Brillouin scattering in thin film optical waveguides. III. Experiments

1982 ◽  
Vol 60 (12) ◽  
pp. 1821-1837 ◽  
Author(s):  
N. L. Rowell ◽  
V. C-Y. So ◽  
R. Normandin ◽  
G. I. Stegeman
Keyword(s):  
Thin Film ◽  
Optical Waveguides ◽  
Brillouin Scattering ◽  
Planar Waveguides ◽  
Experimental Results

A series of experimental results on Brillouin scattering in thin film optical waveguides is discussed for two scattering geometries and for three types of planar waveguides. The results of these experiments are compared with the theory presented in the previous two papers.

Brillouin scattering in thin film optical waveguides. II. Scattering theory

1982 ◽  
Vol 60 (12) ◽  
pp. 1804-1820 ◽  
Author(s):  
N. L. Rowell ◽  
G. I. Stegeman
Keyword(s):  
Thin Film ◽  
General Theory ◽  
Optical Waveguide ◽  
Optical Waveguides ◽  
Scattering Theory ◽  
Brillouin Scattering ◽  
Numerical Calculations ◽  
Field Analysis ◽  
Total Field ◽  
Optical Modes

The general theory of Brillouin scattering out of the guided optical modes by the acoustic modes of a thin film optical waveguide is formulated in terms of a total field analysis which includes the effects of both the elastooptic and corrugation scattering mechanisms. The general analytical forms for the field discontinuities at the film boundaries are given and the spectral densities are evaluated for two particular radiative geometries. The results of numerical calculations for the geometries are presented.

Brillouin scattering in thin film optical waveguides. I. Theory of the phonon modes

1982 ◽  
Vol 60 (12) ◽  
pp. 1788-1803 ◽  
Author(s):  
N. L. Rowell ◽  
G. I. Stegeman
Keyword(s):  
Thin Film ◽  
Density Of States ◽  
Optical Waveguides ◽  
Thick Plate ◽  
Brillouin Scattering ◽  
Thermal Fluctuations ◽  
Reflection Coefficients ◽  
Phonon Modes ◽  
Bulk Waves

The phonon modes of a thick plate and a thick plate coated with a thin film are discussed in the light of recent experiments on Brillouin scattering in thin film optical waveguides. Using the reflection coefficients for bulk waves, we have obtained the field structures, the mode normalization for excitation by thermal fluctuations, and the density of states for these modes. Both bulk and surface (Rayleigh, Sezawa, and Love) phonons are discussed.

Synthesis of Nanocomposite thin film Ti/Al Multilayers and Ti-Aluminides

1996 ◽  
Vol 457 ◽  
Author(s):  
R. Banerjee ◽  
X. D. Zhang ◽  
S. A. Dregia ◽  
H. L. Fraser
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Magnetron Sputtering ◽  
Layer Thickness ◽  
Thermodynamic Model ◽  
Interfacial Reactions ◽  
Experimental Results ◽  
Structural Transitions ◽  
Nanocomposite Thin Film ◽  
Multilayered Thin Films

ABSTRACTNanocomposite Ti/Al multilayered thin films have been deposited by magnetron sputtering. These multilayers exhibit interesting structural transitions on reducing the layer thickness of both Ti and Al. Ti transforms from its bulk stable hep structure to fee and Al transforms from fee to hep. The effect of ratio of Ti layer thickness to Al layer thickness on the structural transitions has been investigated for a constant bilayer periodicity of 10 nm by considering three different multilayers: 7.5 nm Ti / 2.5 nm Al, 5 nm Ti / 5 nm Al and 2.5 nm Ti / 7.5 nm Al. The experimental results have been qualitatively explained on the basis of a thermodynamic model. Preliminary experimental results of interfacial reactions in Ti/Al bilayers resulting in the formation of Ti-aluminides are also presented in the paper.

Experimental Study on the Failure Criterion for Brittle Materials in Compression

2011 ◽  
Vol 320 ◽  
pp. 259-262
Author(s):  
Xu Ran ◽  
Zhe Ming Zhu ◽  
Hao Tang
Keyword(s):  
Thin Film ◽  
Experimental Study ◽  
Compressive Strength ◽  
Fracture Mechanics ◽  
Failure Criterion ◽  
Brittle Materials ◽  
Experimental Results ◽  
Experiment Study ◽  
Confining Stress ◽  
Theoretical Results

The mechanical behavior of multi-cracks under compression has become a very important project in the field of fracture mechanics and rock mechanics. In this paper, based on the previous theoretical results of the failure criterion for brittle materials under compression, experiment study is implemented. The specimens are square plates and are made of cement, sand and water, and the cracks are made by using a very thin film (0.1 mm). The relations of material compressive strength versus crack spacing and the lateral confining stress are obtained from experimental results. The experimental results agree well with the failure criterion for brittle materials under compression, which indicates that the criterion is effective and applicable.

