Terahertz Wave Emission from Spontaneously Formed Complex Nanostructures on Silver Ink

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  • 金属インク上に自発的に形成される 複雑なナノ構造からのテラヘルツ波放射
  • キンゾク インク ジョウ ニ ジハツテキ ニ ケイセイ サレル フクザツ ナ ナノ コウゾウ カラ ノ テラヘルツハ ホウシャ

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In this review, we introduce our recent study on terahertz pulse generation from silver nanoparticle ink. On the ink's surface, complex nanostructures are spontaneously formed by a baking process. Such metallic nanostructures, which enhance electric fields by plasmon resonance, increase the emission of terahertz waves. The structures formed on the ink surface depend on the baking temperatures, and the generation efficiency of the terahertz waves was large for samples baked around the transition temperatures of the ink from the insulator to the metal. We discuss the relation among the baking temperature, the nanostructures, and the emitted terahertz waves, based on the percolation process of the nanoparticles dispersed in the ink. We also describe the fabrication of terahertz sources that effectively emit a specific frequency by combining spontaneously formed nanostructures with microstructures made using inkjet printers or laser ablation processes.

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