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The spliced-fiber pressure-filling technique. (a) a gold wire is inserted into a silica capillary; (b) the wire is pushed into the capillary using a tungsten wire and the capillary end cleaved off; (c) capillary with wire is spliced to a silica fiber with hollow channels; (d) the spliced section is heated to the melting point of gold and high pressure argon gas is applied; (e) the filled structure. Reprinted with permission from [56].
