Study proposes achromatic metalens with varifocal performance- Times Of Nation
Metalenses, comprising one of the most prominent applications of metasurfaces, demonstrate promising abilities to replace traditional lenses. By manipulating the phase distribution of metalenses composed of appropriately arranged meta-atoms, the wavefront of incidence can be arbitrarily controlled to achieve desired purposes.
Broadband achromatic metalenses (BAMs) that correct chromatic aberration in broadband applications have found practical applications. However, existing BAMs are limited to a single functionality, which impedes potential applications after fabrication. Producing continuously varifocal metalenses for broadband achromatic focusing is still a challenge.
To overcome this challenge, a research team led by Prof. Dr. Fan Wenhui from Xi’an Institute of Optics and Precision Mechanics (XIOPM) of the Chinese Academy of Sciences (CAS) proposed a metalens for designing tunable BAMs, a continuously varifocal and broadband achromatic metalens (CVBAM). The study was published in the Journal of Science- Advanced Materials and Devices.
The researchers selected the semiconductor material indium antimonide (InSb) with tunable responses to design meta-atoms for accomplishing phase compensation required by CVBAM with the operation frequency range of 1.8 to 2.2 THz.
The CVBAM was designed to converge the focal spots to a preset spatial location over the operation frequency range. By varying the external temperature, the focal length of the CVBAM can be dynamically tuned from 736.25 μm to 861.02 μm, while the achromatic focusing can be maintained, as well.
The proposed metalens can significantly enrich the capabilities and potential applications of current meta-devices, which may facilitate the development of THz near-field imaging and spectroscopy systems.
Xiao-Qiang Jiang et al, Continuously varifocal metalens for broadband achromatic focusing of terahertz waves, Journal of Science- Advanced Materials and Devices (2023). DOI- 10.1016/j.jsamd.2023.100560
Chinese Academy of Sciences
Study proposes achromatic metalens with varifocal performance (2023, May 30)
retrieved 30 May 2023
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.
(News Source -Except for the headline, this story has not been edited by Times Of Nation staff and is published from a phys.org feed.)
Read Also- Latest News | Current Affairs News | Today News | English News | World News Today
TimesofNation.com offer news and information like- English newspaper today | today English news | English news live | times India | today news in English in India | breaking news in India today | India TV news today & Hindustan News.
You can Read on TimesofNation.com latest news today, breaking news headlines, Top news. Discover national and international news on economy, politics, defence, sports, world news & other relatively current affair’s news.