Mounted nanoporous anodic alumina thin Films as planar optical waveguides

T. D. Lazzara, K. H. A. Lau, W. Knoll

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Solid-supported thin films of self-organized nanoporous anodic aluminum oxide (AAO) have been widely employed for the template preparation of nanostructured functional materials. Recently, the use of nanoporous AAO thin films in optical waveguide spectroscopy (OWS) has been explored for high sensitivity, in situ monitoring of processes occurring within these nanoporous templates. In this contribution, we demonstrate a strategy for mounting bulk anodized AAO thin films on heterogeneous solid-supports suitable for waveguide sensing experiments. Unlike conventional preparations of AAO thin films by anodization of vacuum- or electrochemically deposited Al thin films, the full range of techniques available to anodize bulk Al may potentially be applied with the present method. Moreover, we show that AAO thin films mounted on glass substrates can have superior waveguide coupling properties compared to conventionally prepared samples. The nanostructure of the AAO can be well characterized by an EMT-OWS analysis, demonstrated by comparing scanning electron microscopy images of the AAO and the pore dimensions calculated from an effective medium theory (EMT) analysis of the film refractive index measured by OWS. Finally, using a curved metallic substrate as an example, we show that our mounting technique can be used as a general strategy to functionalize objects with nanoporous AAO films.
LanguageEnglish
Pages4293-4299
Number of pages7
JournalJournal of Nanoscience and Nanotechnology
Volume10
Issue number7
DOIs
Publication statusPublished - Jul 2010

Fingerprint

Planar waveguides
Aluminum Oxide
Optical waveguides
optical waveguides
Alumina
aluminum oxides
Aluminum
Thin films
Oxide films
thin films
Spectroscopy
mounting
Mountings
Oxides
Waveguides
templates
spectroscopy
waveguides
preparation
Functional materials

Keywords

  • anodization
  • Porous
  • Substrate
  • Anodic
  • Alumina
  • Free-Standing
  • Waveguide
  • Spectroscopy
  • Template
  • Effective
  • Medium
  • Theory
  • porous alumina
  • in-situ fabrication
  • membranes
  • arrays
  • oxide
  • shape
  • size
  • microstructure

Cite this

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title = "Mounted nanoporous anodic alumina thin Films as planar optical waveguides",
abstract = "Solid-supported thin films of self-organized nanoporous anodic aluminum oxide (AAO) have been widely employed for the template preparation of nanostructured functional materials. Recently, the use of nanoporous AAO thin films in optical waveguide spectroscopy (OWS) has been explored for high sensitivity, in situ monitoring of processes occurring within these nanoporous templates. In this contribution, we demonstrate a strategy for mounting bulk anodized AAO thin films on heterogeneous solid-supports suitable for waveguide sensing experiments. Unlike conventional preparations of AAO thin films by anodization of vacuum- or electrochemically deposited Al thin films, the full range of techniques available to anodize bulk Al may potentially be applied with the present method. Moreover, we show that AAO thin films mounted on glass substrates can have superior waveguide coupling properties compared to conventionally prepared samples. The nanostructure of the AAO can be well characterized by an EMT-OWS analysis, demonstrated by comparing scanning electron microscopy images of the AAO and the pore dimensions calculated from an effective medium theory (EMT) analysis of the film refractive index measured by OWS. Finally, using a curved metallic substrate as an example, we show that our mounting technique can be used as a general strategy to functionalize objects with nanoporous AAO films.",
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Mounted nanoporous anodic alumina thin Films as planar optical waveguides. / Lazzara, T. D.; Lau, K. H. A.; Knoll, W.

In: Journal of Nanoscience and Nanotechnology, Vol. 10, No. 7, 07.2010, p. 4293-4299.

Research output: Contribution to journalArticle

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