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Broadband Achromatic Metalens for Tunable Focused Vortex Beam Generation in the Near-Infrared Range

Vortex beams accompanied with orbital angular momentum have attracted significant attention in research fields due to their formidable capabilities in various crucial applications. However, conventional devices for generating vortex beams still suffer from bulky sizes, high cost, and confined perfor...

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Autores principales: Zhao, Lvrong, Jiang, Xiaoqiang, Wang, Zhihai, Chen, Yuwei, Chen, Lu, Gao, Bo, Yu, Weixing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10609118/
https://www.ncbi.nlm.nih.gov/pubmed/37887916
http://dx.doi.org/10.3390/nano13202765
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author Zhao, Lvrong
Jiang, Xiaoqiang
Wang, Zhihai
Chen, Yuwei
Chen, Lu
Gao, Bo
Yu, Weixing
author_facet Zhao, Lvrong
Jiang, Xiaoqiang
Wang, Zhihai
Chen, Yuwei
Chen, Lu
Gao, Bo
Yu, Weixing
author_sort Zhao, Lvrong
collection PubMed
description Vortex beams accompanied with orbital angular momentum have attracted significant attention in research fields due to their formidable capabilities in various crucial applications. However, conventional devices for generating vortex beams still suffer from bulky sizes, high cost, and confined performances. Metalens, as an advanced platform to arbitrarily control the optical waves, has promising prospects to address the predicament for conventional devices. Although great progress has been demonstrated in the applications of vortex beams, they are still confronted with fixed functionality after fabrication that severely hinders their application range. In this work, the phase-change material of Ge(2)Sb(2)Te(5) (GST) is employed to design the meta-atoms to realize tunable optical responses. Moreover, the focused vortex beam can be accomplished by superimposing a helical phase and hyperbolic phase, and the chromatic aberrations in near-infrared (NIR) range can be corrected by introducing an additional phase compensation. And the design strategy is validated by two different metalenses (BAMTF-1 and BAMTF-2). The numerical results indicate that the chromatic aberrations for two metalens can be corrected in 1.33–1.60 μm covering the telecom range. Moreover, the average focusing efficiency of BAMTF-1 is 51.4%, and that of BAMTF-2 is 39.9%, indicating the favorable performances of designed BAMTF. More importantly, their average focal lengths have a relative tuning range of 38.82% and 33.17% by altering the crystallization ratio of GST, respectively. This work may provide a significant scheme for on-chip and tunable devices for NIR imaging and communication systems.
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spelling pubmed-106091182023-10-28 Broadband Achromatic Metalens for Tunable Focused Vortex Beam Generation in the Near-Infrared Range Zhao, Lvrong Jiang, Xiaoqiang Wang, Zhihai Chen, Yuwei Chen, Lu Gao, Bo Yu, Weixing Nanomaterials (Basel) Article Vortex beams accompanied with orbital angular momentum have attracted significant attention in research fields due to their formidable capabilities in various crucial applications. However, conventional devices for generating vortex beams still suffer from bulky sizes, high cost, and confined performances. Metalens, as an advanced platform to arbitrarily control the optical waves, has promising prospects to address the predicament for conventional devices. Although great progress has been demonstrated in the applications of vortex beams, they are still confronted with fixed functionality after fabrication that severely hinders their application range. In this work, the phase-change material of Ge(2)Sb(2)Te(5) (GST) is employed to design the meta-atoms to realize tunable optical responses. Moreover, the focused vortex beam can be accomplished by superimposing a helical phase and hyperbolic phase, and the chromatic aberrations in near-infrared (NIR) range can be corrected by introducing an additional phase compensation. And the design strategy is validated by two different metalenses (BAMTF-1 and BAMTF-2). The numerical results indicate that the chromatic aberrations for two metalens can be corrected in 1.33–1.60 μm covering the telecom range. Moreover, the average focusing efficiency of BAMTF-1 is 51.4%, and that of BAMTF-2 is 39.9%, indicating the favorable performances of designed BAMTF. More importantly, their average focal lengths have a relative tuning range of 38.82% and 33.17% by altering the crystallization ratio of GST, respectively. This work may provide a significant scheme for on-chip and tunable devices for NIR imaging and communication systems. MDPI 2023-10-15 /pmc/articles/PMC10609118/ /pubmed/37887916 http://dx.doi.org/10.3390/nano13202765 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhao, Lvrong
Jiang, Xiaoqiang
Wang, Zhihai
Chen, Yuwei
Chen, Lu
Gao, Bo
Yu, Weixing
Broadband Achromatic Metalens for Tunable Focused Vortex Beam Generation in the Near-Infrared Range
title Broadband Achromatic Metalens for Tunable Focused Vortex Beam Generation in the Near-Infrared Range
title_full Broadband Achromatic Metalens for Tunable Focused Vortex Beam Generation in the Near-Infrared Range
title_fullStr Broadband Achromatic Metalens for Tunable Focused Vortex Beam Generation in the Near-Infrared Range
title_full_unstemmed Broadband Achromatic Metalens for Tunable Focused Vortex Beam Generation in the Near-Infrared Range
title_short Broadband Achromatic Metalens for Tunable Focused Vortex Beam Generation in the Near-Infrared Range
title_sort broadband achromatic metalens for tunable focused vortex beam generation in the near-infrared range
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10609118/
https://www.ncbi.nlm.nih.gov/pubmed/37887916
http://dx.doi.org/10.3390/nano13202765
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