Theoretical and experiments investigation of broadband dispersion tailoring of high-order mode in the hybrid microsphere cavity

Ke Chaozhen; Ma Jing; Huang Yantang; Zeng Zhiping; Xu Canhua; Qin Jingjing

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Theoretical and experiments investigation of broadband dispersion tailoring of high-order mode in the hybrid microsphere cavity

机译：杂交微球腔高阶模式宽带分散剪裁的理论与实验

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The large normal dispersion of the fundamental mode (TEn=1 mode) in the whispering gallery modes (WGM) microsphere is detrimental to the visible comb generation. Herein, we demonstrate that this fundamental limitation can be removed by considering the high-order radial modes (TEn=2 mode) of the hybrid microsphere cavity (HMC). The studied HMC consists of a high-refractive-index coating (TiO2 or HfO2) and silica microsphere. The simulated electric field energy distribution and measured Q value in our experiment show that optical confinement of the coating effectively excites the TEn=2 mode and reduces the free spectral range (FSR) and modal dispersion. In addition, the observed redshift of WGM and decreased trend of FSR are in accordance with simulations. The zero-dispersion wavelength can be linearly shifted to a shorter wavelength or even into the visible region with the reduction of coating thickness or refractive index and larger microcavity, which advances the visible comb generation. (C) 2019 Optical Society of America

机译：耳语廊道模式（WGM）微球中的基本模式（十= 1模式）的大正常分散是对可见梳状的有害。在此，我们证明可以通过考虑混合体微球腔（HMC）的高阶径向模式（十= 2模式）来除去这种基本限制。研究的HMC由高折射率涂层（TiO 2或HFO 2）和二氧化硅微球组成。在我们的实验中模拟电场能量分布和测量Q值表明，涂层的光学限制有效激发了十个= 2模式，并减少了自由谱范围（FSR）和模态分散体。此外，观察到的WGM的红移和FSR的下降趋势符合模拟。通过减小涂层厚度或折射率和更大的微腔，可以将零色散波长线性地移位到较短的波长或甚至进入可见区域和更大的微腔。（c）2019年光学学会

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《Applied optics》 |2019年第6期|共8页
作者
Ke Chaozhen; Ma Jing; Huang Yantang; Zeng Zhiping; Xu Canhua; Qin Jingjing;
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Fuzhou Univ Coll Phys &

Informat Engn Fuzhou 350108 Fujian Peoples R China;

Fuzhou Univ Coll Phys &

Informat Engn Fuzhou 350108 Fujian Peoples R China;

Fuzhou Univ Coll Phys &

Informat Engn Fuzhou 350108 Fujian Peoples R China;

Fuzhou Univ Coll Phys &

Informat Engn Fuzhou 350108 Fujian Peoples R China;

Fuzhou Univ Coll Phys &

Informat Engn Fuzhou 350108 Fujian Peoples R China;

Fuzhou Univ Coll Phys &

Informat Engn Fuzhou 350108 Fujian Peoples R China;

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Theoretical and experiments investigation of broadband dispersion tailoring of high-order mode in the hybrid microsphere cavity

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