scholarly journals Impurity Diffusion in Lithium

1970 ◽  
Vol 25 (10) ◽  
pp. 1477-1483 ◽  
Author(s):  
Aadu Ott
Keyword(s):  
Thin Film ◽  
Impurity Atom ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Impurity Diffusion ◽  
Experimental Results ◽  
Vacancy Mechanism ◽  
Lithium Metal ◽  
Qualitative Explanation ◽  
Sectioning Method

Abstract The diffusion of 115mCd, 203Hg and 72Ga tracers in lithium metal has been studied, using a thin film deposition and sectioning method.The experimental results can be expressed by the following Arrhenius relations:These results, which do not agree with any established theory of impurity diffusion in a metallic lattice, are discussed together with data from previous experiments in terms of the systematics of the dependence of the diffusivity on the "ionizability" of an impurity atom in Li, and on the size of the impurity. In this way a qualitative explanation of the different diffusions rates can be obtained. The relatively large and electropositive impurities appear to diffuse mainly via a vacancy mechanism and the small and electronegative ones mainly as interstitials. The distinction substitutional-interstitial is less pronounced for very large impurities, which may also exhibit tendencies to be trapped at lattice defects.

An Ultrafast Vitrification Method for Cell Cryopreservation

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Fengmin Su ◽  
Nannan Zhao ◽  
Yangbo Deng ◽  
Hongbin Ma
Keyword(s):  
Thin Film ◽  
Cooling Rate ◽  
Experimental Results ◽  
Low Concentration ◽  
Temperature Range ◽  
Thin Film Evaporation ◽  
Film Evaporation ◽  
A Cell ◽  
Cryoprotective Solution ◽  
Ultrafast Cooling

Ultrafast cooling is the key to successful cell vitrification cryopreservation of lower concentration cryoprotective solution. This research develops a cell cryopreservation methodology which utilizes thin film evaporation and achieves vitrification of relatively low concentration cryoprotectant with an ultrafast cooling rate. Experimental results show that the average cooling rate of dimethylsulfoxide (DMSO) cryoprotective solution reaches 150,000 °C/min in a temperature range from 10 °C to −180 °C. The ultrafast cooling rate can remarkably improve the vitrification tendencies of the cryoprotective solution. This methodology opens the possibility for more successful cell vitrification cryopreservation.

Cerium dioxide thin film optical waveguides

1992 ◽  
Vol 24 (5) ◽  
pp. 263-266 ◽  
Author(s):  
P.F. Wahid ◽  
K.B. Sundaram ◽  
P.J. Sisk
Keyword(s):  
Thin Film ◽  
Optical Waveguides ◽  
Cerium Dioxide

scholarly journals SRS characteristics and its influence on SBS pulse compression in a fluorocarbon liquid

2017 ◽  
Vol 35 (1) ◽  
pp. 114-119 ◽  
Author(s):  
H. Yuan ◽  
Y. Wang ◽  
Z. Lu ◽  
Z. Liu ◽  
Z. Bai ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Pulse Compression ◽  
Laser Intensity ◽  
Stimulated Raman Scattering ◽  
Brillouin Scattering ◽  
Laser System ◽  
Experimental Results ◽  
Frequency Shifts ◽  
Experimental Medium ◽  
Stimulated Brillouin

AbstractIn this paper, the occurrence of the stimulated Raman scattering (SRS) and its effects on stimulated Brillouin scattering (SBS) pulse compression in FC-40 are investigated. As the experimental medium, the characteristics of FC-40 are suitable for pulse compression. Firstly, the frequency shifts and the threshold of SRS in FC-40 are studied with a mode-locked laser system as pump source, without taking the SBS effect into account. On the basis of the experimental results, the competition between SRS and SBS as well as its effect on pulse compression is investigated. Results show that SRS gets higher gain and grows rapidly with the increase of the laser intensity by pump effect, which will result in decreasing of SBS energy reflection.

Polyaniline thin film optical waveguides for integrated optics and VLSI prepared by vacuum evaporation technique

2002 ◽  
Vol 13 (6) ◽  
pp. 475-480 ◽  
Author(s):  
R. P. Sharma ◽  
M. S. Raghuvanshi ◽  
S. V. Bhavsar ◽  
A. R. Patil ◽  
S. C. K. Misra
Keyword(s):  
Thin Film ◽  
Integrated Optics ◽  
Optical Waveguides ◽  
Vacuum Evaporation ◽  
Evaporation Technique ◽  
Vacuum Evaporation Technique

Brillouin scattering in planar waveguides. I. Numerical model

2003 ◽  
Vol 94 (8) ◽  
pp. 4876 ◽  
Author(s):  
A. Chiasera ◽  
M. Montagna ◽  
F. Rossi ◽  
M. Ferrari
Keyword(s):  
Numerical Model ◽  
Brillouin Scattering ◽  
Planar Waveguides
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