Factor of interfacial potential for the surface plasmon-polariton resonance sensor response

• Published in: Semiconductor Physics Quantum Electronics & Optoelectronics
• Date: 2008
• Main Authors: Lopatynskyi, A.M., Lopatynska, O.G., Poperenko, L.V., Chegel, V.I., Guiver, M.D.
• Format: Article
• Language: English
• Published: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2008
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/119075
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Factor of interfacial potential for the surface plasmon-polariton resonance sensor response / A.M. Lopatynskyi, O.G. Lopatynska, M.D. Guiver, L.V. Poperenko, V.I. Chegel // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2008. — Т. 11, № 4. — С. 329-336. — Бібліогр.: 38 назв. — англ.

In this work, we investigate how the application of an external potential
 difference to the sensitive gold-electrolyte interface influences the optical response of a
 sensor based on the surface plasmon-polariton resonance (SPPR). The SPPR resonant
 angle shift was registered for an aqueous solution of sulfuric acid as an electrolyte at
 different potential sweep rates. From the measurements of SPPR curves versus the
 applied voltage, the potential of zero charge of the gold electrode in the electrolyte
 solution was estimated. To explain the external voltage influence on the SPPR sensor
 response, a theoretical model was used that takes into account three factors: free electron
 concentration change in the space-charge layer (SCL) in the surface layer of gold,
 dependence of the capacity of electrical double layer at the interface on the voltage, and
 gold film surface roughness.