SpecularScalarStrategy.h

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// ************************************************************************** //
//
//  BornAgain: simulate and fit scattering at grazing incidence
//
//! @file      Sample/Specular/SpecularScalarStrategy.h
//! @brief     Defines class SpecularScalarStrategy.
//!
//! @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_MULTILAYER_SPECULARSCALARSTRATEGY_H
#define BORNAGAIN_CORE_MULTILAYER_SPECULARSCALARSTRATEGY_H
 
#include "Sample/RT/ScalarRTCoefficients.h"
#include "Sample/Specular/ISpecularStrategy.h"
#include <memory>
#include <vector>
 
class Slice;
 
//! Implements the scalar Fresnel computation
//!
//! Implements method 'execute' to compute refraction angles and transmission/reflection
//! coefficients for coherent wave propagation in a multilayer.
//!
//! Inherited by SpecularScalarNCStrategy, SpecularScalarTanhStrategy
//!
//! @ingroup algorithms_internal
class SpecularScalarStrategy : public ISpecularStrategy
{
public:
    //! Computes refraction angles and transmission/reflection coefficients
    //! for given coherent wave propagation in a multilayer.
    virtual ISpecularStrategy::coeffs_t Execute(const std::vector<Slice>& slices,
                                                const kvector_t& k) const override;
 
    virtual ISpecularStrategy::coeffs_t Execute(const std::vector<Slice>& slices,
                                                const std::vector<complex_t>& kz) const override;
 
private:
    virtual std::pair<complex_t, complex_t> transition(complex_t kzi, complex_t kzi1,
                                                       double sigma) const = 0;
 
    std::vector<ScalarRTCoefficients> computeTR(const std::vector<Slice>& slices,
                                                const std::vector<complex_t>& kz) const;
 
    static void setZeroBelow(std::vector<ScalarRTCoefficients>& coeff, size_t current_layer);
 
    void calculateUpFromLayer(std::vector<ScalarRTCoefficients>& coeff,
                              const std::vector<Slice>& slices,
                              const std::vector<complex_t>& kz) const;
};
 
#endif // BORNAGAIN_CORE_MULTILAYER_SPECULARSCALARSTRATEGY_H