Light Scattering in Solids IX

Cardona, M.; Merlín, R.

doi:10.1007/978-3-540-34436-0_1

Cited by 115 publications

(173 citation statements)

References 22 publications

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“…These modes could be assigned to the shear mode in analogy to that in graphite according to their frequency regions. [35] Their frequency is prominently lower than that (43.5 cm −1 ) in -50 -25 0 25 50…”

Section: Resultsmentioning

confidence: 81%

Ultralow-frequency shear modes of 2-4 layer graphene observed in scroll structures at edges

Tan

Han

et al. 2014

Phys. Rev. B

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The in-plane shear modes between neighbor-layers of 2-4 layer graphenes (LGs) and the corresponding graphene scrolls rolled up by 2-4LGs were investigated by Raman scattering. In contrast to that just one shear mode was observed in 3-4LGs, all the shear modes of 3-4LGs were observed in 3-4 layer scrolls (LSs), whose frequencies agree well with the theoretical predication by both a force-constant model and a linear chain model. In comparison to the broad width (about 12cm −1 ) for the G band in graphite, all the shear modes exhibit an intrinsic line width of about 1.0 cm −1 .The local electronic structures dependent on the local staking configurations enhance the intensity of the shear modes in corresponding 2-4LSs zones, which makes it possible to observe all the shear modes. It provides a direct evidence that how the band structures of FLGs can be sensitive to local staking configurations. This result can be extended to n layer graphene (n > 4) for the understanding of the basic phonon properties of multi-layer graphenes. This observation of all-scale shear modes can be foreseen in other 2D materials with similar scroll structures.

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Section: Resultsmentioning

confidence: 81%

Ultralow-frequency shear modes of 2-4 layer graphene observed in scroll structures at edges

Tan

Han

et al. 2014

Phys. Rev. B

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“…This is in agreement with the Raman selection rules: in crystals of zinc blende structure only LO phonons are allowed in backscattering from the (001) surface. 4 GaSb LO phonons are weaker and broader due to the smaller thickness of GaSb layers in the SLs. (The SL thickness is much larger than the penetration depth of the laser light, therefore the substrate signal is suppressed in the spectra from the unetched region.)…”

Section: Raman Spectroscopy Of Fpa Sidewallsmentioning

confidence: 99%

Confocal Raman spectroscopy and AFM for evaluation of sidewalls in type II superlattice FPAs

et al. 2015

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We propose to utilize confocal Raman spectroscopy combined with high resolution atomic force microscopy (AFM) for nondestructive characterisation of the sidewalls of etched and passivated small pixel (24 µm×24 µm) focal plane arrays (FPA) fabricated using LW/LWIR InAs/GaSb type-II strained layer superlattice (T2SL) detector material. Special high aspect ratio Si and GaAs AFM probes, with tip length of 13 µm and tip aperture less than 7 • , allow characterisation of the sidewall morphology. Confocal microscopy enables imaging of the sidewall profile through optical sectioning. Raman spectra measured on etched T2SL FPA single pixels enable us to quantify the non-uniformity of the mesa delineation process.

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“…Depending of the target material structure, composition, and the light-matter interaction type such as direct absorption, transmission, emission of scattering (type Rayleigh, Brillouin, Raman) one can summarize the classical spectroscopy methods as follow [5][6][7][8][9][10][11].  Atomic spectroscopy:…”

Section: Fig 1 a General Scheme Of A Monochromatormentioning

confidence: 99%

“…Electron spectroscopy:  Auger electron spectroscopy (AES)  X-ray photoelectron spectroscopy (XPS, ESCA)  Infrared spectroscopy  molecular spectroscopy  near infrared absorption spectroscopy (NIR)  ultraviolet and visible spectroscopy (UV-VIS)  Nuclear and electron spectroscopy  electron paramagnetic resonance spectroscopy (EPR, ESR)  nuclear magnetic resonance spectroscopy (NMR)  Fourier transform spectroscopy (FT)  Laser spectroscopy  laser-induced fluorescence spectroscopy (LIF)  Raman spectroscopy (RAMAN)  resonance ionization spectroscopy (RIS)  X-ray and -ray spectroscopies  Mossbauer spectroscopy (MOSSBAUER)  Newton activation analysis spectroscopy (NAA)  X-ray fluorescence spectroscopy (XRF)  extended X-ray absorption fine structure (EXAFS) and numerous other combined type spectroscopic methods [7][8].…”

Section: Fig 1 a General Scheme Of A Monochromatormentioning

confidence: 99%

“…It is very important that the duration of the laser pulses must be shorter than the time scale of the dynamics that one wants to observe. Taking into account the quantum mechanical considerations we reach the appearance of uncertainty principle e.g., time and energy resolution are related to each other through the Fourier transformation [7].…”

Section: Ultrafast Spectroscopymentioning

confidence: 99%

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