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Optical magnetic lens: towards actively tunable terahertz optics
Georgii Shamuilov1, Katerina Domina, Vyacheslav Khardikov
1Department of Physics and Astronomy, Uppsala University, Lägerhyddsvägen 1, Uppsala, 75120, Sweden. vitaliy.goryashko@physics.uu.se.
Nanoscale
|November 16, 2020
Summary
We introduce a tunable Optical Magnetic Lens (OML) using magneto-optical materials. This lens offers dynamic focal length control for applications in ultrafast electron beam shaping and 3D microscopy.
Area of Science:
- Optics and Photonics
- Materials Science
- Magneto-optics
Background:
- Dynamic focal length adjustment is crucial for various optical applications.
- Current tunable flat lenses (metasurfaces) have limited dynamic tunability due to fixed geometry.
- Compact and tunable optical components are highly sought after.
Purpose of the Study:
- To propose and investigate a novel tunable Optical Magnetic Lens (OML) concept.
- To explore the dynamic tunability of focal length using magneto-optical materials.
- To assess the potential applications of OML across different frequency ranges.
Main Methods:
- Conceptualized an Optical Magnetic Lens (OML) utilizing a subwavelength-thin magneto-optical material layer.
- Employed a non-uniform magnetic field to focus photon beams.
- Investigated the OML concept across a broad frequency spectrum (microwaves to visible light).
Main Results:
- Demonstrated the OML effect across a wide frequency range.
- Achieved 50% relative tunability of focal length on the picosecond timescale for terahertz light.
- Identified OML applicability in both natural bulk and 2D magneto-optical materials.
Conclusions:
- The proposed Optical Magnetic Lens offers significant dynamic tunability.
- OML is particularly promising for ultrafast electron beam shaping in microscopy.
- Potential applications include 3D optical microscopy and charged particle beam acceleration.
