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We have studied Smith Purcell radiation (SPR) as the one of solutions to emit high frequency electro magnetic wave. The SPR is a kind of mechanism of spontaneous emission, which consists of an accelerated electron beam and interaction metal circuit. Spontaneous emission emits from electric dipole in SPR and the output power is very weak. In order to increase radiation power, using short pulse is one...
To improve QE of the photocathode using surface plasmon resonance, we have employed the new arrangement of the photocathode and incident light, where the direction of the surface plasmon coincides with the momentum direction of the emitting electrons. We have achieved the QE by 103 times larger than that of the conventional photocathode using surface plasmon resonance.
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