Terahertz structured light: nonparaxial Airy imaging using silicon diffractive optics

Rusnė Ivaškevičiūtė-Povilauskienė; Paulius Kizevičius; Ernestas Nacius; Domas Jokubauskis; Kęstutis Ikamas; Alvydas Lisauskas; Natalia Alexeeva; Ieva Matulaitienė; Vytautas Jukna; Sergej Orlov; Linas Minkevičius; Gintaras Valušis

doi:10.1038/s41377-022-01007-z

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Terahertz structured light: nonparaxial Airy imaging using silicon diffractive optics

Original Articles

- Terahertz structured light: nonparaxial Airy imaging using silicon diffractive optics
- Light: Science & Applications Vol. 11, Issue 12, Pages: 2909-2921(2022)
- Affiliations：
  
  1.Department of Optoelectronics, Center for Physical Sciences and Technology, Saulėtekio av. 3, Vilnius, 10257, Lithuania
  2.Department of Fundamental Research, Center for Physical Sciences and Technology, Saulėtekio av. 3, Vilnius, 10257, Lithuania
  3.Institute of Applied Electrodynamics & Telecommunications, Vilnius University, Saulėtekio av. 3, Vilnius, 10257, Lithuania
  4.CENTERA Labs., Institute of High Pressure Physics PAS, ul. Sokolowska 29/37, Warsaw, 01-142, Poland
  5.Department of Organic Chemistry, Center for Physical Sciences and Technology, Saulėtekio av. 3, Vilnius, 10257, Lithuania
  6.Institute of Photonics and Nanotechnology, Department of Physics, Vilnius University, Saulėtekio av. 3, Vilnius, 10257, Lithuania
- Author bio：
  
  Rusnė. Ivaškevičiūtė-Povilauskienė (rusne.ivaskeviciute@ftmc.lt)
- Funds：
- DOI：10.1038/s41377-022-01007-z
  CLC：
- Published：31 December 2022，
  
  Published Online：17 November 2022，
  
  Received：23 May 2022，
  
  Revised：09 September 2022，
  
  Accepted：08 October 2022
- Accepted：
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Ivaškevičiūtė-Povilauskienė, R. et al. Terahertz structured light: nonparaxial Airy imaging using silicon diffractive optics. Light: Science & Applications, 11, 2909-2921 (2022).
DOI：

Ivaškevičiūtė-Povilauskienė, R. et al. Terahertz structured light: nonparaxial Airy imaging using silicon diffractive optics. Light: Science & Applications, 11, 2909-2921 (2022). DOI： 10.1038/s41377-022-01007-z.

摘要

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.

关键词

Keywords

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