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Direct observation of inner and outer G′ band double-resonance Raman scattering in free standing graphene
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10.1063/1.4729407
/content/aip/journal/apl/100/24/10.1063/1.4729407
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/24/10.1063/1.4729407
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Figures

Image of FIG. 1.
FIG. 1.

(a) An optical image of the free standing graphene sample; (b) Raman spectra of the free standing graphene and the graphene on SiO2/Si substrate (excitation energy is 2.33 eV); (c) Lorentzian fitting of G′ band of the free standing graphene; and (d) energy dispersion of the G′ subbands of the free standing graphene.

Image of FIG. 2.
FIG. 2.

The outer (a) and inner (b) scattering processes of G′ band. The influence of trigonal warping effect on the outer and inner processes is illustrated in (c) for low energy level and (d) for high energy level. The outer scattering process is in black lines, and the inner scattering process is in red lines.

Image of FIG. 3.
FIG. 3.

Polarized G′ band Raman spectra of the free standing graphene. The incident laser beam is in a fixed polarization and the polarization angles of the analyzer respect to incident polarization are 0° and 90°. The excitation energies are 1.58 eV for (a) and (b), and 3.49 eV for (c) and (d), respectively.

Image of FIG. 4.
FIG. 4.

Polarized Raman spectra of the free standing graphene under excitation of 1.96 eV.

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/content/aip/journal/apl/100/24/10.1063/1.4729407
2012-06-14
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Direct observation of inner and outer G′ band double-resonance Raman scattering in free standing graphene
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/24/10.1063/1.4729407
10.1063/1.4729407
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