Reconstructing subwavelength resolution terahertz holographic images

Ruoxing Wang, Guanhua Ren, Zhi Ren, Jianlong Liu, Songtao Li, Xianzhong Chen, Li Li

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Abstract

Computer-generated holography typically generates terahertz (THz) holographic images with a pixel size larger than wavelength. We propose a multi-foci metalens model to reconstruct THz holographic images with subwavelength resolution. The designed devices are realized based on dielectric metasurfaces consisting of silicon micropillars with spatially variant orientations. By exploiting quasi-continuous profile of focal points as the pixels of a holographic image, a metalens can reconstruct a high-resolution target image on its focal plane. The effects of size and pitch of each sub-diffraction focal point on imaging quality and pixel resolution are discussed. The intensity distribution at each focal point indicates that the reconstructed images have subwavelength resolution. In comparison with conventional hologram designs, this design method can be used to reconstruct THz holographic images with subwavelength resolution, which have potential applications in THz communication, information security and anti-counterfeiting.
Original languageEnglish
Pages (from-to)7137-7146
Number of pages10
JournalOptics Express
Volume30
Issue number5
Early online date16 Feb 2022
DOIs
Publication statusPublished - 28 Feb 2022

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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