Thickness dependence of magneto-optical properties in face-centered-cubic Co/Cu(001) ultrathin films

1996 ◽  
Vol 79 (8) ◽  
pp. 4977 ◽  
Author(s):  
K. Nakajima ◽  
T. Miyazaki
Keyword(s):  
Optical Properties ◽  
Ultrathin Films ◽  
Thickness Dependence ◽  
Face Centered Cubic ◽  
Face Centered

Optical properties and carrier dynamics of ensembles of InP nanowires grown on non-single-crystal platforms

2009 ◽  
Vol 1178 ◽  
Author(s):  
Takehiro Onishi ◽  
Andrew J. Lohn ◽  
Nobuhiko P. Kobayashi
Keyword(s):  
Optical Properties ◽  
Single Crystal ◽  
Quartz Substrate ◽  
Chemical Vapor ◽  
Blue Shift ◽  
Growth Direction ◽  
Longitudinal Optical ◽  
Face Centered Cubic ◽  
Single Crystal Surfaces ◽  
Face Centered

AbstractOptically active InP nanowires were grown on a quartz substrate covered with a layer (100 nm) of hydrogenated amorphous silicon (a-Si:H) by metalorganic chemical vapor deposition (MOCVD), demonstrating that single-crystal semiconductor nanowires can be formed on non-single-crystal surfaces. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, cathodoluminescence (CL), and photoluminescence (PL) were used to characterize the structural and optical properties of the nanowires. The nanowires on a-Si:H grew in random directions with high density. The XRD suggests that nanowires having either hexagonal-close-packed or face-centered cubic lattices co-exist. The Raman spectrum shows peaks associated with transverse optical (TO) and longitudinal optical (LO) branches of InP. The CL intensity does not vary signi?cantly along the growth direction and appears to be originated from the entire structure of the nanowire when probed at various positions. The CL data suggests that recombination is slow enough to allow the carriers to diffuse the complete length of the nanowires (˜2 m in length) before recombining. The PL spectrum suggested the nanowire had a part that contributes to the observed blue shift while the other part had nearly bulk feature in their structure.

scholarly journals Hydrothermal Synthesis and Optical Properties of Undoped and \(\text{Eu}^{3+}\)-doped Zinc Stannate Nanocrystals

2016 ◽  
Vol 25 (4) ◽  
pp. 327 ◽  
Author(s):  
Nguyen Duy Thien ◽  
Nguyen Ngoc Tu ◽  
Ngo Nhu Viet ◽  
Nguyen Duy Phuong ◽  
Le Van Vu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Emission Spectra ◽  
Molar Ratio ◽  
Face Centered Cubic ◽  
Excitation Spectra ◽  
Cubic Crystal ◽  
Zinc Stannate ◽  
Scattering Spectra ◽  
Hydrothermal Approach ◽  
Face Centered

Abstract. In this work we report a hydrothermal approach for synthesis of zinc stannate (Zn2SnO4)nanocrystals. Our research focused on the effect of the molar ratio of initial chemicals, reaction temperature and reaction duration on the phase composition and the fluorescence properties.Structural and optical properties of the final products were investigated in detail. X-ray diffractionanalysis indicated that the Zn2SnO4 nanocrystals possess face-centered cubic crystal structure.Raman scattering spectra exhibit two characteristic vibrational modes of Zn2SnO4 crystals. Optical band gap of Eu3+-doped Zn2SnO4 nanocrystals obviously depends on Eu3+content. Theroom-temperature emission spectra of the undoped Zn2SnO4 nanocrystals show two broad bands,while the photoluminescence spectra of Eu3+-doped Zn2SnO4 nanocrystals exhibit the emissionpeaks related to the radiative intra-configurational f-f tr ansitions of Eu3+ions. The absorptiontransitions within Eu3+ions were observed both in the photoluminescence excitation spectra andin the diffuse reflection spectra.

Void nucleation in biaxially strained ultrathin films of face-centered cubic metals

2007 ◽  
Vol 90 (22) ◽  
pp. 221907 ◽  
Author(s):  
Kedarnath Kolluri ◽  
M. Rauf Gungor ◽  
Dimitrios Maroudas
Keyword(s):  
Ultrathin Films ◽  
Void Nucleation ◽  
Face Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Optical Properties of Three-Dimensional Photonic Crystal with Face-Centered-Cubic Structure

2013 ◽  
Vol 821-822 ◽  
pp. 622-625 ◽  
Author(s):  
Hong Bo Zhang ◽  
Xiao Yan Liu ◽  
Wei Dong Yu
Keyword(s):  
Optical Properties ◽  
Photonic Crystal ◽  
Incident Angle ◽  
Three Dimensional ◽  
Structural Color ◽  
Face Centered Cubic ◽  
Microsphere Size ◽  
Cubic Structure ◽  
Face Centered ◽  
Fcc Structure

Based on transfer matrix method (TMM), the model and calculation of 3-D Photonic Crystal with Face-Centered-Cubic (FCC) Structure are presented. The microsphere size, the crystal stack thickness and the incident angle have an influence on optical properties of 3-D Photonic Crystal. With the microsphere size increasing, the wavelength corresponding to the positions of PBG becomes larger causing structural color changing from blue to red. The reflectivity becomes higher and PBG is narrower when the crystal stack thickness increases. With the incident angle becoming larger, the reflectivity does not change significantly, while the wavelength corresponding to the positions of PBG becomes shorter causing structural color changing from red to blue.

scholarly journals Nonlinear optical properties of synthesized porous nanostructures PMMA via template-directed methods

2019 ◽  
Vol 13 (28) ◽  
pp. 10-18
Author(s):  
Zainab F. Al-Bawi
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Visible Region ◽  
Colloidal Crystals ◽  
Nonlinear Optical Properties ◽  
Photon Absorption ◽  
Sphere Diameter ◽  
Face Centered Cubic ◽  
Two Photon Absorption ◽  
Face Centered

Colloidal crystals (opals) made of close-packed polymethylmethacrylate (PMMA) were fabricated and grown by Template-Directed methods to obtain porous materials with well-ordered periodicity and interconnected pore systems to manufacture photonic crystals. Opals were made from aqueous suspensions of monodisperse PMMA spheres with diameters between 280 and 415 nm. SEM confirmed the PMMA spheres crystallized uniformly in a face-centered cubic (FCC) array. Optical properties of synthesized pores PMMA were characterized by UV–Visible spectroscopy. It shows that the colloidal crystals possess pseudo photonic band gaps in the visible region. A combination of Bragg’s law of diffraction and Snell’s law of refraction were used to calculate the sphere diameter. Finally, colloidal crystals were subjected to Z-scan experiment under pulsed Q-switched Nd:YAG laser illumination to characterize it for third order nonlinear optical properties. Z-scan results show the change in transmittance of a beam, and the nonlinear refractive index is n2 = 9.82787 x 10-12 (cm2/GW), while the nonlinear absorption coefficient β= 0.04673908 (cm/GW). These results were attributed to enhance the self-focusing arising from Kerr effect and the two-photon absorption.

Structure and element-specific magnetic moments of epitaxial face-centered-cubic FexNi1−x alloy ultrathin films

1999 ◽  
Vol 85 (8) ◽  
pp. 6214-6216 ◽  
Author(s):  
R. Schellenberg ◽  
H. Meinert ◽  
N. Takahashi ◽  
F. U. Hillebrecht ◽  
E. Kisker
Keyword(s):  
Ultrathin Films ◽  
Magnetic Moments ◽  
Face Centered Cubic ◽  
Face Centered
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