Nature has published an article “Terahertz structured light: nonparaxial Airy imaging using silicon diffractive optics”, written by our team member, researcher Ernestas Nacius, together with the team Rusnė Ivaškevičiūtė-Povilauskienė, Paulius Kizevičius, Domas Jokubauskis, Kęstutis Ikamas, Alvydas Lisauskas, Natalia Alexeeva, Ieva Matulaitienė, Vytautas Jukna, Sergej Orlov, Linas Minkevičius & Gintaras Valušis.
The authors presented results of compact silicon flat optics-based THz structured light generation and its comprehensive benchmarks of various structured nonparaxial THz illumination-Bessel-like and self-accelerating along different paths.
The results indicate not only the good performance of the devised flat optics but also herald their potential in the applications of structured THz light in imaging and inspection of the quality of 2D materials like stacked graphene layers.
As the Raman spectroscopy indicates optical characteristics of the samples are different due to the strains, doping, depletion, etc., the structured Airy THz illumination gives an additional possibility to evaluate the optical properties of stratified samples when combined with the conventional approach.
It is in sharp contrast to the Gaussian illumination, where these features are indistinguishable.
Extensive benchmarking allows us to infer that the structured light consistently outperforms the classical Gaussian beam in THz imaging in such metrics as resolution and contrast, allowing its expansion of applicability in rather complex investigation scenarios.
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