Mr. Alfred Leitner Profile

Alfred Leitner

at Karl-Franzens-Univ Graz

SPIE Involvement:

Author

Publications (8)

SPIE Journal Paper | 1 October 2006

Role of granular structure in metal layers on the optical properties of absorbing mirrors

H. Walter, G. Bauer, Ralph Domnick, Georg Jakopic, Alfred Leitner

OE, Vol. 45, Issue 10, 103801, (October 2006) https://doi.org/10.1117/12.10.1117/1.2363167

KEYWORDS: Metals, Silver, Nanoparticles, Mirrors, Absorption, Particles, Optical properties, Reflectivity, Optical engineering, Plasmons

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Proceedings Article | 15 July 2004 Paper

Optical properties of tailor-made 1D and 2D noble metal particle arrays

Alfred Leitner, Bernhard Steinberger, Joachim Krenn, Harald Ditlbacher, Andreas Hohenau, Franz Aussenegg

Proceedings Volume 5339, (2004) https://doi.org/10.1117/12.537433

KEYWORDS: Particles, Luminescence, Metals, Molecules, Nanoparticles, Optical properties, Polarization, Plasmons, Near field optics, Absorption

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Proceedings Article | 15 July 2004 Paper

Cluster optical coding: from biochips to counterfeit security

Jakob Haglmueller, Yilmaz Alguel, Christian Mayer, Viacheslav Matyushin, Georg Bauer, Fritz Pittner, Alfred Leitner, Franz Aussenegg, Thomas Schalkhammer

Proceedings Volume 5339, (2004) https://doi.org/10.1117/12.537429

KEYWORDS: Metals, Proteins, Gold, Silver, Particles, Absorption, Ocean optics, Plasmons, Coating, Mirrors

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Spatially tuned resonant nano-clusters allow high local field enhancement when exited by electromagnetic radiation. A number of phenomena had been described and subsequently applied to novel nano- and bionano-devices. Decisive for these types of devices and sensors is the precise nanometric assembly, coupling the local field surrounding a cluster to allow resonance with other elements interacting with this field. In particular, the distance cluster-mirror or cluster-fluorophore gives rise to a variety of enhancement phenomena. High throughput transducers using metal cluster resonance technology are based on surface-enhancement of metal cluster light absorption (SEA). The optical property for the analytical application of metal cluster films is the so-called anomalous absorption. At a well defined nanometric distance of a cluster to a mirror the reflected electromagnetic field has the same phase at the position of the absorbing cluster as the incident fields. This feedback mechanism strongly enhances the effective cluster absorption coefficient. The system is characterised by a narrow reflection minimum. Based on this SEA-phenomenon (licensed to and further developed and optimized by NovemberAG, Germany Erlangen) a number of commercial products have been constructed. Brandsealing(R) uses the patented SEA cluster technology to produce optical codings. Cluster SEA thin film systems show a characteristic color-flip effect and are extremely mechanically and thermally robust. This is the basis for its application as an unique security feature. The specific spectroscopic properties as e.g. narrow band multi-resonance of the cluster layers allow the authentication of the optical code which can be easily achieved with a mobile hand-held reader developed by november AG and Siemens AG. Thus, these features are machine-readable which makes them superior to comparable technologies. Cluster labels are available in two formats: as a label for tamper-proof product packaging, and as a direct label, where label and logo are permanently applied directly and unremovable to the product surface. Together with Infineon Technologies and HUECK FOLIEN, the SEA technology is currently developed as a direct label for e.g. SmartCards.

Proceedings Article | 19 November 2003 Paper

Plasmon modes in elongated gold nanoparticles

G. Schider, J. Krenn, Alfred Leitner, Franz Aussenegg, William Schaich

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.525479

KEYWORDS: Plasmons, Nanoparticles, Gold, Particles, Metals, Silver, Near field optics, Visible radiation, Glasses, Optical properties

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Proceedings Article | 3 June 1999 Paper

Optical nanocluster microchips for human diagnostics

Georg Bauer, Sabine Volnov, Gerhard Sontag, Alfred Leitner, Franz Aussenegg, Fritz Pittner, Thomas Schalkhammer

Proceedings Volume 3606, (1999) https://doi.org/10.1117/12.350060

KEYWORDS: Polymers, Metals, Sensors, Ions, Mirrors, Absorption, Diagnostics, Reflection, Plasma, Polymer thin films

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Proceedings Article | 1 May 1998 Paper

Optical nanocluster plasmon sensors as transducers for bioaffinity interactions

Thomas Schalkhammer, Alfred Leitner, Franz Aussenegg, Georg Bauer, Fritz Pittner

Proceedings Volume 3253, (1998) https://doi.org/10.1117/12.308025

KEYWORDS: Metals, Sensors, Polymers, Gold, Proteins, Absorption, Optical properties, Silver, Oxygen, Plasma

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Proceedings Article | 16 June 1997 Paper

Detection of fluorophore-labeled antibodies by surface-enhanced fluorescence on metal nanoislands

Thomas Schalkhammer, Franz Aussenegg, Alfred Leitner, Harald Brunner, Gerhard Hawa, Christina Lobmaier, Fritz Pittner

Proceedings Volume 2976, (1997) https://doi.org/10.1117/12.275521

KEYWORDS: Luminescence, Metals, Particles, Quantum efficiency, Absorption, Atmospheric particles, Nanoparticles, Silver, Glasses, Plasma

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Proceedings Article | 29 September 1995 Paper

New urea sensor based on a metal island coated ion sensitive swelling polymer device

Thomas Schalkhammer, Christina Lobmaier, Fritz Pittner, Alfred Leitner, Harald Brunner, Franz Aussenegg

Proceedings Volume 2508, (1995) https://doi.org/10.1117/12.221723

KEYWORDS: Polymers, Metals, Sensors, Ions, Reflectivity, Polymer thin films, Mirrors, Urea, Reflection, Biosensors

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Showing 5 of 8 publications

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