High‐Q Metallic Fano Metamaterial for Highly Efficient Cerenkov Lasing
Source abstract
Abstract
Abstract A high‐quality‐factor (high‐Q) metallic Fano metamaterial is demonstrated both experimentally and theoretically. This material is suitable for highly efficient Cerenkov lasing in which subwavelength metallic slits are arranged to form asymmetric unit cells. In contrast to conventional dielectric Cerenkov or Smith–Purcell devices, in the proposed device, convection electrons traverse the high‐Q metallic metamaterial. The interplay between an extremely low group velocity from the infinite transverse permittivity of the anisotropic metamaterial and the subradiant damping from a Fano‐type slit mode is shown to be responsible for the high‐Q value, which is measured to be unprecedented at 700. The resulting improvement in the Cerenkov lasing efficiency is estimated to be more than two orders of magnitude using a particle‐in‐cell simulation.
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Research context
OpenAlex topics: Metamaterials and Metasurfaces Applications · Gyrotron and Vacuum Electronics Research · Microwave Engineering and Waveguides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Center for THz‐driven Biological Systems Department of Physics and Astronomy College of Natural Science Seoul National University 1, Gwanak‐ro Gwanak‐gu Seoul 08826 South Korea
Department of Electrical and Computer Engineering Seoul National University 1, Gwanak‐ro Gwanak‐gu Seoul 08826 South Korea
Seoul‐Teracom, Inc. Advanced Institutes of Convergence Technology 145, Gwanggyo‐ro, Yeongtong‐gu Suwon‐si Gyeonggi‐do 16229 South Korea
Gyrotron Laboratory MWD Area CSIR‐Central Electronics Engineering Research Institute Pilani 333031 India
Centre for Disruptive Photonic Technologies Nanyang Technological University Singapore 637371 Singapore
Center for Atom Scale Electromagnetism Department of Physics and Astronomy College of Natural Science Seoul National University 1, Gwanak‐ro Gwanak‐gu Seoul 08826 South Korea
Funding
National Research Foundation of Korea · Office of Naval Research · Air Force Office of Scientific Research
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