Detecting molecules using a surface impedance imaging technique

Author

Foley, Kyle J. ; Shan, Xiaonan ; Tao, Nongjian

Author_Institution

Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ

fYear

2009

fDate

9-10 April 2009

Firstpage

156

Lastpage

158

Abstract

We demonstrate here a surface impedance imaging technique based on the local surface charge density influencing the surface plasmon resonance (SPR) measurement. Three images are captured of the entire surface: a DC steady-state image, an AC intensity image and an AC phase image. The DC image gives the standard SPR information on thickness. The AC intensity and phase images display information related to the surface impedance. This allows for the surface charge modulation created by the electrochemical potential modulation to be imaged optically.

Keywords

electric impedance imaging; electrochemical analysis; surface impedance; surface plasmon resonance; AC intensity image; AC phase image; DC steady state image; SPR information; electrochemical potential modulation; local surface charge density; molecule detection; surface charge modulation; surface impedance imaging technique; surface plasmon resonance measurement; Charge measurement; Current measurement; Density measurement; Displays; Impedance measurement; Optical imaging; Plasmons; Resonance; Steady-state; Surface impedance;

fLanguage

English

Publisher

ieee

Conference_Titel

Life Science Systems and Applications Workshop, 2009. LiSSA 2009. IEEE/NIH

Conference_Location

Bethesda, MD

Print_ISBN

978-1-4244-4292-8

Electronic_ISBN

978-1-4244-4293-5

Type

conf

DOI

10.1109/LISSA.2009.4906733

Filename

4906733