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Question how to reflect most of the optical photon? 

Forum: Processes Involving Optical Photons
Date: 18 Oct, 2016
From: <lili>

Dear all,

I now do optical simulation for PET application. I suppose most of the optical photon reflect on the optical surface, so I defined the surface as below:

G4double scintYR_sigma_alpha = 0.1 ;

G4OpticalSurface* scintYR = new G4OpticalSurface("scintYR"); G4LogicalBorderSurface* scintYR_border = new G4LogicalBorderSurface("scintYR", fPhysCryst,physSideXL,scintYR);

G4LogicalBorderSurface* scintYR_border2 =new G4LogicalBorderSurface("scintYR",physSideXL,fPhysCryst,scintYR);

scintYR->SetType(dielectric_metal);

scintYR->SetFinish(ground);

scintYR->SetModel(unified);

scintYR->SetSigmaAlpha(scintYR_sigma_alpha);

const G4int scintYR_NUM = 2;

G4double scintYR_pp[scintYR_NUM] = {1.84*eV, 4.08*eV};

G4double scintYR_specularlobe[scintYR_NUM] = {1., 1.};

G4double scintYR_specularspike[scintYR_NUM] = {0., 0.};

G4double scintYR_backscatter[scintYR_NUM] = {0., 0.};

G4double scintYR_rindex[scintYR_NUM] = {1.0, 1.0};

G4double scintYR_reflectivity[scintYR_NUM] = {0.985, 0.985};

G4double scintYR_efficiency[scintYR_NUM] = {0.0, 0.0};

G4MaterialPropertiesTable* scintYR_Property = new G4MaterialPropertiesTable();

scintYR_Property->AddProperty("RINDEX",scintYR_pp,scintYR_rindex,scintYR_NUM);

scintYR_Property->AddProperty("SPECULARLOBECONSTANT",scintYR_pp,scintYR_specularlobe,scintYR_NUM);

scintYR_Property->AddProperty("SPECULARSPIKECONSTANT",scintYR_pp,scintYR_specularspike,scintYR_NUM);

scintYR_Property->AddProperty("BACKSCATTERCONSTANT",scintYR_pp,scintYR_backscatter,scintYR_NUM);

scintYR_Property->AddProperty("REFLECTIVITY",scintYR_pp,scintYR_reflectivity,scintYR_NUM);

scintYR_Property->AddProperty("EFFICIENCY",scintYR_pp,scintYR_efficiency,scintYR_NUM);

scintYR->SetMaterialPropertiesTable(scintYR_Property);

Unfortunately, most of the optical photon refract from the surface, not reflect back. Could anyone know the reason? Thanks for any reply.

Best Lili

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1 Feedback: Re: how to reflect most of the optical photon?   (Gumplinger Peter - 19 Oct, 2016)
(_ Question: Re: how to reflect most of the optical photon?   (lili - 19 Oct, 2016)
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