Three-dimensional metallic micro/nanostructures fabricated by two-photon-induced reduction of metal ions

Takuo Tanaka, Atsushi Ishikawa, Satoshi Kawata

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We report on a technique that enables to fabricate three-dimensional (3D) metallic microstructures by means of two-photon-induced metal-ion reduction. A femtosecond near-infrared laser is focused by a high-NA objective lens into a metal-ion aqueous solution. Due to the nonlinear nature of the two-photon absorption (TPA) process, metal-ions are directly reduced only at the focused spot. By scanning the laser beam spot in three dimensions, we can directly obtain arbitrary 3D metallic structures. To fabricate silver and gold structures, we use a 0.2-M aqueous solution of silver nitrate (AgNO3) and a 0.24-M aqueous solution of tetra chloroauric acid (HAuCl4), respectively. We demonstrate the fabrication of a continuous and electrically conductive silver wire whose minimum width is 400 nm. Electrical measurement shows that the resistivity of the fabricated silver wire is 5.30 × 10 -8 Ωm, which is only 3.3 times larger than that of bulk silver (1.62 × 10-8 Ωm). We also discuss the resolution of our technique in terms of ions diffusion based on the Pick's first law and the mobility of metal-ions in aqueous solution. Moreover, the realization of a self-standing 3D silver microstructures on the substrates are demonstrated. This method will become a promising technique for fabricating 3D plasmonic micro/nano structures with arbitrary shape.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6324
DOIs
Publication statusPublished - 2006
Externally publishedYes
EventPlasmonics: Nanoimaging, Nanofabrication, and their Applications II - San Diego, CA, United States
Duration: Aug 16 2006Aug 17 2006

Other

OtherPlasmonics: Nanoimaging, Nanofabrication, and their Applications II
CountryUnited States
CitySan Diego, CA
Period8/16/068/17/06

Fingerprint

Metal ions
Nanostructures
metal ions
Silver
Photons
silver
aqueous solutions
photons
wire
silver nitrates
microstructure
Wire
Microstructure
Infrared lasers
infrared lasers
electrical measurement
Laser beams
lenses
laser beams
Nitrates

Keywords

  • Conductivity
  • Diffusion theory
  • Micro structure
  • Plasmonic metamaterial
  • Reduction
  • Three-dimensional metallic structure
  • Two-photon absorption

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Tanaka, T., Ishikawa, A., & Kawata, S. (2006). Three-dimensional metallic micro/nanostructures fabricated by two-photon-induced reduction of metal ions. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6324). [63240R] https://doi.org/10.1117/12.681508

Three-dimensional metallic micro/nanostructures fabricated by two-photon-induced reduction of metal ions. / Tanaka, Takuo; Ishikawa, Atsushi; Kawata, Satoshi.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6324 2006. 63240R.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Tanaka, T, Ishikawa, A & Kawata, S 2006, Three-dimensional metallic micro/nanostructures fabricated by two-photon-induced reduction of metal ions. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 6324, 63240R, Plasmonics: Nanoimaging, Nanofabrication, and their Applications II, San Diego, CA, United States, 8/16/06. https://doi.org/10.1117/12.681508
Tanaka T, Ishikawa A, Kawata S. Three-dimensional metallic micro/nanostructures fabricated by two-photon-induced reduction of metal ions. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6324. 2006. 63240R https://doi.org/10.1117/12.681508
Tanaka, Takuo ; Ishikawa, Atsushi ; Kawata, Satoshi. / Three-dimensional metallic micro/nanostructures fabricated by two-photon-induced reduction of metal ions. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6324 2006.
@inproceedings{4789fee5a52741f29d02a19ddd6e2b6e,
title = "Three-dimensional metallic micro/nanostructures fabricated by two-photon-induced reduction of metal ions",
abstract = "We report on a technique that enables to fabricate three-dimensional (3D) metallic microstructures by means of two-photon-induced metal-ion reduction. A femtosecond near-infrared laser is focused by a high-NA objective lens into a metal-ion aqueous solution. Due to the nonlinear nature of the two-photon absorption (TPA) process, metal-ions are directly reduced only at the focused spot. By scanning the laser beam spot in three dimensions, we can directly obtain arbitrary 3D metallic structures. To fabricate silver and gold structures, we use a 0.2-M aqueous solution of silver nitrate (AgNO3) and a 0.24-M aqueous solution of tetra chloroauric acid (HAuCl4), respectively. We demonstrate the fabrication of a continuous and electrically conductive silver wire whose minimum width is 400 nm. Electrical measurement shows that the resistivity of the fabricated silver wire is 5.30 × 10 -8 Ωm, which is only 3.3 times larger than that of bulk silver (1.62 × 10-8 Ωm). We also discuss the resolution of our technique in terms of ions diffusion based on the Pick's first law and the mobility of metal-ions in aqueous solution. Moreover, the realization of a self-standing 3D silver microstructures on the substrates are demonstrated. This method will become a promising technique for fabricating 3D plasmonic micro/nano structures with arbitrary shape.",
keywords = "Conductivity, Diffusion theory, Micro structure, Plasmonic metamaterial, Reduction, Three-dimensional metallic structure, Two-photon absorption",
author = "Takuo Tanaka and Atsushi Ishikawa and Satoshi Kawata",
year = "2006",
doi = "10.1117/12.681508",
language = "English",
isbn = "0819464031",
volume = "6324",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",

