Superoscillatory metalens for polarization conversion and broadband tight focusing of terahertz waves

Wu, Zhixiang; Zhu, Jiexian; Zou, Yiyang; Hu, Deng; Xiong, Lixia; Liu, Quancheng; Shang, Liping

doi:10.1016/j.optmat.2021.111924

Cited by 5 publications

(2 citation statements)

References 36 publications

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“…Wang et al achieved tight focusing of 2.52 THz radially polarized light using a silicon cylinder metalens with an NA of 0.92 [16] . Superoscillating THz metalenses with NA as high as 0.95 and 0.975 have also been proposed [17,18] . Researchers use the combination of solid and complementary hollow dielectric units combinations or sandwich units to realize the THz achromatic metalens [19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

Terahertz wide-angle metalens with nearly ideal object-image relation

Wang,

Cheng,

et al. 2024

Chin. Opt. Lett.

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Metalenses are essential components in terahertz imaging systems. However, without careful design, they show limited field of view and their practical applications are hindered. Here, a wide-angle metalens is proposed whose structure is optimized for focusing within the incident angles of ±25°. Simulation and experiment results show that the focusing efficiency, spot size, and modulation transfer function of this lens are not sensitive to the incident angle. More importantly, this wide-angle metalens follows the ideal Gaussian formula for the object-image relation, which ensures a wider field of view and better contrast in the imaging experiment.

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Section: Introductionmentioning

confidence: 99%

Terahertz wide-angle metalens with nearly ideal object-image relation

Wang,

Cheng,

et al. 2024

Chin. Opt. Lett.

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“…Thus, the polarization modulation is significant and valuable in many aspects, such as wireless communication, [1][2][3] radar cross section reduction, [4,5] and imaging. [6,7] To process polarization information as much as possible, the devices which can manipulate multiple polarization are essential. Metasurfaces have provided excellent alternatives.…”

Section: Introductionmentioning

confidence: 99%

Transmission-type reconfigurable metasurface for linear-to-circular and linear-to-linear polarization conversions

Wang¹,

Wang²,

Yan³

et al. 2022

Chinese Phys. B

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In this paper, we present an transmission-type polarization conversion metamaterial(PCM) whose functions can be dynamically switched among the linear-to-circular(LTC) and linear-to-linear(LTL) polarization conversions. The proposed PCM consists of a grating, a polarization conversion surface and a reconfigurable polarization selective surface incorporated with PIN diodes. By changing the states of diodes, the PCM can achieve the reconfigurable manipulations for incident waves. The Fabry-perot (F-P) resonances excited by the PCM contribute to the polarization conversions, which are illustrated in this paper. Moreover, through establishing the F-P-like cavity model and analyzing the electric field components of the transmitted waves, the conditions for realizing LTC polarization conversion are revealed, which can guide the construction of PCM. The prototype of PCM is fabricated and measured, which can respectively achieve LTC and LTL polarization conversions within 3.31-3.56 GHz and 2.76-4.24 GHz, the polarization conversion ratio of two functions are higher than 0.95. The measured results show agreement with the simulated ones.

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