Patent ID: 7459106

Claim:
A compound or composition, comprising: at least one chromophore having a simultaneous two-photon or multi-photon absorptivity; and at least one photoacid or radical generator in close proximity to said chromophore; wherein said chomophore has a two-photon absorption cross-section of >50×10 −50 cm 4 s/photon. (1) wherein the generator is a sulfonium group has of formula —(CH 2 ) γ —(C 6 H 4 ) δ —SR ar R a6 , wherein R a5 and R a6 are each independently alkyl, aryl, or monomer groups, and wherein γ=0 to 25, and δ=0 to 5; (2) wherein the generator is a selenonium group of the formula —(CH 2 ) γ —(C 6 H 4 ) δ —SeR a5 R a6 , wherein R a5 and R a6 are each independently alkyl, aryl, or monomer groups, and wherein γ=0 to 25, and δ=0 to 5; or (3) wherein the generator is an iodonium group of the formula —(CH 2 ) γ —(C 6 H 4 ) δ —IR a7 , wherein R a7 is alkyl, aryl, or monomer group, and wherein γ=0 to 25, and δ=0 to 5.