Patent ID: 7041514

Claim:
A method for repairing a non-functioning integrated circuit comprising: providing an integrated circuit chip, said integrated circuit chip comprising an integrated circuit chip active surface, said integrated circuit chip active surface being formed on a first surface of a substrate, said substrate having a substrate backside surface, said substrate backside surface being opposite said substrate first surface, said substrate having a substrate band-gap energy; providing redundant repair circuitry in said integrated circuit chip active surface to replace any failed circuitry in said integrated circuit chip active surface; forming a fuse in said integrated circuit chip active surface, said fuse for connecting said redundant repair circuitry to circuitry formed in said integrated circuit active surface, said fuse being activated by LASER energy, said LASER energy being comprised of photons, each photon having a predetermined photon energy, said photon energy being less than said substrate band-gap energy; activating said fuse in said integrated circuit chip active surface by directing said LASER at said substrate backside surface and focusing said LASER energy such that an intensity of said LASER energy at said fuse causes multiple-photon absorption by said fuse, said fuse thereby connecting said redundant repair circuitry to said circuitry formed in said integrated circuit active surface.