Prof. Brian D. MacCraith Profile

Prof. Brian D. MacCraith

President at Dublin City Univ

SPIE Involvement:

Fellow status | Conference Program Committee | Conference Chair | Author

Publications (44)

SPIE Journal Paper | September 1, 2008

Experimental and theoretical evaluation of surface plasmon-coupled emission for sensitive fluorescence detection

Trnavsky, Michal , Enderlein, Jörg , Ruckstuhl, Thomas , McDonagh, Colette , MacCraith, Brian

JBO Vol. 13 Issue 05

KEYWORDS: Luminescence, Metals, Molecules, Silica, Data modeling, Surface plasmons, Silver, Glasses, Fluorescence spectroscopy, Refractive index

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SPIE Journal Paper | January 1, 2008

Breath-by-breath measurement of oxygen using a compact optical sensor

Burke, Conor , Moore, John , Wencel, Dorota , McEvoy, Aisling , MacCraith, Brian

JBO Vol. 13 Issue 01

KEYWORDS: Sensors, Oxygen, Luminescence, Optical sensors, Printing, Calibration, Sol-gels, Sensor performance, Ruthenium, Humidity

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PROCEEDINGS ARTICLE | October 19, 2006

Exploiting sensor cross sensitivity: achieving temperature compensation via a dual-element optical oxygen sensor

Proc. SPIE. 6377, Advanced Environmental, Chemical, and Biological Sensing Technologies IV

KEYWORDS: Sensors, Oxygen, Calibration, Temperature metrology, Luminescence, Modulation, Data processing, Sol-gels, Sensor calibration, Chemical fiber sensors

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Temperature compensation is a key issue that must be addressed in almost all sensors and is particularly relevant to chemical sensor systems. Although independent temperature measurement coupled with temperature calibration of the chemical sensor can be employed to address this issue, the difficulty of accurate temperature measurement of the sensor material remains a problem. We report here a novel solution to this issue and prove the principle in the context of optical oxygen sensing. The measurement technique involves the use of two temperature-calibrated, fluorescence based oxygen sensors that display different sensitivities to oxygen. The mathematical representation of this dual-element sensor results in a system of two equations that can be solved for both oxygen concentration and temperature. A numerical technique based on successive approximation has been developed that allows the use of non-linear calibration equations, which accurately describe the responses of the sensor membranes used and, therefore, yield accurate values for oxygen concentration and temperature. The oxygen sensitive membranes in question consist of the oxygen-sensitive, fluorescent ruthenium complex, [Ru(II)- tris(4,7-diphenyl-1,10-phenanthroline)]2+, (Ru(dpp)3 2+), immobilised in a porous sol-gel matrix. Sol-gel matrices that were derived from different precursors were used to yield membranes with different sensitivities. 3D calibration surfaces were generated for both sensor membranes using a temperature-controlled flow cell, yielding calibration equations with R2 values of > 0.9999 in both cases. This provides the system with a high degree of baseline accuracy. The principle of operation of the system has been verified experimentally. This has significant implications for the development of optical sensors, as the use of such a technique obviates the need for separate temperature measurement devices such as thermistors or thermocouples. While the technique has been demonstrated here using phase fluorometric oxygen sensors, it is applicable to a broad range of measurement situations,

PROCEEDINGS ARTICLE | November 9, 2005

Development of a multi-analyte integrated optical sensor platform for indoor air-quality monitoring

Proc. SPIE. 5993, Advanced Environmental, Chemical, and Biological Sensing Technologies III

KEYWORDS: Sensors, Oxygen, Humidity, Luminescence, Signal detection, Waveguides, Sol-gels, Optical sensors, Chlorine, Modulation

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PROCEEDINGS ARTICLE | November 8, 2005

Characterisation of novel refractometric sensing systems

Proc. SPIE. 5993, Advanced Environmental, Chemical, and Biological Sensing Technologies III

KEYWORDS: Sensors, Refractive index, Waveguides, Humidity, Sol-gels, Silicon, Sensing systems, Single mode fibers, Directional couplers, Ultraviolet radiation

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SPIE Conference Volume | June 3, 2005

Opto-Ireland 2005: Optical Sensing and Spectroscopy

PROCEEDINGS ARTICLE | June 3, 2005

Novel hybrid sol-gel materials for smart sensor windows

Proc. SPIE. 5826, Opto-Ireland 2005: Optical Sensing and Spectroscopy

KEYWORDS: Oxygen, Sensors, Sol-gels, Glasses, Humidity, Ruthenium, Luminescence, Optical sensing, Matrices, Diffusion

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PROCEEDINGS ARTICLE | June 3, 2005

Novel polymer platform for enhanced biochip performance

Proc. SPIE. 5826, Opto-Ireland 2005: Optical Sensing and Spectroscopy

KEYWORDS: Luminescence, Polymers, Sensors, Biosensors, Glasses, Fluorescence spectroscopy, Interfaces, Optical biosensors, Molecules, CMOS cameras

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PROCEEDINGS ARTICLE | June 2, 2005

Plasmonic enhancement using core-shell nanoparticles

Proc. SPIE. 5824, Opto-Ireland 2005: Nanotechnology and Nanophotonics

KEYWORDS: Nanoparticles, Luminescence, Silica, Gold, Plasmons, Silver, Dielectrics, Absorption, Metals, Neptunium

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PROCEEDINGS ARTICLE | September 15, 2004

Plasmonic enhancement of fluorescence for sensor applications

Proc. SPIE. 5450, Photonic Crystal Materials and Nanostructures

KEYWORDS: Luminescence, Metals, Quantum efficiency, Absorption, Nanoparticles, Glasses, Lead, Plasmonics, Sensors, Plasmons

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PROCEEDINGS ARTICLE | August 18, 2004

Thermo-optic switches using sol-gel processed hybrid materials

Proc. SPIE. 5451, Integrated Optics and Photonic Integrated Circuits

KEYWORDS: Switches, Switching, Electrodes, Thermal optics, Brain-machine interfaces, Waveguides, Directional couplers, Sol-gels, Interferometers, Refractive index

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PROCEEDINGS ARTICLE | August 27, 2003

Optical cure monitoring for process and quality control in DVD manufacture