}

TY - GEN

T1 - Three-dimensional metallic micro/nanostructures fabricated by two-photon-induced reduction of metal ions

AU - Tanaka, Takuo

AU - Ishikawa, Atsushi

AU - Kawata, Satoshi

PY - 2006

Y1 - 2006

N2 - We report on a technique that enables to fabricate three-dimensional (3D) metallic microstructures by means of two-photon-induced metal-ion reduction. A femtosecond near-infrared laser is focused by a high-NA objective lens into a metal-ion aqueous solution. Due to the nonlinear nature of the two-photon absorption (TPA) process, metal-ions are directly reduced only at the focused spot. By scanning the laser beam spot in three dimensions, we can directly obtain arbitrary 3D metallic structures. To fabricate silver and gold structures, we use a 0.2-M aqueous solution of silver nitrate (AgNO3) and a 0.24-M aqueous solution of tetra chloroauric acid (HAuCl4), respectively. We demonstrate the fabrication of a continuous and electrically conductive silver wire whose minimum width is 400 nm. Electrical measurement shows that the resistivity of the fabricated silver wire is 5.30 × 10 -8 Ωm, which is only 3.3 times larger than that of bulk silver (1.62 × 10-8 Ωm). We also discuss the resolution of our technique in terms of ions diffusion based on the Pick's first law and the mobility of metal-ions in aqueous solution. Moreover, the realization of a self-standing 3D silver microstructures on the substrates are demonstrated. This method will become a promising technique for fabricating 3D plasmonic micro/nano structures with arbitrary shape.

AB - We report on a technique that enables to fabricate three-dimensional (3D) metallic microstructures by means of two-photon-induced metal-ion reduction. A femtosecond near-infrared laser is focused by a high-NA objective lens into a metal-ion aqueous solution. Due to the nonlinear nature of the two-photon absorption (TPA) process, metal-ions are directly reduced only at the focused spot. By scanning the laser beam spot in three dimensions, we can directly obtain arbitrary 3D metallic structures. To fabricate silver and gold structures, we use a 0.2-M aqueous solution of silver nitrate (AgNO3) and a 0.24-M aqueous solution of tetra chloroauric acid (HAuCl4), respectively. We demonstrate the fabrication of a continuous and electrically conductive silver wire whose minimum width is 400 nm. Electrical measurement shows that the resistivity of the fabricated silver wire is 5.30 × 10 -8 Ωm, which is only 3.3 times larger than that of bulk silver (1.62 × 10-8 Ωm). We also discuss the resolution of our technique in terms of ions diffusion based on the Pick's first law and the mobility of metal-ions in aqueous solution. Moreover, the realization of a self-standing 3D silver microstructures on the substrates are demonstrated. This method will become a promising technique for fabricating 3D plasmonic micro/nano structures with arbitrary shape.

KW - Conductivity

KW - Diffusion theory

KW - Micro structure

KW - Plasmonic metamaterial

KW - Reduction

KW - Three-dimensional metallic structure

KW - Two-photon absorption

UR - http://www.scopus.com/inward/record.url?scp=33751023551&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33751023551&partnerID=8YFLogxK

U2 - 10.1117/12.681508

DO - 10.1117/12.681508

M3 - Conference contribution

AN - SCOPUS:33751023551

SN - 0819464031

SN - 9780819464033

VL - 6324

BT - Proceedings of SPIE - The International Society for Optical Engineering

ER -