Thesis (Ph. D. in Physics)--Vanderbilt University, Dec. 2008. / Title from title screen. Includes bibliographical references.

Thesis (Ph. D.)--Ohio State University, 2004. / Title from first page of PDF file. Document formatted into pages; contains xvii, 208 p.; also includes graphics (some col.). Includes bibliographical references (p. 189-208).

Thesis (Ph. D.)--University of Hong Kong, 1990.

Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.

The X-band FMR has been employed to investigate the angular variation of resonance Fields of DC sputtered Co-Cr Films with different substrate temperatures. This angular variation has been Fitted with the classical uniaxial anisotropy crystal model and yields the values of 2K₁/M-4πM=-4∼-7 KOe, 4K₂ =-0.8∼0.8 KOe and g-factor = 2.3~2.8. The FMR measurments of the first anisotropy constant are quite different from the counterparts measured with VSM. This discrepancy is interpreted as a result of the formation of two ferromagnetic phases. With this simple model, the substrate temperature dependence of First anisotropy is explained and it is predicted that a lower substrate temperature will improve the Co-Cr Films for their potential application in perpendicular magnetic recording devices. The angular dependence of the FMR linewidth is discussed. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

No description available.

The reflectivity, transmissivity, and absorptivity of freshly evaporated silver and copper films were measured in vacuo and then in the presence of several gases. These measurements were performed, using the photoelectric method, with two photomultiplier tubes (931-A and 1P21), and were made at an angle of incidence of zero degrees for two different wavelengths (4047 A and 4358 A). The gases used were air, argon, nitrogen and oxygen. The use of oxygen required several changes in the evaporating system in order that the diffusion pump oil would not oxidize too rapidly and cause an explosion. Air was found to increase the transmissivity in two steps, first an initial change, and second a gradual change. The reflectivity decreased in two similar changes. Nitrogen and oxygen revealed to a greater or lesser extent the same changes as were observed for air. Argon produced only a gradual change in both reflectivity and transmissivity. The initial change in oxygen was attributed to oxidation, and the initial change in nitrogen attributed to chemisorption. The gradual change in all gases was due to physical adsorption. The possibility that chemisorption might have caused the initial change in oxygen was pointed out, but this experiment did not allow a definite choice to be made. / Master of Science

Copper and silver films of various thicknesses were deposited at a rapid rate, from four to twenty-five seconds, on glass substrates in ultra high vacua at pressures of 10⁻⁸ torr or lower. Their optical properties, reflectivity, transmissivity and absorptivity, were determined in vacua and in air by direct measurement using photomultiplier tubes. All the measurements were made at nearly normal incidence with a monochromatic light beam of wavelength 4358 A. It was found that the reflectivity of films of both copper and silver decreased as they were exposed to air. The change took place in equal steps. Under the same circumstances, transmissivity increased but in a less regular way. Absorption changed in a most irregular fashion; no pattern could be established. From this study of optical properties, the layer formation on fresh, clean surfaces of copper and silver caused by the air molecules was quite evident. In the case of copper, there may be one or two layers depending on the thickness of the film. They are formed primarily by cuprous oxide. In the case of silver the layer was attributed to chemisorption. Even though there was some indication that more than one layer was formed, the evidence was not conclusive. / Master of Science

by Leung, Kwok Kong. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1999. / Includes bibliographical references (leaves 67). / Text in English; abstracts in English and Chinese. / by Leung, Kwok Kong. / Abstract --- p.ii / Acknowledgement --- p.iii / Contents --- p.iv / List of Figures --- p.vi / Chapter Chapter 1. --- Introduction --- p.1 / Chapter Chapter 2. --- Transmittance in Metal-Dielectric Multilayers --- p.4 / Chapter 2.1 --- Introduction --- p.4 / Chapter 2.2 --- Transfer matrix approach --- p.5 / Chapter 2.3 --- Transfer matrix simulation --- p.7 / Chapter 2.4 --- Physical explanation --- p.14 / Chapter Chapter 3. --- Optical Nonlinear Response of Composite Layer --- p.17 / Chapter 3.1 --- Transfer matrix formalism for oblique incidence --- p.18 / Chapter 3.1.1 --- Transfer matrix method in nonlinear region --- p.18 / Chapter 3.1.2 --- S-polarization --- p.19 / Chapter 3.1.3 --- P-polarization --- p.19 / Chapter 3.1.4 --- Backward propagation technique --- p.22 / Chapter 3.2 --- Nonlinear phase shift --- p.22 / Chapter 3.3 --- Transfer matrix method approach --- p.24 / Chapter 3.4 --- Analytic solution formalism --- p.26 / Chapter Chapter 4. --- Study of Photonic Band Gap of Nonlinear Dielectrics --- p.33 / Chapter 4.1 --- Introduction --- p.33 / Chapter 4.2 --- Nonlinear response of single thin nonlinear layer --- p.34 / Chapter 4.3 --- Nonlinear response of δ-function between two linear dielectric --- p.37 / Chapter 4.4 --- Photonic band structure --- p.41 / Chapter 4.4.1 --- Photonic band structure of linear thin films --- p.41 / Chapter 4.4.2 --- Photonic band structure of linear layers --- p.42 / Chapter 4.5 --- Photonic band gap of nonlinear dielectric multilayers --- p.46 / Chapter Chapter 5. --- Optical Limiting of Composite Material --- p.49 / Chapter 5.1 --- Transmittance of periodic multilayer structures --- p.50 / Chapter 5.1.1 --- Transmittance properties at low intensity --- p.50 / Chapter 5.1.2 --- Transmittance at high intensity: optical limiting effect --- p.52 / Chapter 5.2 --- The effect of layer thickness on optical limiting --- p.53 / Chapter 5.3 --- Optical limiting property of PBG materials --- p.55 / Chapter Chapter 6. --- Conclusion --- p.63 / Chapter Appendix A. --- Effective dielectric function --- p.64 / Bibliography --- p.67

