Gold nanoparticle-mediated fluorescence enhancement by two-photon polymerized 3D microstructures

Badri L. Aekbote, Félix Schubert, P. Ormos, L. Kelemen

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Fluorescence enhancement achieved by functionalized microstructures made by two-photon polymerization (TPP) is reported for the first time. Microstructures of various shapes made of SU-8 photoresist were prepared and coated with gold nanoparticles (NP) of 80 nm. Localized fluorescence enhancement was demonstrated by microstructures equipped with tips of sub-micron dimensions. The enhancement was realized by positioning the NP-coated structures over fluorescent protein layers. Two fluorophores with their absorption in the red and in the green region of the VIS spectrum were used. Laser scanning confocal microscopy was used to quantify the enhancement. The enhancement factor was as high as 6 in areas of several square-micrometers and more than 3 in the case of local enhancement, comparable with literature values for similar nanoparticles. The structured pattern of the observed fluorescence intensity indicates a classic enhancement mechanism realized by standing waves over reflecting surfaces. With further development mobile microtools made by TPP and functionalized by metal NPs can be actuated by optical tweezers and position to any fluorescent micro-object, such as single cells to realize localized, targeted fluorescence enhancement.

Original languageEnglish
Pages (from-to)301-309
Number of pages9
JournalOptical Materials
Volume38
DOIs
Publication statusPublished - Dec 1 2014

Fingerprint

Gold
Photons
Fluorescence
gold
Nanoparticles
fluorescence
nanoparticles
microstructure
Microstructure
augmentation
photons
Polymerization
Optical tweezers
Fluorophores
Confocal microscopy
Photoresists
polymerization
Metals
Proteins
Scanning

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Computer Science(all)

Cite this

Gold nanoparticle-mediated fluorescence enhancement by two-photon polymerized 3D microstructures. / Aekbote, Badri L.; Schubert, Félix; Ormos, P.; Kelemen, L.

In: Optical Materials, Vol. 38, 01.12.2014, p. 301-309.

Research output: Contribution to journalArticle

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