Prof. Robert J. Forster Profile

Prof. Robert J. Forster

at Dublin City Univ

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Publications (7)

Proceedings Article | 2 May 2014 Paper

Formation of ferroelectrically defined Ag nanoarray patterns

Signe Damm, N. Craig Carville, Michele Manzo, Katia Gallo, S. Lopez, Tia Keyes, Robert Forster, Brian Rodriguez, James Rice

Proceedings Volume 9126, 91260Y (2014) https://doi.org/10.1117/12.2051908

KEYWORDS: Silver, Luminescence, Nanoparticles, Fluorescence lifetime imaging, Raman spectroscopy, Molecules, Nanostructures, Plasmons, Raman scattering, Atomic force microscopy

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Proceedings Article | 10 May 2012 Paper

Reflectance properties of gold nano-cavity spherical and cuboid molded arrays

Colm Mallon, Robert Forster, Tia Keyes

Proceedings Volume 8424, 84243F (2012) https://doi.org/10.1117/12.948502

KEYWORDS: Gold, Optical spheres, Spherical lenses, Reflectivity, Polymers, Absorbance, Mirrors, Diffuse reflectance spectroscopy, Lithography, Glasses

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Proceedings Article | 8 May 2012 Paper

Membrane permeable luminescent metal complexes for cellular imaging

Ute Neugebauer, Lynda Cosgrave, Yann Pellegrin, Marc Devocelle, Robert Forster, Tia Keyes

Proceedings Volume 8427, 84270C (2012) https://doi.org/10.1117/12.919992

KEYWORDS: Raman spectroscopy, Oxygen, Luminescence, Metals, Photonic integrated circuits, Ruthenium, Environmental sensing, Absorption, Spectroscopy, Fluorescence lifetime imaging

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The spectroscopic and photophysical properties of ruthenium polypyridyl polypeptide conjugates of the type [Ru(bpy)₂PIC-Argn]ⁿ⁺²⁺, where bpy is 2,2-bipyridyl (bpy), PIC is 2-(4-carboxyphenyl)imidazo[4,5- f][1,10]phenanthroline and PIC-Argn is this ligand peptide bonded to polyarginine where n is 5 or 8, is described. The resonance Raman spectroscopy of the peptide conjugated complex and parent are strongly pH dependent and demonstrate a switch of lowest energy charge transfer transition between bpy and pic ligands as s function of pH. The pKa of the imidazole ring on the complex is obtained from resonance Raman spectroscopy as 7.8 ± 0.2. The luminescence lifetime of the complex is strongly oxygen dependent and a Stern-Volmer plot of O₂ quenching for [Ru(bpy)2(PIC-Arg8)]¹⁰⁺ yielded a KSV value of 2300 ± 420 M^-1 which was independent of pH over the range 2 to 11. The complexes, because of their large Stokes shifts can, uniquely, be used under identical conditions of probe concentration and excitation wavelength for resonance Raman and luminescence cellular imaging. Cellular imaging was conducted using SP2 myeloma cells which confirmed that the [Ru(bpy)2(PIC-Arg8)]¹⁰⁺ is readily taken up by mammalian cells although the parent and pentarginine analogues are not membrane permeable. Preliminary examples of multi-parameter imaging using these probes were presented. Resonance Raman maps of [Ru(bpy)₂(PIC-Arg8)]¹⁰⁺ within living myeloma cells showed on the basis of spectral discrimination, attributed to pH, three distinct regions of the cell could be identified, ascribed to the nucleus, the cytoplasm and the membranes. Luminescence lifetime imaging showed quite large variations in the probe lifetime within the living cell which was tentatively ascribed to variation in O₂ concentration about the cell. Preliminary estimates of O₂ concentration were made and it was found that the membranes, both inner and outer are the most O₂ rich regions of the cell. Overall, we propose that such peptide labeled luminescent metal are potentially a valuable addition to cellular imaging by providing tools for multiplexed analysis of the cell environment.

Proceedings Article | 21 September 2011 Paper

Site selective surface enhanced Raman scattering on nanostructured cavity arrays

F. Lordan, J. Rice, B. Jose, R. Forster, T. Keyes

Proceedings Volume 8096, 809623 (2011) https://doi.org/10.1117/12.891282

KEYWORDS: Surface enhanced Raman spectroscopy, Plasmons, Raman spectroscopy, Surface plasmons, Molecules, Nanostructuring, Raman scattering, Gold, Surface plasmon polaritons, Spherical lenses

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Proceedings Article | 14 February 2007 Paper

Noninvasive noble metal nanoparticle arrays for surface-enhanced Raman spectroscopy of proteins

Obianuju Inya-Agha, Robert Forster, Tia Keyes

Proceedings Volume 6450, 64500T (2007) https://doi.org/10.1117/12.725068

KEYWORDS: Surface enhanced Raman spectroscopy, Proteins, Silicon, Nanoparticles, Metals, Raman spectroscopy, Gold, Particles, Chemical analysis, Electromagnetism

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Proceedings Article | 3 June 2005 Paper

Luminescence properties of metallopolymer-gold nanoparticle composites

Robert Forster, Lynn Dennany, Michael Seery, Tia Keyes

Proceedings Volume 5825, (2005) https://doi.org/10.1117/12.606155

KEYWORDS: Osmium, Luminescence, Nanoparticles, Gold, Polymers, Thin films, Composites, Nanocomposites, Particles, Metals

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Proceedings Article | 3 June 2005 Paper

New insights into the molecular mechanisms of thrombosis from high resolution surface enhanced Raman microscopy

Tia Keyes, Deirdre Leane, Robert Forster, Niamh Moran, Dermot Kenny

Proceedings Volume 5826, (2005) https://doi.org/10.1117/12.605333

KEYWORDS: Proteins, Surface enhanced Raman spectroscopy, Gold, Raman spectroscopy, Blood, Blood vessels, Metals, Nanoparticles, Electrodes, Molecular mechanisms

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