class dielectric_constant
The class that handles the storage of dielectric constants,
1+i2, and their conversions to optical
constants (n and k). Functions that require
this information can be prototyped with either optical_constant or
dielectric_constant arguments, and the compiler will
perform the conversion when necessary. Use of the classes
optical_constant and
dielectric_constant avoids one accidentally confusing
the two when passing values to functions, as can happen if
they are left as complex numbers. To store information about
the wavelength dependence of the optical constants, use the
class dielectric_function.
Include file:
#include "optconst.h"
Source code:
optconst.h
See also:
SCATMECH Home,
Conventions, optical_constant, dielectric_function
M. Born and E. Wolf, Principles of Optics,
(Pergamon, Oxford, 1980).
Definition of public elements:
class dielectric_constant {
double e1;
double e2;
dielectric_constant();
dielectric_constant( complex<double> x);
dielectric_constant( double x, double y=0.);
dielectric_constant( const optical_constant& n);
operator complex<double>() const;
friend istream& operator>>(istream& is,dielectric_constant& e);
friend ostream& operator<<(ostream& os,const dielectric_constant& ee);
};
double e1
double e2
The real and imaginary part of the dielectric constant.
dielectric_constant()
Default constructor that initializes the dielectric constant to that appropriate for vacuum.
dielectric_constant( complex<double> x)
Constructor that initializes the dielectric constant to the value x.
Example:
complex<double> eps; dielectric_constant dc(eps);
dielectric_constant( double x, double y=0.0)
Constructor that initializes the dielectric constant to complex<double>(x,y).
Example:
dielectric_constant eps(2.25);
dielectric_constant( const optical_constant& n)
Constructor that performs conversion from an optical_constant to dielectric_constant.
Example:
optical_constant n(1.5); dielectric_constant e(n);
operator complex<double>() const
Conversion from dielectric_constant to a complex<double>. This conversion should be made whenever actual calculations are made with the dielectric_constant.
Example:
dielectric_constant e; double theta; complex<double> q=sqrt(sqr((complex<double>)e)-sqr(sin(theta)));
friend istream& operator>>(istream& is,dielectric_constant& e)
Input of a dielectric_constant from an istream.
Example:
dielectric constant e; cout << "Enter dielectric constant:"; cin >> e;
friend ostream& operator<<(ostream& os,const dielectric_constant& ee)
Output of a dielectric_constant to an ostream.
Example:
dielectric_constant e; cout << "Dielectric constant = " << e << endl;
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Current SCATMECH version: 7.22 (April 2021)