MaterialBySLDImpl.h

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// ************************************************************************** //
//
//  BornAgain: simulate and fit scattering at grazing incidence
//
//! @file      Sample/Material/MaterialBySLDImpl.h
//! @brief     Defines class MaterialBySLDImpl.
//!
//! @homepage  http://www.bornagainproject.org
//! @license   GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors   Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************** //
 
#ifndef BORNAGAIN_CORE_MATERIAL_MATERIALBYSLDIMPL_H
#define BORNAGAIN_CORE_MATERIAL_MATERIALBYSLDIMPL_H
 
#include "Sample/Material/MagneticMaterialImpl.h"
#include "Sample/Material/MaterialFactoryFuncs.h"
 
//! Material implementation based on wavelength-independent data (valid for a range of wavelengths)
//! @ingroup materials
 
class MaterialBySLDImpl : public MagneticMaterialImpl
{
public:
    friend Material MaterialBySLD(const std::string& name, double sld_real, double sld_imag,
                                  kvector_t magnetization);
 
    virtual ~MaterialBySLDImpl() = default;
 
    //! Returns pointer to a copy of material
    MaterialBySLDImpl* clone() const override;
 
    //! Returns refractive index
    complex_t refractiveIndex(double wavelength) const override;
 
    //! Returns squared refractive index
    complex_t refractiveIndex2(double wavelength) const override;
 
    //! Returns underlying material data
    complex_t materialData() const override;
 
    //! Returns type of material implementation
    MATERIAL_TYPES typeID() const override { return MATERIAL_TYPES::MaterialBySLD; }
 
    //! Returns (\f$ \pi/\lambda^2 \f$ - sld), sld (in \f$nm^{-2}\f$) being the scattering length
    //! density
    complex_t scalarSubtrSLD(const WavevectorInfo& wavevectors) const override;
 
    //! Prints object data
    void print(std::ostream& ostr) const override;
 
private:
    //! Constructs a wavelength-independent material with a given complex-valued
    //! scattering length density (SLD). SLD units are \f$ nm^{-2} \f$.
    MaterialBySLDImpl(const std::string& name, double sld_real, double sld_imag,
                      kvector_t magnetization);
    //! Returns the scattering length density
    complex_t sld() const;
 
    double m_sld_real; //!< complex-valued scattering length density
    double m_sld_imag; //!< imaginary part of scattering length density (negative by default)
};
 
#endif // BORNAGAIN_CORE_MATERIAL_MATERIALBYSLDIMPL_H