Ultralong photonic nanojet formed by dielectric microtoroid structure

Zhang Baifu; Hao Jingjing; Shen Zhe; Wu Heng; Zhu Kang; Xu Ji; Ding Jianping

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Ultralong photonic nanojet formed by dielectric microtoroid structure

机译：通过介电微型结构形成的超龙光子纳米喷嘴

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A photonic nanojet (PNJ) is a highly confined light beam formed by a transparent particle under light wave illumination. Here, we propose and numerically investigate the PNJ formed by a dielectric circular toroid with micro dimensions and a homogenous refractive index. Three-dimensional finite-difference time-domain (FDTD) simulations are conducted and demonstrate that ultralong PNJs can be formed by the doughnut-like structure. Besides, microtoroid structures can allow high-index materials (n = 3.5) for PNJ generation. Various PNJ properties, including the focal distance, PNJ length, full width at half-maximum, and maximum intensity, can be flexibly tuned by modifying the geometry of the proposed structure. (C) 2018 Optical Society of America

机译：光子纳米喷嘴（PNJ）是由光波照明下的透明颗粒形成的高度限制光束。这里，我们提出并在数值上研究由介电圆形环形形成的PNJ，其具有微尺寸和均匀的折射率。进行三维有限差分时间域（FDTD）模拟，并证明可以通过甜甜圈的结构形成超强PNJ。此外，微型结构可以允许PNJ生成的高折射率材料（n = 3.5）。通过修改所提出的结构的几何形状，可以灵活地调整各种PNJ属性，包括焦距，PNJ长度，半最大值，最大强度和最大强度。（c）2018年光学学会

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来源
《Applied optics》 |2018年第28期|共7页
作者
Zhang Baifu; Hao Jingjing; Shen Zhe; Wu Heng; Zhu Kang; Xu Ji; Ding Jianping;
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作者单位

Nanjing Univ Sci &

Technol Sch Elect &

Opt Engn Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Sch Elect &

Opt Engn Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Sch Elect &

Opt Engn Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Sch Elect &

Opt Engn Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Sch Elect &

Opt Engn Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Posts &

Telecommun Coll Elect &

Opt Engn Nanjing 210023 Jiangsu Peoples R China;

Nanjing Univ Collaborat Innovat Ctr Adv Microstruct Nanjing 210093 Jiangsu Peoples R China;

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Ultralong photonic nanojet formed by dielectric microtoroid structure

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