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Linear and nonlinear intensity dependent refractive index of Hg/sub 1-x/Cd/sub x/Te

Journal Article · · J. Appl. Phys.; (United States)
DOI:https://doi.org/10.1063/1.331770· OSTI ID:5557600
;
The index of refraction n is calculated as a function of frequency and mole fraction x for the ternary compound Hg/sub 1-x/Cd/sub x/Te in terms of known experimental parameters and compared with recent experimental results. The theoretical result for n is obtained from a quantum mechanical calculation of the dielectric constant of a compound semiconductor, which has been successfully applied to a number of III--V and II--VI binary, ternary, and quaternary compounds for which experimental data are available. The refractive index is calculated in terms of basic material parameters only, with no adjustable constants. These material parameters consist of band-gap energy, effective electron mass, and effective heavy hole mass at the band edge, the lattice constant, the spin-orbit splitting energy, and the carrier concentration for n-type of p-type materials. If these parameters are known as functions of mole fraction x and temperature, the refractive index is completely determined as a function of frequency below the fundamental absorption edge. The change in refractive index with increasing temperature depends mainly on the change in band-gap energy with temperature and is expected to be positive for x>0.529 and negative for x<0.529 for Hg/sub 1-x/Cd/sub x/Te . A negative change in the refractive index at the absorption edge proportional to I/sup 1//sup ///sup 3/, where I is the incident radiation intensity, is predicted on passing radiation through a crystal if the change in carrier concentration of the initially unoccupied conduction band is assumed proportional to I.
Research Organization:
Department of Physics, Boston University, Boston, Massachusetts 02215
DOE Contract Number:
AC02-79ER10444
OSTI ID:
5557600
Journal Information:
J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 54:10; ISSN JAPIA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOY SYSTEMS
CADMIUM COMPOUNDS
CADMIUM TELLURIDES
CHALCOGENIDES
COUPLING
DATA
DIELECTRIC PROPERTIES
EFFECTIVE MASS
ELECTRICAL PROPERTIES
ELECTRONS
ELEMENTARY PARTICLES
ENERGY GAP
FERMIONS
FREQUENCY DEPENDENCE
HOLES
INFORMATION
INTERMEDIATE COUPLING
L-S COUPLING
LEPTONS
MASS
MATERIALS
MATHEMATICAL MODELS
MECHANICS
MERCURY COMPOUNDS
MERCURY TELLURIDES
N-TYPE CONDUCTORS
NUMERICAL DATA
OPTICAL PROPERTIES
P-TYPE CONDUCTORS
PARAMETRIC ANALYSIS
PHYSICAL PROPERTIES
QUANTITY RATIO
QUANTUM MECHANICS
REFRACTIVITY
SEMICONDUCTOR MATERIALS
TELLURIDES
TELLURIUM COMPOUNDS
TERNARY ALLOY SYSTEMS
THEORETICAL DATA