Part I focuses on studying the extent of cooperation in networked entities, within the context of the Prisoner's Dilemma (PD) and the Snowdrift Game (SG). The iterated prisoner's dilemma (IPD) is studied in the full payoff space spanned by two parameters beta and gamma. A theoretical study on two-strategy IPD is presented. We then numerically study the IPD in the full payoff space, with four different initial configurations. It is found that including the Tit-for-tat-like (ETFT) and Always-defecting-like (EAllD) strategies as initial strategies can maximize the dominating area of generous strategies in the payoff space at equilibrium. The roles played by ETFT and EAllD are further studied on the diagonal and anti-diagonal lines of the payoff space. / Part II focuses mainly on studying the optical properties of grating within the Rigorous Coupled-Wave Analysis (RCWA) method. The surface plasmon (SP) dispersion relation in a system consisting of a thin metallic film sandwiched between a linear dielectric and nonlinear dielectric of arbitrary non- linearity is derived, based on a generalized "first integral" approach. The SP dispersion relation in a system consisting of a thin metallic film sandwiched in a symmetric nonlinear dielectric environment is then derived. The changes in SP dispersion relations on film thicknesses are discussed for both cases. / The optical properties of two samples of one-dimensional metallic reflection gratings are studied. The numerical results of the zeroth order reflectance are in good agreement with experimental data. The Wood's anomaly occurs when a particular diffraction order emerges or disappears, thus inducing a change in the efficiency of other diffraction orders. This phenomenon is studied by calculating and measuring the efficiencies of all allowed diffraction orders. Numerical results of the near field patterns show a coupling between the waveguide and SP modes. We also study the controllable enhanced trans- mission in a semiconductor grating. The dielectric constant of a semiconductor becomes a tensor in the presence of a static magnetic field parallel to the slit. Numerical results based on RCWA reveal that the zeroth order transmission peaks at normal incidence can be shifted to longer wavelengths and the peak values of transmission can largely be enhanced when a moderate magnetic field is applied. A single-mode theory incorporating anisotropy is developed. The analytic results are in quantitative agreement with RCWA, indicating that the tunability in the transmission stems from the waveguide mode. / The Snowdrift Game is regarded as an important alternative to PD in studying the emergence of cooperation in competing populations. The phase transitions in spatial snowdrift games are introduced. By studying the relative alignments of the payoffs of C and D nodes, the phase transitions are analytically explained. As an extension to the standard two-person SG, an N-person Snowdrift Game (NPSG) is proposed to include generic multi-person interactions. NPSG in a well-mixed population is studied analytically by using the replicator dynamics. A simulation algorithm is developed. We also study NPSG on lattices and find a suppressed cooperation frequency, when compared with the well-mixed case. For NPSG played on 1D chain, the problem can be solved analytically. We further extend our work to study co-evolving dynamics. We propose and study a model in which the connections are driven to evolve by the dynamics of SG. Compared with played on static network, the cooperation frequency is promoted. A semi-analytic theory is proposed, with the results qualitatively agree with simulation results. / The thesis consists of two independent parts. Part I focuses on evolutionary games in networked entities and Part II focuses on calculations on optical properties of metallic gratings. / Yin, Haiping = 競爭群體中合作的產生及具規則結構之金屬薄膜的光學性質 / 尹海平. / Adviser: Hui Pak Ming. / Source: Dissertation Abstracts International, Volume: 72-04, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2010. / Includes bibliographical references (leaves 185-200). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. Ann Arbor, MI : ProQuest Information and Learning Company, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese. / Yin, Haiping = Jing zheng qun ti zhong he zuo de chan sheng ji ju gui ze jie gou zhi jin shu bo mo de guang xue xing zhi / Yin Haiping.