Qiguang Wang, Yaqian Xu, Zhenghao Guo, Li Chen, Chunyu Huang, Wei Hu
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Integrated planar optical devices with dynamic functionalities are in high demand in the rapidly developing terahertz region. In particular, varifocal achromatic metalenses are urgently needed for biochemical discrimination imaging and nondestructive inspection. Here, a design is proposed to realize a varifocal achromatic metalens. It works on the simultaneous compensation of the diffraction dispersion of a foci‐switchable basic phase profile on the basis of a properly preset group delay of a propagation phase. The concept is demonstrated with a liquid crystal integrated silicon metalens. The major axis orientation of cylindroid meta‐atoms supplies a fixed geometric phase, the photopatterned liquid crystal provides a switchable geometric phase, and the compensation originates from the shape variation of cylindroid meta‐atoms. Both simulations and experiments verify the switchable achromatic focusing at two distinct foci (10.20 and 13.76 mm) across 1.0–1.6 THz. Dual‐depth multispectral imaging is further demonstrated with two medicaments, exhibiting its potential for nondestructive safety screening and pharmaceutical identification. The proposed strategy establishes a framework for next‐generation adaptive terahertz techniques and applications.
期刊介绍:
Laser & Photonics Reviews is a reputable journal that publishes high-quality Reviews, original Research Articles, and Perspectives in the field of photonics and optics. It covers both theoretical and experimental aspects, including recent groundbreaking research, specific advancements, and innovative applications.
As evidence of its impact and recognition, Laser & Photonics Reviews boasts a remarkable 2022 Impact Factor of 11.0, according to the Journal Citation Reports from Clarivate Analytics (2023). Moreover, it holds impressive rankings in the InCites Journal Citation Reports: in 2021, it was ranked 6th out of 101 in the field of Optics, 15th out of 161 in Applied Physics, and 12th out of 69 in Condensed Matter Physics.
The journal uses the ISSN numbers 1863-8880 for print and 1863-8899 for online publications.