Quantitative measurement of the near-field enhancement of nanostructures by two-photon polymerization

Geldhauser, Tobias; Kolloch, Andreas; Murazawa, Naoki; Ueno, Kosei; Boneberg, Johannes; Leiderer, Paul; Scheer, Elke; Misawa, Hiroaki

Quantitative measurement of the near-field enhancement of nanostructures by two-photon polymerization

Dateien

geldhauser_etal.pdfGröße: 4.8 MBDownloads: 729

Datum

2012

Autor:innen

Geldhauser, Tobias

Kolloch, Andreas

Murazawa, Naoki

Ueno, Kosei

Boneberg, Johannes

Leiderer, Paul

Scheer, Elke

Misawa, Hiroaki

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Langmuir. 2012, 28(24), pp. 9041-9046. ISSN 0743-7463. eISSN 1520-5827. Available under: doi: 10.1021/la300219w

Zusammenfassung

The quantitative determination of the strength of the near-field enhancement in and around nanostructures is essential for optimizing and using these structures for applications. We combine the Gaussian intensity distribution of a laser profile and two-photon-polymerization of SU-8 to a suitable tool for the quantitative experimental measurement of the near-field enhancement of a nanostructure. Our results give a feedback to the results obtained by finite-difference time-domain (FDTD) simulations. The structures under investigation are gold nanotriangles on a glass substrate with 85 nm side length and a thickness of 40 nm. We compare the threshold fluence for polymerization for areas of the Gaussian intensity profile with and without the near-field enhancement of the nanostructures. The experimentally obtained value of the near-field intensity enhancement is 600 ± 140, independent of the laser power, irradiation time, and spot size. The FDTD simulation shows a pointlike maximum of 2600 at the tip. In a more extended area with an approximate size close to the smallest polymerized structure of 25 nm in diameter, we find a value between 800 and 600. Using our novel approach, we determine the threshold fluence for polymerization of the commercially available photopolymerizable resin SU-8 by a femtosecond laser working at a wavelength of 795 nm and a repetition rate of 82 MHz to be 0.25 J/cm2 almost independent of the irradiation time and the laser power used. This finding is important for future applications of the method because it enables one to use varying laser systems.

Fachgebiet (DDC)

530 Physik

Schlagwörter

Colloidal Nanoplasmonics

Zitieren

ISO 690

GELDHAUSER, Tobias, Andreas KOLLOCH, Naoki MURAZAWA, Kosei UENO, Johannes BONEBERG, Paul LEIDERER, Elke SCHEER, Hiroaki MISAWA, 2012. Quantitative measurement of the near-field enhancement of nanostructures by two-photon polymerization. In: Langmuir. 2012, 28(24), pp. 9041-9046. ISSN 0743-7463. eISSN 1520-5827. Available under: doi: 10.1021/la300219w

BibTex

@article{Geldhauser2012-06-19Quant-19448,
  year={2012},
  doi={10.1021/la300219w},
  title={Quantitative measurement of the near-field enhancement of nanostructures by two-photon polymerization},
  number={24},
  volume={28},
  issn={0743-7463},
  journal={Langmuir},
  pages={9041--9046},
  author={Geldhauser, Tobias and Kolloch, Andreas and Murazawa, Naoki and Ueno, Kosei and Boneberg, Johannes and Leiderer, Paul and Scheer, Elke and Misawa, Hiroaki}
}

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