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Optical properties of carbon are studied in bulk state from λ ∿ 0.05 to 100 μm for graphite, and from λ ∿ 0.05 to 1000 μm for glassy carbon; in small particle state, the optical studies cover the spectral range going from λ ∿ 0.1 to 100 μm for all the materials. A Kramers-Kronig analysis of near normal reflectance data and/or a reflectance data fit to a Drude-Lorentz model gave bulk optical constants. These optical constants are used in theoretical calculations of extinction and the results compared with experimental results obtained from measurements of a variety of carbon particles. It is inferred that the high experimentally observed extinction is mainly due to a shape effect.

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D.Ing. (Electrical and Electronic Engineering) / A theory was developed for the investigation of the optical properties of inhomogeneous layered media. Reflectivity and transmissivity analysis of multi-layered structures was realized by utilizing flow graph representations and by employing Mason's rule. This study served as a base for the development of analytical expressions in integral form for reflectivity, transmissivity, reflectance, bilinear transformed reflectance and transmittance of materials possessing inhomogeneous refractive index profiles. These proposed formulas were derived for both normal and oblique incidence and contemplate nonabsorbing, as well as, absorbing materials. An ellipsometric expression for inhomogeneous layers was also derived by employing the developed theory. Several hypothetical examples that emulate refractive index profiles in ionimplanted semiconductors were investigated, including a buried layer with a gaussian refractive index profile, and two homogeneous layers with a half-gaussian transition region between them. Curves of reflectance versus wave number were simulated using the derived formulations in two different ways: (i) employing numerical methods (ii) applying analytical solutions. The performance of these simulations was compared to standard techniques such as the matrix method and the Wentzel-Kramers-Brillouin (WKB) approximation. Very good agreement between the proposed theory and the matrix technique was found. The developed formulations were appropriate even at wave numbers where the WKB approximation was not valid. It must be stressed that the analysis of the reflectance at these wave numbers is important in the study of processed semiconductors. In comparison to the matrix technique, the integral formulation led to substantial time saving, which, depending on the particular application, was between one and two orders of magnitude faster. This fact indicated that the developed expressions for reflectance and transmittance can be used to great advantage in least-square curve-fit ...

M.Sc. (Physics) / Please refer to full text to view abstract

by Ching Shuk Chi, Emily. / Parallel title in Chinese characters. / Thesis (M.Ph.)--Chinese University of Hong Kong, 1988. / Bibliography: leaves 90-92.

Fong King Yan = 光栅衍射及含週期結構的金屬片的透射增強效應的理論研究 / 方敬恩. / Thesis submitted in: September 2006. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (leaves 111-119). / Abstracts in English and Chinese. / Fong King Yan = Guang zha yan she ji han zhou qi jie gou de jin shu pian de tou she zeng qiang xiao ying de li lun yan jiu / Fang Jing'en. / Chapter 1 --- Introduction --- p.1 / Chapter 2 --- Review on Grating Theories --- p.6 / Chapter 2.1 --- Basic Concepts --- p.6 / Chapter 2.1.1 --- Maxwell's Equations --- p.6 / Chapter 2.1.2 --- Translational Symmetry --- p.8 / Chapter 2.1.3 --- TM and TE Polarizations --- p.10 / Chapter 2.1.4 --- The Grating Equation --- p.11 / Chapter 2.2 --- Rayleigh's Method --- p.12 / Chapter 2.3 --- Integral Method --- p.13 / Chapter 2.4 --- Classical Modal Method --- p.15 / Chapter 2.5 --- Rigorous Coupled-Wave Analysis --- p.16 / Chapter 2.5.1 --- General Form of Electromagnetic Modes --- p.17 / Chapter 2.5.2 --- Fourier Factorization Rules --- p.20 / Chapter 2.5.3 --- Matching Boundary Conditions --- p.21 / Chapter 2.5.4 --- Multilayered Gratings and Staircase Approximation --- p.25 / Chapter 2.5.5 --- Model Calculations --- p.25 / Chapter 2.6 --- Anisotropic Gratings --- p.26 / Chapter 2.6.1 --- General Form of Electromagnetic Modes --- p.29 / Chapter 2.6.2 --- Matching Boundary Conditions --- p.30 / Chapter 2.6.3 --- Model Calculations --- p.31 / Chapter 3 --- Grating Diffraction by Linear Superposition of Retarded Field --- p.33 / Chapter 3.1 --- Basic Ideas --- p.33 / Chapter 3.2 --- Formalism --- p.35 / Chapter 3.2.1 --- Field Induced Currents --- p.36 / Chapter 3.2.2 --- Field due to Current and Charge Densities --- p.38 / Chapter 3.2.3 --- "Internal, Transmitted, and Reflected Fields" --- p.39 / Chapter 3.2.4 --- Points of Physical Interest --- p.41 / Chapter 3.3 --- Model Calculations --- p.43 / Chapter 3.4 --- Application to Systems with Anisotropy or Nonlinearity --- p.46 / Chapter 3.5 --- Summary --- p.52 / Chapter 4 --- Introduction to Surface Plasmonic Excitations and Phenomenon of Enhanced Transmission --- p.55 / Chapter 4.1 --- Introduction to Surface Plasmons --- p.55 / Chapter 4.2 --- Phenomenon of Enhanced Transmission --- p.60 / Chapter 5 --- Enhanced Transmission Through Stacking Grating with Subwavelength Slits --- p.72 / Chapter 6 --- Controlling Enhanced Transmissions via Anisotropic Effects --- p.81 / Chapter 6.1 --- Effects of Anisotropic Waveguide on The Phenomenon of Enhanced Transmission --- p.82 / Chapter 6.1.1 --- Control of Enhanced Transmission by Anisotropic Waveguide --- p.83 / Chapter 6.1.2 --- Electromagnetic Modes in Anisotropic Waveguide --- p.87 / Chapter 6.1.3 --- Single Mode Model for Studying Transmission of Grating with Slits Filled with Anisotropic Material --- p.89 / Chapter 6.2 --- Effects of Strong Applied Magnetic Field on the Phenomenon of Enhanced Transmission --- p.95 / Chapter 6.2.1 --- Magnetic Field Induced Anisotropy in Metals --- p.95 / Chapter 6.2.2 --- Enhanced Transmission under Influence of Strong Magnetic Field --- p.97 / Chapter 6.2.3 --- Modification of Surface Plasmon Dispersion relation by Strong Applied Magnetic Field --- p.101 / Chapter 7 --- Conclusion --- p.107 / Bibliography --- p.111 / Chapter A --- Fourier Factorization Rules --- p.120 / Chapter A.l --- Notations --- p.120 / Chapter A.2 --- Factorization rules [28] --- p.121 / Chapter A.3 --- Fourier Factorization of Quantities in Anisotropic medium [32] --- p.122 / Chapter B --- Derivation of Integral in Eq. (3.10) --- p.124