Broadband Achromatic Metalens in Mid-Wavelength Infrared,Laser & Photonics Reviews

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Broadband Achromatic Metalens in Mid-Wavelength Infrared
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-07-09 , DOI: 10.1002/lpor.202100020
Kai Ou _{1,

2,

3,

4} , Feilong Yu _{1,

2,

3,

4} , Guanhai Li _{1,

2,

3,

4,

5} , Wenjuan Wang _{1,

4} , Jin Chen _{1,

4} , Andrey E. Miroshnichenko ₆ , Lujun Huang ₆ , Tianxin Li _{1,

4} , Zhifeng Li _{1,

4} , Xiaoshuang Chen _{1,

2,

3,

4} , Wei Lu _{1,

2,

3,

4}

Affiliation

Metasurface provides a powerful platform to correct the chromatic aberration of conventional lenses in a flexible, integratable, and ultra-compact manner. Mid-wavelength infrared has promised many exciting applications ranged from molecular fingerprint detection to low-light-level night vision. Developing broadband achromatic metalens in mid-wavelength infrared becomes necessary to meet the increasingly urgent demands on high performance photonic devices. Here, we demonstrate the broadband achromatic metalenses from 3.5 to 5 µm with all-silicon metasurfaces. Large phase dispersion control range is achieved to realize metalenses with both large numerical apertures and sample sizes while maintaining high focusing efficiency. The experimental results verify the diffraction-limited achromatic focusing and imaging of the metalenses in mid-wavelength infrared. Additionally, we also demonstrate the versatility by successfully implementing the generation of the broadband achromatic focusing optical vortex (L = 2). This work represents a solid step toward practical implementation of metalens and may find applications in mid-wavelength infrared imaging and detections.

中文翻译：

中波长红外中的宽带消色差元透镜

Metasurface 提供了一个强大的平台，以灵活、可集成和超紧凑的方式校正传统镜头的色差。中波长红外已经承诺了许多令人兴奋的应用，从分子指纹检测到微光夜视。为了满足对高性能光子器件日益紧迫的需求，开发中波长红外宽带消色差元透镜变得必要。在这里，我们展示了具有全硅超表面的 3.5 到 5 µm 的宽带消色差超透镜。实现了大相位色散控制范围，以实现具有大数值孔径和样本尺寸的超透镜，同时保持高聚焦效率。实验结果验证了中波长红外超透镜的衍射极限消色差聚焦和成像。此外，我们还通过成功实现宽带消色差聚焦光学涡旋（L = 2）。这项工作代表了迈向实际实现超透镜的坚实一步，可能会在中波长红外成像和检测中找到应用。

更新日期：2021-09-16

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