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Inverse Faraday effect with plasmon beams

S Ali, J T Mendonca2011年Plasma Physics and Controlled FusionIF 2.2出版社

The angular momentum conservation equation is considered for an electron gas, in the presence of Laguerre–Gaussian (LG) plasmons propagating along the z-axis. The LG plasmons carry a finite orbital angular momentum despite longitudinal nature, which can be partly transfered to the electrons. For short timescales, such that ion motion can be neglected, plasmons primarily interact with the electrons, creating an azimuthal electric field and generating an axial magnetic field. This effect can be called an inverse Faraday effect due to plasmons. Numerically, it is found that the magnitude of the magnetic field enhances with the plasmon density or with the energy of the electron plasma waves. A comparison of the magnitudes of the axial magnetic field is made for the inverse Faraday effect excited by both plasmons and transverse photons.

日本語訳

角運動量保存則は、z軸に沿って伝播するラゲール・ガウス(LG)プラズモンの存在下での電子ガスに対して考察される。LGプラズモンは、その縦波的性質にもかかわらず有限の軌道角運動量を担い、これは電子へ部分的に伝達され得る。イオンの運動が無視できるような短い時間スケールでは、プラズモンは主に電子と相互作用し、方位角方向の電場を生成して軸方向の磁場を誘起する。この効果は、プラズモンによる逆ファラデー効果と呼ぶことができる。数値計算により、磁場の大きさはプラズモン密度または電子プラズマ波のエネルギーとともに増大することが見出される。プラズモンと横波光子の両方によって励起される逆ファラデー効果について、軸方向磁場の大きさの比較が行われる。

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