Carbon Nanotubes as an Ultrafast Emitter with a Narrow Energy Spread at Optical Frequency

Li, Chi; Zhai, Feng; Li, Zhenjun; Yao, Fengrui; Qiao, Ruixi; Chen, Ke; Cole, Matthew T.; Yu, Dapeng; Sun, Zhipei; Dai, Qing

doi:10.1002/adma.201701580

Cited by 34 publications

(32 citation statements)

References 31 publications

(52 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Following the same procedure on data taken from Ref. [47] we show that the extracted value of α parameter is 1, so the classical FN equation seems valid in this case. Finally, Fig.…”

Section: Fractional Generalization Of Fowler-nordheim Field Emissmentioning

confidence: 60%

Fractional Fowler–Nordheim Law for Field Emission From Rough Surface With Nonparabolic Energy Dispersion

Zubair

Ang

2018

IEEE Trans. Electron Devices

View full text Add to dashboard Buy / Rent full text

The theories of field electron emission from perfectly planar and smooth canonical surfaces are well understood, but they are not suitable for describing emission from rough, irregular surfaces arising in modern nanoscale electron sources. Moreover, the existing models rely on Sommerfeld's free-electron theory for the description of electronic distribution which is not a valid assumption for modern materials with nonparabolic energy dispersion. In this paper, we derive analytically a generalized Fowler-Nordheim (FN) type equation that takes into account the reduced space-dimensionality seen by the quantum mechanically tunneling electron at a rough, irregular emission surface. We also consider the effects of non-parabolic energy dispersion on field-emission from narrow-gap semiconductors and few-layer graphene using Kane's band model. The traditional FN equation is shown to be a limiting case of our model in the limit of a perfectly flat surface of a material with parabolic dispersion. The fractional-dimension parameter used in this model can be experimentally calculated from appropriate current-voltage data plot. By applying this model to experimental data, the standard field-emission parameters can be deduced with better accuracy than by using the conventional FN equation.

show abstract

“…Following the same procedure on data taken from Ref. [47] we show that the extracted value of α parameter is 1, so the classical FN equation seems valid in this case. Finally, Fig.…”

Section: Fractional Generalization Of Fowler-nordheim Field Emissmentioning

confidence: 60%

Fractional Fowler–Nordheim Law for Field Emission From Rough Surface With Nonparabolic Energy Dispersion

Zubair

Ang

2018

IEEE Trans. Electron Devices

View full text Add to dashboard Buy / Rent full text

show abstract

“…Generation of strong-field tunneling emission has been recently demonstrated in an SWNT system, which had an ultra-small tip radius of~1 nm, using nearinfrared (820 nm) and near UV (410 nm) fs lasers (Figure 9(a)) [123]. Although vertically aligned SWNT bundles were used, a few isolated, individual SWNTs protruded out of the as-grown cluster, which were believed to be the main photoemission sites with high field enhancement.…”

Section: B Ultrashort Photoemission In Swnt With a Narrow Bandwidthmentioning

confidence: 99%

“…In particular, CNTs have been extensively investigated as alternative thermionic emitters. A Keldysh parameter of 0.67 has been recently demonstrated by irradiating fs laser pulses with a wavelength of 820 nm on CNTs, as mentioned above [123]. While CNTs have proven to be the most efficient materials for field emission devices, a scalable process for precise selection and placement for CNTs has not yet been established.…”

Section: Strong-field Photoemission In Graphenementioning

confidence: 99%

Ultrashort field emission in metallic nanostructures and low-dimensional carbon materials

Park

Ahn

2020

Advances in Physics: X

View full text Add to dashboard Buy / Rent full text

This study investigates recent advances in photoelectron emission generated by irradiating ultrashort lasers on metallic nanostructures and low-dimensional carbon materials. Recently, primary focus has been on improving the efficiency of emitters, i.e. increasing the number of field-emitted electrons and their respective kinetic energies. An example of this is the modification of the conventional metal nanotip through adiabatic nanofocusing and various plasmonic metal structures, such as nanorods and bowtie antenna. The coherent emission control with two color irradiation enabled modulation in the emission yield. In addition, THz waves near the metallic nanostructure induced a highly accelerated, monochromatic energy. Alternative to metallic nanotips, carbon nanotubes are emerging as efficient photoelectron emitters, due to the large enhancement factor associated with their high aspect ratio and damage threshold. They particularly allowed the use of femtosecond light sources with a relatively short wavelength, resulting in the generation of photoelectrons with a narrow bandwidth. Additionally, electronic control over the singlewalled nanotubes band structure added a degree of freedom for controlling the electron emission yield. Finally, we review the strong-field tunneling emission in graphene edge, with the emission yield showing an anomalous increase of nonlinear order, corresponding to the deep strong tunneling regime.

show abstract

“…Based on Fowler-Nordheim (F-N) theory, electron emission from electron dense surfaces under intense electric fields has been used to investigate the electron-emission behavior of various materials [ 27 , 28 , 29 ]. Though the degree of its validity at nanoscale remains unclear, it does, nonetheless, coarsely approximate the field emission current ( I ) as a function of the applied electric field ( E ), which can be expressed as [ 30 ]:

where

is the emission area,

is the field enhancement factor,

is the working function and E (= V / d ) is the applied electric field. d is the cathode to anode distance.…”

Section: Design and Theoretical Analysismentioning

confidence: 99%

A Graphene-Coated Mo Tip Array for Highly-Efficient Nanostructured Electron Field Emitters

Zhu

Chen

Deng³

et al. 2017

Micromachines

View full text Add to dashboard Buy / Rent full text

An efficient electron field emitter based on a monolayer graphene coated well aligned Mo tip array has been designed, fabricated, and evaluated. The advantages of this hybrid nanostructure film morphology are explored and discussed. Efficient and stable field emissions with low turn-on fields have been observed with the new devices. It is further found that the combination of graphene and Mo tip array leads to significant improvements in efficiency for the nanoscale heterostructure emitters.

show abstract

Carbon Nanotubes as an Ultrafast Emitter with a Narrow Energy Spread at Optical Frequency

Cited by 34 publications

References 31 publications

Fractional Fowler–Nordheim Law for Field Emission From Rough Surface With Nonparabolic Energy Dispersion

Fractional Fowler–Nordheim Law for Field Emission From Rough Surface With Nonparabolic Energy Dispersion

Ultrashort field emission in metallic nanostructures and low-dimensional carbon materials

A Graphene-Coated Mo Tip Array for Highly-Efficient Nanostructured Electron Field Emitters

Contact Info

Product

Resources

About