Phonon-plasmon modes in small GaN crystals

Ruppin, R.; Nahum, J.

doi:10.1016/s0022-3697(74)80156-3

Cited by 28 publications

(13 citation statements)

References 17 publications

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“…It is obviously revealed in the IR spectrum that there is some water in the GaP nanoparticles which is absorbed from the atmosphere and that there exist a certain number of oxygen atoms on the surface of the GaP nanoparticles as well as in the GaP nanoparticles because the GaP nanoparticles are oxidized when prepared or exposed to the air. The appearance of the strong transmission minimum (absorption peak) at 372 cm −1 brings in mind the results reported by Yamamoto et al [32] and Ruppin et al [33] who have observed lowfrequency far IR peaks resulting from the surface modes of spheroid particles. Thus, we assign the peak at 372 cm −1 to SO mode absorption.…”

Section: Analysis Of Uv-vis Absorption Rs and Ftir Transmission Spectrasupporting

confidence: 60%

Fast Optical Recording of Polarization Holographic Grating Based on an Azo-Dye-Doped Polymer-Ball-Type Polymer-Dispersed Liquid Crystal Film

Fuh

Lee

Cheng

2003

Jpn. J. Appl. Phys.

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Gallium phosphide (GaP) nanoparticles were synthesized by reacting GaCl 3 with Na 3 P in xylene. An electron spin resonance spectrum attributed to the Ga self-interstitial (Ga i ) defect in GaP nanoparticles was observed with factor g = 2.0028. From the ultraviolet and visible (UV-vis) spectrum it is inferred that GaP nanoparticles exhibit a direct transition and an indirect transition, and the blue-shifted band gaps are ascribed to the Ga i defect as well as the nanosize effect. In the Raman spectrum the transverse optical and longitudinal optical peaks have slight red shifts, which are attributed to the intrinsic impurities or defects in GaP nanoparticles. The Raman and infrared spectra both indicate that the surface optical (SO) phonon mode occurs in GaP nanoparticles. The SO mode originates from the defects on the surface of GaP nanoparticles. The optical properties associated with intrinsic defects hold promise for some potential applications in future nanodevices.

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Section: Analysis Of Uv-vis Absorption Rs and Ftir Transmission Spectrasupporting

confidence: 60%

Fast Optical Recording of Polarization Holographic Grating Based on an Azo-Dye-Doped Polymer-Ball-Type Polymer-Dispersed Liquid Crystal Film

Fuh

Lee

Cheng

2003

Jpn. J. Appl. Phys.

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“…Figures 3 and 4 Now let us look at the origin of these FIR platform peaks of samples A and B. The appearance of the low-frequency FIR platform peaks brings to mind the results reported by Fuchs et al, 22 Yamamoto et al, 23 Ruppin et al, 24,25 and Luxon et al, 26 who have observed low-frequency FIR platform peaks resulting from the surface modes of cylindrical and spheroid particles. These pioneers have theoretically and experimentally studied these FIR platform peaks.…”

Section: Far-infrared Absorption Spectra and Properties Of Sno 2 Nanomentioning

confidence: 86%

Far-infrared absorption spectra and properties of SnO2 nanorods

Liu

Dong

Wang

2003

Applied Physics Letters

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Gray-colored materials synthesized by calcining the precursor powders, which were produced in a microemulsion, are identified to be rutile structured SnO2 nanorods 20–45 nm in diameter and several micrometers in length by x-ray diffraction, transmission with electron microscopy, and high-resolution transmission microscopy. Conspicuous far-infrared (FIR) absorption spectrum platform peaks with widths of up to 61.6 and 119 cm−1 are observed, and are explained as the overlap of the surface modes of cylindrical and spheroid particles. Good agreement is achieved between FIR platform peaks and calculated results.

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“…Furthermore, the theory assumes spherical particles, whereas the microcrystals of the CdO sample are mainly of cubic shape. Ruppin and Nahum (1974) have also observed the coupled modes of small GaN crystals about 3 ym in size and the results were interpreted by the Mie theory. However, there were no observations of clearly separated, two coupled surface-phonon-surface-plasmon modes, which are expected from the theory, and no discussion of a shape effect of these materials.…”

Section: Introductionmentioning

confidence: 86%

Electron state density and anomalies in the electronic and lattice properties of metals and alloys

Katsnelson¹,

Trefilov²

1988

Sov. Phys. Usp.

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The infrared transmission spectra of small GaAs crystals (0.5 pm in average size) are reported. The samples are produced by mechanical grinding down from the bulk crystals with known carrier concentrations from 5.3 x lo" to 2.4 x 10'8cm-3. The spectrum is constructed from a surface phonon mode and coupled modes between surface phonons and plasmons. The two coupled modes are clearly separated and their frequencies agree very well with the theoretical dispersion curves. On the basis of the theory of an average dielectric function, the observed spectra are reproduced from the calculations, in which the particle is assumed to be a sphere composed of a shell with no carriers and a core containing high carrier concentration.

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Phonon-plasmon modes in small GaN crystals

Cited by 28 publications

References 17 publications

Fast Optical Recording of Polarization Holographic Grating Based on an Azo-Dye-Doped Polymer-Ball-Type Polymer-Dispersed Liquid Crystal Film

Fast Optical Recording of Polarization Holographic Grating Based on an Azo-Dye-Doped Polymer-Ball-Type Polymer-Dispersed Liquid Crystal Film

Far-infrared absorption spectra and properties of SnO2 nanorods

Electron state density and anomalies in the electronic and lattice properties of metals and alloys

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