中，气隙的大小通过反射器的几乎平行移动来修改，而在模式2中，气隙大小的分布由反射器的曲率变化来调整。设计工作波长为3.8μm，初始焦距为80.35μm，模式1的焦距偏移20.3μm，模式2的焦距偏移7.25μm。这种器件可以作为量子级联激光器和中红外光纤之间的自由空间耦合器，具有可变的耦合效率。（2021）美国光学学会

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  • 来源
    《Optics Letters》 |2021年第8期|共4页
  • 作者

    Chen Yikun; Pu Shiliang; Wang Chongzhi; Yi Fei;

  • 作者单位

    Huazhong Univ Sci &

    Technol Sch Opt &

    Elect Informat Wuhan 430074 Peoples R China;

    Hangzhou Hikvis Digital Technol Co Ltd Hikvis Res Inst Hangzhou 310051 Peoples R China;

    Huazhong Univ Sci &

    Technol Sch Opt &

    Elect Informat Wuhan 430074 Peoples R China;

    Huazhong Univ Sci &

    Technol Sch Opt &

    Elect Informat Wuhan 430074 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
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