Overcoming the Abbe Diffraction Limit Using a Bundle of Metal‐Coated High‐Refractive‐Index Sapphire Optical Fibers,Advanced Optical Materials

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Overcoming the Abbe Diffraction Limit Using a Bundle of Metal‐Coated High‐Refractive‐Index Sapphire Optical Fibers
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-06-18 , DOI: 10.1002/adom.202000307
Kirill I. Zaytsev _{1,

2,

3} , Gleb M. Katyba _{1,

4} , Nikita V. Chernomyrdin _{1,

3} , Irina N. Dolganova _{3,

4} , Anna S. Kucheryavenko ₁ , Anna N. Rossolenko ₄ , Valery V. Tuchin _{5,

6} , Vladimir N. Kurlov _{3,

4} , Maksim Skorobogatiy ₇

Affiliation

While fiber bundles attract much interest in optics, their resolution is limited by the individual fiber size, which can be as large as a wavelength λ for common fiber optics materials. In order to increase fiber bundle resolution, in this work, high‐refractive‐index sapphire fibers with n > 3 are employed in the terahertz (THz) range, which ensures strong confinement of the guided modes and enables a fiber bundle resolution beyond the 0.62λ Abbe limit of free space optics. A sapphire fiber bundle is fabricated and its advanced resolution is experimentally demonstrated, using both analysis of the pair correlation function of the disordered fiber packing and continuous‐wave THz imaging. The resolution vares across the aperture with the mean value of 0.53λ, while, at certain regions of the bundle, it is as low as 0.3λ. The developed principles can be translated to any spectral range where high‐refractive‐index fiber optics materials are available.

中文翻译：

使用一束金属镀膜的高折射率蓝宝石光纤克服阿贝衍射极限

尽管光纤束引起了人们对光学器件的极大兴趣，但其分辨率却受到单个光纤尺寸的限制，单个光纤的尺寸可能与普通光纤材料的波长λ一样大。为了提高纤维束的分辨率，在这项工作中与高折射率蓝宝石纤维Ñ在太赫兹（THz）范围内采用大于3的频率，这可以确保严格限制引导模式，并使光纤束分辨率超过自由空间光学器件的0.62λ阿贝极限。利用无序纤维堆积的对相关函数分析和连续波太赫兹成像，制造了蓝宝石纤维束并通过实验证明了其先进的分辨率。分辨率在整个孔径上的平均值为0.53λ，而在光束的某些区域，分辨率低至0.3λ。可以将已开发的原理转换为可使用高折射率光纤材料的任何光谱范围。

更新日期：2020-06-18

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