Laser tuned field emission of the carbon nanotube arrays grown on an optical fiber

Laser was coupled into an optical fiber, on which covered a layer of well-aligned carbon nanotubes（CNTs） serving as cathode, to tune the field emission of the cathode. CNT arrays as field emission cathode were synthesized by chemical vapor deposition（CVD） on a naked fiber core. When the laser was co...

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Bibliographic Details
Published inScience China. Technological sciences Vol. 57; no. 10; pp. 1936 - 1940
Main Authors Wei, XianQi, Li, Xin, Liu, WeiHua, Wang, XiaoLi
Format Journal Article
LanguageEnglish
Published Heidelberg Science China Press 01.10.2014
Subjects
Arrays
Cathodes
Chemical vapor deposition
Current density
Electric potential
Engineering
Fibers
Field emission
Lasers
Optical fibers
光纤
化学气相沉积
发射电流密度
场发射阴极
导通电压
激光调谐
生长
碳纳米管阵列
optical fiber
laser
carbon nanotubes
field emission
Online AccessGet full text
ISSN1674-7321
1869-1900
DOI10.1007/s11431-014-5630-1

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Summary:Laser was coupled into an optical fiber, on which covered a layer of well-aligned carbon nanotubes（CNTs） serving as cathode, to tune the field emission of the cathode. CNT arrays as field emission cathode were synthesized by chemical vapor deposition（CVD） on a naked fiber core. When the laser was coupled into the fiber, the turn-on voltage（Vto at a current density of 1 mA cm^-2） decreased from 1.0 to 0.9 kV and the emission current density increased from 0.83 mA cm^-2（at a 1 kV bias voltage） to 3.04 mA cm^-2 on 40 μm diameter fiber. A photon absorption mechanism is attributed to the field emission improvement. The estimated effective work function of CNT arrays on the optical fiber decrease from 4.89 to 4.29 eV. The results show the possibility of constructing a waveguide type laser modulated field emission cathode.
Bibliography:laser; field emission; carbon nanotubes; optical fiber
Laser was coupled into an optical fiber, on which covered a layer of well-aligned carbon nanotubes（CNTs） serving as cathode, to tune the field emission of the cathode. CNT arrays as field emission cathode were synthesized by chemical vapor deposition（CVD） on a naked fiber core. When the laser was coupled into the fiber, the turn-on voltage（Vto at a current density of 1 mA cm^-2） decreased from 1.0 to 0.9 kV and the emission current density increased from 0.83 mA cm^-2（at a 1 kV bias voltage） to 3.04 mA cm^-2 on 40 μm diameter fiber. A photon absorption mechanism is attributed to the field emission improvement. The estimated effective work function of CNT arrays on the optical fiber decrease from 4.89 to 4.29 eV. The results show the possibility of constructing a waveguide type laser modulated field emission cathode.
11-5845/TH
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ISSN:1674-7321
1869-1900
DOI:10.1007/s11431-014-5630-1