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Biosensors & Bioelectronics 15 (2000) 283289 High sensitivity waveguide grating sensor based on radiative losses
 

Summary: Biosensors & Bioelectronics 15 (2000) 283289
High sensitivity waveguide grating sensor based on radiative losses
Vladimir Kochergin *, Ivan Avrutsky, Yang Zhao
Department of Electrical and Computer Engineering, Wayne State Uni6ersity, Detroit, MI 48202, USA
Received 20 October 1999; accepted 17 May 2000
Abstract
A scheme of a waveguide sensor utilizing an output grating coupler with the grating length less than the coupling length is
analyzed. This is the new method for the evaluation of average thickness of the adsorbed layer. This method, based on
measurements of radiation loss coefficients, is proposed. Sensitivity limits of such a scheme are discussed. The new scheme has
strong response on formation on the adsorbed layer and relatively weaker response on the fluctuations of temperature and analyte
concentration. New possibilities for multiparameter sensing are shown. 2000 Elsevier Science S.A. All rights reserved.
Keywords: Waveguide; Grating coupler; Radiation losses; Sensors
www.elsevier.com/locate/bios
1. Introduction
Applications of grating couplers in biological and
chemical sensing are well known Lukosz et al., 1991;
Nellen and Lukosz, 1993; Brandenberg and Gombert,
1993; Clerc and Lukosz, 1997. High sensitivity and real
time data analysis Brecht and Gauglitz, 1998 provide the
great interest in this type of sensors nowadays. However,

  

Source: Avrutsky, Ivan - Department of Electrical and Computer Engineering, Wayne State University

 

Collections: Engineering