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High Quantum Efficiency Photocathode Using Surface Plasmon Resonance

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dc.contributor.author MIMURA, Hidenori
dc.contributor.author YOICHIRO, Neo
dc.contributor.author TORU, Aoki
dc.contributor.author TAKAHIRO, Matsumoto
dc.date.accessioned 2020-05-12T13:48:49Z
dc.date.available 2020-05-12T13:48:49Z
dc.date.issued 2015
dc.identifier.citation MIMURA, Hidenori, YOICHIRO, Neo, TORU, Aoki et al. High Quantum Efficiency Photocathode Using Surface Plasmon Resonance. In: ICNMBE: International conference on Nanotechnologies and Biomedical Engineering: proc. of the 3rd intern. conf., Sept. 23-26 : Program & Abstract Book , 2015. Chişinău, 2015, p. 50. en_US
dc.identifier.uri http://repository.utm.md/handle/5014/8150
dc.description Abstract en_US
dc.description.abstract Super-radiant Smith-Purcell radiation using a pre-bunched electron beam is a very attractive terahertz light source because it does not require an extremely high initial current density. In order to modulate an electron beam in terahertz region, the metal photocathode excited by deep ultraviolet (DUV) laser is a promising candidate because of its fast response time less than 10–12 sec. However, the photocathode has low quantum efficiency (QE) of the order of 10–4. This is because reflectance at the metal surface is relatively high and electrons excited inside the metal by laser light suffers electron- electron scattering before escaping into vacuum. To overcome such problems, we have proposed the photocathode using surface plasmon resonance and investigated the emission properties. The surface plasmon resonance reduces light reflection to zero because all incident photons are absorbed by surface plasmon at the resonance angle. Consequently, all the incident photon energy is transferred to surface plasmon. The electrons excited in surface plasmon do not need to travel inside the metal before escaping into vacuum, because the evanescent wave couples with surface plasmon just at the interface between vacuum and the metal film. To drastically improve QE, it is quite import that the direction of the momentum of plasmon have to agree with the direction of e emitting electrons. We have achieved the QE 103 times larger than the previous value. en_US
dc.language.iso en en_US
dc.publisher Tehnica UTM en_US
dc.rights Attribution-NonCommercial-NoDerivs 3.0 United States *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/us/ *
dc.subject super-radiant radiation en_US
dc.subject light sources en_US
dc.subject plasmon resonance en_US
dc.subject photon energy en_US
dc.title High Quantum Efficiency Photocathode Using Surface Plasmon Resonance en_US
dc.type Article en_US


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