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Terahertz structured light: nonparaxial Airy imaging using silicon diffractive optics

Light, science & applications, 2022-11, Vol.11 (1), p.326-326, Article 326 [Peer Reviewed Journal]

The Author(s) 2022. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;The Author(s) 2022 ;ISSN: 2047-7538 ;ISSN: 2095-5545 ;EISSN: 2047-7538 ;DOI: 10.1038/s41377-022-01007-z

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  • Title:
    Terahertz structured light: nonparaxial Airy imaging using silicon diffractive optics
  • Author: Ivaškevičiūtė-Povilauskienė, Rusnė ; Kizevičius, Paulius ; Nacius, Ernestas ; Jokubauskis, Domas ; Ikamas, Kęstutis ; Lisauskas, Alvydas ; Alexeeva, Natalia ; Matulaitienė, Ieva ; Jukna, Vytautas ; Orlov, Sergej ; Minkevičius, Linas ; Valušis, Gintaras
  • Subjects: Illumination ; Light ; Optical properties ; Optics
  • Is Part Of: Light, science & applications, 2022-11, Vol.11 (1), p.326-326, Article 326
  • Description: Abstract Structured light – electromagnetic waves with a strong spatial inhomogeneity of amplitude, phase, and polarization – has occupied far-reaching positions in both optical research and applications. Terahertz (THz) waves, due to recent innovations in photonics and nanotechnology, became so robust that it was not only implemented in a wide variety of applications such as communications, spectroscopic analysis, and non-destructive imaging, but also served as a low-cost and easily implementable experimental platform for novel concept illustration. In this work, we show that structured nonparaxial THz light in the form of Airy, Bessel, and Gaussian beams can be generated in a compact way using exclusively silicon diffractive optics prepared by femtosecond laser ablation technology. The accelerating nature of the generated structured light is demonstrated via THz imaging of objects partially obscured by an opaque beam block. Unlike conventional paraxial approaches, when a combination of a lens and a cubic phase (or amplitude) mask creates a nondiffracting Airy beam, we demonstrate simultaneous lensless nonparaxial THz Airy beam generation and its application in imaging system. Images of single objects, imaging with a controllable placed obstacle, and imaging of stacked graphene layers are presented, revealing hence potential of the approach to inspect quality of 2D materials. Structured nonparaxial THz illumination is investigated both theoretically and experimentally with appropriate extensive benchmarks. The structured THz illumination consistently outperforms the conventional one in resolution and contrast, thus opening new frontiers of structured light applications in imaging and inverse scattering problems, as it enables sophisticated estimates of optical properties of the investigated structures.
  • Publisher: London: Springer Nature B.V
  • Language: English
  • Identifier: ISSN: 2047-7538
    ISSN: 2095-5545
    EISSN: 2047-7538
    DOI: 10.1038/s41377-022-01007-z
  • Source: PubMed (Medline)
    Open Access: Nature Open Access
    ProQuest Central
    DOAJ Directory of Open Access Journals
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