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O. Jaksic, Z. Jaksic, J. Matovic:
"Adsorption-Desorption Noise in Plasmonic Chemical/Biological Sensors in Multiple Analyte Environment";
Vortrag: SPIE Europe: Microtechnologies for the New Millennium, Dresden, Deutschland; 04.05.2009 - 08.05.2009; in: "Proceedings of SPIE", Society of Photo-Optical Instrumentation Engineers (SPIE), 7362 (2009).

We analyzed the intrinsic noise of plasmonic sensors caused by the adsorption-desorption of gaseous analytes on the sensor surface. We analyzed a general situation when there is a larger number of different species in the environment. We developed our model and applied it to calculate various analyte mixtures, including some environmental pollutants, toxic and dangerous substances. The spectral density of mean square refractive index fluctuations follows a dependence similar to that of generation-recombination noise in photodetectors, flat at lower frequencies and sharply decreasing at
higher. Some of the calculated noise levels are well within the detection range of conventional surface plasmon resonance sensors. One of the obvious conclusions is that AD noise may be an important limiting factor in monitoring process kinetics by nanoplasmonic sensors. An AD noise peak is observed in temperature dependence of mean square refractive index fluctuations, thus sensor operating temperature may be optimized to obtain larger signal to noise ratio. A
significant property of AD noise is its increase with the plasmon sensor area decrease, which means that it will be even more pronounced in modern nanoplasmonic devices. Our consideration is valid both for conventional surface plasmon resonance devices and for general nanoplasmonic devices. This research could be of importance in diverse areas such as environmental sensing, homeland security, forensic applications, life sciences, etc.

Nanophotonics, Nanoplasmonics, Surface Plasmon Polaritons, Adsorption-Desorption, Noise, Signal Fluctuations, Sensors, Chemical Sensing