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Question Photon Trapping Fraction 

Forum: Processes Involving Optical Photons
Date: 02 Mar, 2016
From: matthew <matthew>

I'm trying to model an optical fiber with core_rindex = 1.46 and cladding_rindex = 1.39. This combination should produce an optical trapping fraction of ~ 2.4%.

In order to reproduce this spec, I've added an G4OpticalSurface between the cladding and the surrounding air using the following code:

// Clad-Air boundary
    G4OpticalSurface * OpCladAirSurface = new G4OpticalSurface("CladAirSurface");

    OpCladAirSurface -> SetModel(unified);
    OpCladAirSurface -> SetType(dielectric_dielectric);
    OpCladAirSurface -> SetFinish(ground);

    G4LogicalBorderSurface* CladAirSurface = new G4LogicalBorderSurface("CladAirSurface",clad_phys,world_phys,OpCladAirSurface);

    const G4int NUM = 2;
    G4double pp[NUM] = {2.038*eV, 4.144*eV};
    G4double reflectivity[NUM] = {0.15, 0.15};
    G4double efficiency[NUM] = {0.5, 0.7};

    G4MaterialPropertiesTable *SMPT3 = new G4MaterialPropertiesTable();

    SMPT3 -> AddProperty("REFLECTIVITY",pp,reflectivity,NUM);
    SMPT3 -> AddProperty("EFFICIENCY",pp,efficiency,NUM);
    OpCladAirSurface -> SetMaterialPropertiesTable(SMPT3);

My question is: Why does changing the values of reflectivity and efficiency have almost no effect on the number of photons I detect at the end of the fiber?

thanks for any advice. mat

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1 Feedback: Re: Photon Trapping Fraction   (Gumplinger Peter - 02 Mar, 2016)
(_ None: Re: Photon Trapping Fraction   (matthew - 02 Mar, 2016)
(_ Feedback: Re: Photon Trapping Fraction   (Gumplinger Peter - 02 Mar, 2016)
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