Title :
Laser stimulated electron field emission at the plasmon-resonant wavelength
Author :
Iwami, Kentaro ; Iizuka, Arata ; Umeda, Norihiro
Author_Institution :
Mech. Syst. Eng., Tokyo Univ. of Agric. & Technol., Tokyo, Japan
Abstract :
Laser stimulated electron field emission from a sharp gold tip under continuous-wave (cw) laser irradiation at the plasmon-resonant wavelength are investigated. A gold-coated tungsten emitter with a tip radius of 100 nm which has the plasmon resonant wavelength at 530 nm is used. I-V characteristics of the tip under laser irradiations at 442, 532, and 633 nm were measured. TE-polarized 532-nm irradiation shows the maximum current enhancement despite its smaller photon energy and intensity compared with the irradiation at 442 nm. The current enhancement factor ranged from 13.7 to 217. The possible mechanisms of plasmon-resonant current enhancement are considered to be the effective photon absorption and photothermal effect.
Keywords :
electron field emission; gold; laser beam applications; photothermal effects; tungsten; current enhancement factor; laser stimulated electron field emission; photon absorption; photon energy; photothermal effect; plasmon-resonant wavelength; size 100 nm; wavelength 442 nm; wavelength 530 nm; wavelength 532 nm; wavelength 633 nm; Electric fields; Iron; Laser theory; Measurement by laser beam; Plasmons; Radiation effects; Surface emitting lasers; Electron-beam lithography; Field emission; Photon absorption; Photothermal effect; Plasmon resonance;
Conference_Titel :
Nano/Micro Engineered and Molecular Systems (NEMS), 2011 IEEE International Conference on
Conference_Location :
Kaohsiung
Print_ISBN :
978-1-61284-775-7
DOI :
10.1109/NEMS.2011.6017545
