Silicon-based diffractive optics for structured light in nonparaxial terahertz imaging systems

Gintaras Valušis; Sergey Orlov; Rusnė Ivaškeviciute-Povilauskiene; Karolis Mundrys; Paulius Kizevicius; Ernestas Nacius; Domas Jokubauskis; Kestutis Ikamas; Alvydas Lisauskas; Linas Minkevicius

doi:10.1117/12.3031681

16 November 2024 Silicon-based diffractive optics for structured light in nonparaxial terahertz imaging systems

Gintaras Valušis, Sergey Orlov, Rusnė Ivaškeviciute-Povilauskiene, Karolis Mundrys, Paulius Kizevicius, Ernestas Nacius, Domas Jokubauskis, Kestutis Ikamas, Alvydas Lisauskas, Linas Minkevicius

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Proceedings Volume 13203, Sensors and Communication Technologies in the 1 GHz to 10 THz Band; 132030C (2024) https://doi.org/10.1117/12.3031681
Event: Security + Defence, 2024, Edinburgh, United Kingdom

Abstract

In this communication, we consider principles of design and assembling of nonparaxial THz imaging systems based on silicon diffractive optics components. The investigation is dedicated to lensless photonic setups comprising high-resistivity silicon-based DOEs such as Fresnel zone plates, Fibonacci lenses, Bessel axicons, and Airy zone plates, all fabricated from a high-resistance 500 μm thick silicon substrate by femtosecond laser ablation. The exploration underlines the significance of structuring both the illumination and light-collection schemes as well as assembly principles of silicon diffractive optical elements in compact THz imaging.

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Gintaras Valušis, Sergey Orlov, Rusnė Ivaškeviciute-Povilauskiene, Karolis Mundrys, Paulius Kizevicius, Ernestas Nacius, Domas Jokubauskis, Kestutis Ikamas, Alvydas Lisauskas, and Linas Minkevicius "Silicon-based diffractive optics for structured light in nonparaxial terahertz imaging systems", Proc. SPIE 13203, Sensors and Communication Technologies in the 1 GHz to 10 THz Band, 132030C (16 November 2024); https://doi.org/10.1117/12.3031681

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KEYWORDS

Terahertz radiation

Imaging systems

Silicon

Millimeter wave imaging

Structured light

Design

Image resolution

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