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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/Material/RefractiveMaterialImpl.h
//! @brief Defines class RefractiveMaterialImpl.
//!
//! @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_SAMPLE_MATERIAL_REFRACTIVEMATERIALIMPL_H
#define BORNAGAIN_SAMPLE_MATERIAL_REFRACTIVEMATERIALIMPL_H
#include "Sample/Material/IMaterialImpl.h"
#include "Sample/Material/Material.h"
//! Material implementation based on refractive coefficiencts (valid for one wavelength value only)
class RefractiveMaterialImpl : public IMaterialImpl {
public:
friend Material RefractiveMaterial(const std::string&, double, double, const R3&);
~RefractiveMaterialImpl() override = default;
#ifndef SWIG
//! Returns pointer to a copy of material
RefractiveMaterialImpl* clone() const override;
#endif // SWIG
//! Returns refractive index
//! For this particular implementation returned value does not depend
//! on passed wavelength
complex_t refractiveIndex(double wavelength) const override;
//! Returns squared refractive index.
//! For this particular implementation returned value does not depend
//! on passed wavelength.
complex_t refractiveIndex2(double wavelength) const override;
//! Returns underlying refractive index value
complex_t refractiveIndex_or_SLD() const override;
//! Returns type of material implementation
MATERIAL_TYPES typeID() const override { return MATERIAL_TYPES::RefractiveMaterial; }
//! Returns (\f$ \pi/\lambda^2 \f$ - sld), sld (in \f$nm^{-2}\f$) being the scattering length
//! density. If the wavelength associated with passed wavevector is different from the one
//! associated with refractive coefficients used during the object construction,
//! provided result is inconsistent.
complex_t scalarSubtrSLD(double lambda0) const override;
//! Prints object data
std::string print() const override;
private:
RefractiveMaterialImpl(const std::string& name, double delta, double beta,
const R3& magnetization);
const double
m_delta; //!< \f$\delta\f$ coefficient for refractive index \f$n = 1 - \delta + i \beta\f$
const double
m_beta; //!< \f$\beta\f$ coefficient for refractive index \f$n = 1 - \delta + i \beta\f$
};
#endif // BORNAGAIN_SAMPLE_MATERIAL_REFRACTIVEMATERIALIMPL_H
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