Continuously varifocal metalens for broadband achromatic focusing of terahertz waves
The correction of chromatic aberration is essential for promoting broadband imaging systems, which can be accomplished by recently proposed broadband achromatic metalenses (BAMs) in a more compact and efficient way compared to that of traditional optical lenses. However, current BAMs are limited to...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-09-01
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| Series: | Journal of Science: Advanced Materials and Devices |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468217923000291 |
| _version_ | 1827860783997911040 |
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| author | Xiao-Qiang Jiang Wen-Hui Fan Lv-Rong Zhao Xu Chen Chong Qin Hui Yan Qi Wu Pei Ju |
| author_facet | Xiao-Qiang Jiang Wen-Hui Fan Lv-Rong Zhao Xu Chen Chong Qin Hui Yan Qi Wu Pei Ju |
| author_sort | Xiao-Qiang Jiang |
| collection | DOAJ |
| description | The correction of chromatic aberration is essential for promoting broadband imaging systems, which can be accomplished by recently proposed broadband achromatic metalenses (BAMs) in a more compact and efficient way compared to that of traditional optical lenses. However, current BAMs are limited to the fixed functionality that severely hinders their potential applications. In order to address such limitation, a continuously varifocal and broadband achromatic metalens (CVBAM) for converging THz waves is proposed by employing thermally tunable material of indium antimonide. At initial temperature, numerical results manifest that the chromatic aberration over 1.8–2.2 THz can be well corrected by CVBAM and the transverse sizes of corresponding focal spots are beyond the Abbe diffraction limit. Moreover, the numerical aperture (NA) and average focusing efficiency of CVBAM and up to 0.62 and 73.3%, respectively. In addition, the average focal length of CVBAM has a tunable range from 736.25 μm (NA = 0.62) to 861.02 μm (NA = 0.56) by altering operation temperature. This work may offer an advanced scheme for designing tunable BAMs, which can remarkably facilitate the development of THz near-field imaging and spectroscopy systems. |
| first_indexed | 2024-03-12T13:27:50Z |
| format | Article |
| id | doaj.art-ca429640f04c4ff58c66d56bb9641f80 |
| institution | Directory Open Access Journal |
| issn | 2468-2179 |
| language | English |
| last_indexed | 2024-03-12T13:27:50Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Science: Advanced Materials and Devices |
| spelling | doaj.art-ca429640f04c4ff58c66d56bb9641f802023-08-25T04:24:29ZengElsevierJournal of Science: Advanced Materials and Devices2468-21792023-09-0183100560Continuously varifocal metalens for broadband achromatic focusing of terahertz wavesXiao-Qiang Jiang0Wen-Hui Fan1Lv-Rong Zhao2Xu Chen3Chong Qin4Hui Yan5Qi Wu6Pei Ju7State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR ChinaState Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, PR China; Corresponding author. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, PR China.University of Chinese Academy of Sciences, Beijing 100049, PR ChinaState Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, PR ChinaState Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR ChinaState Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR ChinaState Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR ChinaState Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, PR ChinaThe correction of chromatic aberration is essential for promoting broadband imaging systems, which can be accomplished by recently proposed broadband achromatic metalenses (BAMs) in a more compact and efficient way compared to that of traditional optical lenses. However, current BAMs are limited to the fixed functionality that severely hinders their potential applications. In order to address such limitation, a continuously varifocal and broadband achromatic metalens (CVBAM) for converging THz waves is proposed by employing thermally tunable material of indium antimonide. At initial temperature, numerical results manifest that the chromatic aberration over 1.8–2.2 THz can be well corrected by CVBAM and the transverse sizes of corresponding focal spots are beyond the Abbe diffraction limit. Moreover, the numerical aperture (NA) and average focusing efficiency of CVBAM and up to 0.62 and 73.3%, respectively. In addition, the average focal length of CVBAM has a tunable range from 736.25 μm (NA = 0.62) to 861.02 μm (NA = 0.56) by altering operation temperature. This work may offer an advanced scheme for designing tunable BAMs, which can remarkably facilitate the development of THz near-field imaging and spectroscopy systems.http://www.sciencedirect.com/science/article/pii/S2468217923000291TerahertzMetalensVarifocalBroadband achromaticIndium antimonide |
| spellingShingle | Xiao-Qiang Jiang Wen-Hui Fan Lv-Rong Zhao Xu Chen Chong Qin Hui Yan Qi Wu Pei Ju Continuously varifocal metalens for broadband achromatic focusing of terahertz waves Journal of Science: Advanced Materials and Devices Terahertz Metalens Varifocal Broadband achromatic Indium antimonide |
| title | Continuously varifocal metalens for broadband achromatic focusing of terahertz waves |
| title_full | Continuously varifocal metalens for broadband achromatic focusing of terahertz waves |
| title_fullStr | Continuously varifocal metalens for broadband achromatic focusing of terahertz waves |
| title_full_unstemmed | Continuously varifocal metalens for broadband achromatic focusing of terahertz waves |
| title_short | Continuously varifocal metalens for broadband achromatic focusing of terahertz waves |
| title_sort | continuously varifocal metalens for broadband achromatic focusing of terahertz waves |
| topic | Terahertz Metalens Varifocal Broadband achromatic Indium antimonide |
| url | http://www.sciencedirect.com/science/article/pii/S2468217923000291 |
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