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Broadband achromatic mid-infrared metalens with polarization-insensitivity.
- Source :
-
AIP Advances . Feb2022, Vol. 12 Issue 2, p1-7. 7p. - Publication Year :
- 2022
-
Abstract
- Metasurfaces have shown excellent ability in manipulating light fields. However, the intrinsic chromatic aberration impairs the quality of their broadband operation, which is a serious problem restricting the application of metadevices, especially metalenses. In this paper, a polarization-independent broadband achromatic metalens composed of engineered structures that have spatially varying gradient sizes is devised to focus the light over the mid-infrared region from 3 to 5 µm. The proposed dielectric metalens is constructed by an array of meta-units with a hollowed square pillar. By tuning its structural parameters, the optical response of the meta-unit turns out to be broadband achromatic, insensitive to the polarization state, and of high efficiency. Numerical simulation results show that the designed metalens can significantly suppress chromatic aberrations over a broad mid-infrared and hold a focusing efficiency of nearly 75%. Our work is beneficial to improving the mid-infrared broadband imaging quality and detection efficiency. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ACHROMATISM
*COMPUTER simulation
*DIELECTRICS
Subjects
Details
- Language :
- English
- ISSN :
- 21583226
- Volume :
- 12
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- AIP Advances
- Publication Type :
- Academic Journal
- Accession number :
- 155684697
- Full Text :
- https://doi.org/10.1063/5.0079294