Observation of Optical Emission Using the Interaction between an Electron Beam and Surface Plasmons on Silver Gratings

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  • 銀回折格子上の表面プラズモンと電子ビームとの相互作用を利用した光放射の観測

Abstract

A new method of light generation using surface plasmons on metal gratings and an electron beam traveling in a vacuum was experimentally verified. A surface plasmon on metal gratings I has a wave component with a phase velocity vspp slowed down to about 1/3 of the speed of light c. When a beam of electrons with a group velocity ve travels along this surface, a surface plasmon is generated under the condition vspp=ve. This surface plasmon is converted to light by metal gratings II with different periods and output to the vacuum side as light. In the experiments, we used silver gratings I and II with period spacing of 500 nm and 1800 nm. As the electron beam accelerated to 30-40 kV travels along the vacuum/silver grating, new spontaneous emission was observed in the 2.0-1.9 μm band, which is longer than the Smith-Parcel radiation that occurred in the 1.3-1.5 μm band. This light emission was generated under the condition vspp=ve, demonstrating that the emission is a surface plasmon-associated emission.

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