A Raman spectral probe on polar w-ZnS nanostructures and surface optical phonon modes in nanowires

Nanoscale ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 4948-4958 ◽  
Author(s):  
Neena Prasad ◽  
Balasubramanian Karthikeyan
Keyword(s):  
Hydrothermal Method ◽  
Optical Phonon ◽  
Phonon Modes ◽  
Surface Optical ◽  
Raman Spectral

In the present study, different morphologies of ZnS nanostructures have been synthesized through a hydrothermal method and their Raman spectral modes are investigated.

Plasmon induced enhancement of surface optical phonon modes and magnon properties of NiO nanoparticles: Raman spectral probe

2020 ◽  
Vol 22 (39) ◽  
pp. 22815-22822 ◽  
Author(s):  
Anoop Sunny ◽  
Karthikeyan Balasubramanian
Keyword(s):  
Raman Spectroscopy ◽  
Optical Phonon ◽  
Room Temperature ◽  
Nio Nanoparticles ◽  
Phonon Modes ◽  
Surface Optical ◽  
Raman Spectral

In the present work, the influence of Ag-induced plasmons on the surface optical (SO) phonon modes of NiO nanoparticles was extensively studied using room temperature Raman spectroscopy.

Micro-Raman investigation on the size effects of surface optical phonon modes in single cone-shape InGaN/GaN microrods

2020 ◽  
Vol 512 ◽  
pp. 145656
Author(s):  
Hui Liao ◽  
Peijun Wen ◽  
Guo Yu ◽  
Muhammad Saddique Akbar ◽  
Junchao Li ◽  
...  
Keyword(s):  
Optical Phonon ◽  
Size Effects ◽  
Phonon Modes ◽  
Surface Optical ◽  
Single Cone

Effects of Density and Diameter on Surface Optical Phonon Modes in GaAs Nanowire Bundles

2020 ◽  
Vol 20 (7) ◽  
pp. 4444-4449
Author(s):  
Jeung Hun Park ◽  
Richard S. Kim ◽  
Se-Jeong Park ◽  
Choong-Heui Chung
Keyword(s):  
Optical Phonon ◽  
Fill Factor ◽  
Average Diameter ◽  
Red Shift ◽  
Phonon Modes ◽  
Optical Phonon Mode ◽  
Surface Optical ◽  
Gaas Nanowire ◽  
Dielectric Continuum ◽  
Dielectric Continuum Model

We report the systematic investigation of the surface optical phonon modes in Au-catalyzed GaAs nanowires grown on an Au pre-patterned GaAs(111)B substrate using μ-Raman spectroscopy. We employed electron-beam dose rate as a control parameter during the substrate patterning step for adjusting the nanowire base diameter and coverage, which are independent from the nanowire growth conditions. We have experimentally studied the effect of the fill factor and average diameter on the surface optical phonon modes and explained the red-shift and broadening of the surface optical phonon frequencies by employing the dielectric continuum model. The surface optical phonon mode shift is exhibited to be sensitive to fill factor, rather than base diameter. The decrease in the average diameter from 280 nm to 180 nm results in the asymmetric broadening and red-shift of the surface optical phonon frequency (~1.83 cm−1) but the theoretical calculation from the isolated single nanowire-based dielectric continuum model cannot solely explain the behaviors of the surface optical phonon mode. In contrast, the change in the fill factor from 0.01 to 0.83 results in a shift of the surface optical phonon frequency (~6.5 cm−1) from the GaAs bulk value. The red-shift and asymmetric broadening of the surface optical phonons, in an agreement with the Maxwell-Garnett approximation, are consequences of dipolar interaction of randomly aligned neighboring nanowires and the polar nature of GaAs nanowire bundles. This work suggests the pre-patterning parameter dependent surface optical phonon characteristics of GaAs nanowire bundles which are of great importance in the nondestructive characterization of low-dimensional opto-electronic materials and devices.

Polarization eigenvectors of surface-optical phonon modes in a rectangular quantum wire

1990 ◽  
Vol 42 (2) ◽  
pp. 1488-1491 ◽  
Author(s):  
Michael A. Stroscio ◽  
K. W. Kim ◽  
Michael A. Littlejohn ◽  
Hsuhung Chuang
Keyword(s):  
Optical Phonon ◽  
Quantum Wire ◽  
Phonon Modes ◽  
Surface Optical

SIZE DEPENDENCE OF THE LONGITUDINAL OPTICAL AND SURFACE OPTICAL PHONON MODES IN CYLINDRICAL QUANTUM WIRES

1994 ◽  
Vol 08 (08n09) ◽  
pp. 545-551
Author(s):  
HAI-YANG ZHOU ◽  
SHI-WEI GU
Keyword(s):  
Dispersion Relation ◽  
Optical Phonon ◽  
Quantum Wire ◽  
Size Dependence ◽  
Quantum Wires ◽  
Longitudinal Optical ◽  
Phonon Modes ◽  
Surface Optical ◽  
Macroscopic Approach

With the use of the classical macroscopic approach, we have derived the longitudinal optical (LO) and surface optical (SO) phonon modes in a cylindrical quantum wire (QW). The dispersion relation of the SO phonon modes in the QW is discussed explicitly. Having quantized the vibrational eigenmodes, we give the interaction Hamiltonian of the electron with the LO and SO phonon modes in QW.

Surface optical phonon modes in hexagonal shaped Al0.97Ga0.03N nanostructures

2017 ◽  
Vol 123 (8) ◽  
Author(s):  
A. K. Sivadasan ◽  
Chirantan Singha ◽  
K. G. Raghavendra ◽  
S. Amirthapandian ◽  
A. Bhattacharyya ◽  
...  
Keyword(s):  
Optical Phonon ◽  
Phonon Modes ◽  
Surface Optical
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