Special Section on Mediterranean Nanophotonics

Performance limits to the operation of nanoplasmonic chemical sensors: noise-equivalent refractive index and detectivity

[+] Author Affiliations
Zoran Jaksic

IHTM Institute of Microelectronic Technologies and Single Crystals, Belgrade University, Njegoseva 12, Belgrade, Serbia 11000 Serbia-Montenegro

Olga Jaksic

School of Electrical Engineering "Nikola Tesla", Maksima Gorkog 7, Panc?evo, Serbia 26000 Serbia-Montenegro

Jovan Matovic

Institute of Sensors and Actuator Systems, Vienna University of Technology, Floragasse 7/ E366, Vienna, A 1040 Austria

J. Nanophoton. 3(1), 031770 (April 6, 2009). doi:10.1117/1.3124792
History: Received January 14, 2009; Revised March 26, 2009; Accepted March 30, 2009; April 6, 2009; Online April 06, 2009
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Abstract

We considered figures of merit for chemical and biological sensors based on plasmonic structures and utilizing adsorption/desorption mechanism. The operation of these devices in general is limited by noise determining the minimum detectable refractive-index change. We dedicated our work to the intrinsic noise mechanisms connected with the plasmonic process itself. In contrast, most of the available literature is almost exclusively dedicated to the external noise sources (illumination source and photodetector). Reviewing the refractive-index fluctuations caused by thermal, adsorption-desorption and 1/f noise, we observed a striking analogy between the qualitative behavior of noise in (nano)plasmonic devices and that in semiconductor infrared detectors. The power spectral densities for noise in both of these have an almost identical shape; the adsorption-desorption noise corresponds to generation-recombination processes in detectors, while the other two mechanisms exist in the both types of the devices. Thus the large and mature existing apparatus for infrared detector noise analysis may be applied to the plasmonic sensors. Based on the observed analogy, we formulated the noise-equivalent refractive-index and the specific detectivity as the figures of merit to analyze the ultimate performance of plasmon sensors. The approach is valid for conventional surface plasmon resonance sensors, but also for nanoplasmonic and metamaterial-based devices.

© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Zoran Jaksic ; Olga Jaksic and Jovan Matovic
"Performance limits to the operation of nanoplasmonic chemical sensors: noise-equivalent refractive index and detectivity", J. Nanophoton. 3(1), 031770 (April 6, 2009). ; http://dx.doi.org/10.1117/1.3124792


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