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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Multi-plane imaging based on cascade spintronic terahertz emitters with curved substrates
Optics Express
|November 14, 2024
Summary
Researchers developed novel spintronic terahertz emitters (STEs) using curved substrates to control terahertz wave fronts. This innovation enables focusing terahertz radiation and generating vortex beams for advanced imaging and optospintronic devices.
Area of Science:
- Terahertz (THz) science and technology
- Spintronics
- Optics and photonics
Background:
- Spintronic terahertz emitters (STEs) are emerging as powerful, scalable THz sources.
- Optimizing STE performance requires advancements in heterostructure design and accessories.
- Controlling the terahertz wave front is a new frontier for STE applications.
Purpose of the Study:
- To introduce curved substrates for modulating the terahertz wave front from STEs.
- To demonstrate the focusing capability of STEs using a neutral-meniscus substrate.
- To generate and apply coaxial THz bi-focus for multi-plane imaging and create THz vortex beams.
Main Methods:
- Designed and fabricated STEs with neutral-meniscus and spiral stair substrates.
- Utilized cascade STEs for multi-plane imaging of amplitude- and phase-type objects.
- Analyzed focused and defocused regions of samples on different cross-sections.
Main Results:
- Achieved focusing of emitted THz radiation using a neutral-meniscus substrate STE.
- Generated coaxial THz bi-focus with non-overlapping spatio-temporal distribution.
- Successfully produced a THz vortex beam using a spiral stair substrate STE.
Conclusions:
- Curved substrates offer a new degree of freedom for controlling THz wave front modulation.
- The developed STEs enable advanced applications like multi-plane imaging and THz vortex beam generation.
- This approach expands possibilities for developing novel THz optospintronic devices.
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