Design of nonlinear surface wave guided sensors

M. M. Abadla; M. M. Shabat

doi:10.1117/12.633911

8 June 2005 Design of nonlinear surface wave guided sensors

M. M. Abadla, M. M. Shabat

Proceedings Volume 5851, Fundamental Problems of Optoelectronics and Microelectronics II; (2005) https://doi.org/10.1117/12.633911
Event: Fundamental Problems of Optoelectronics and Microelectronics II, 2004, Khabrovsk, Russian Federation

Abstract

In recent years, optical wave guided sensors have attracted scientists for the development of biochemical and biomedical optical sensors in addition to optical communicative devices. These sensors show immunity to electromagnetic fields and have no danger of ignition so that they are used in cases of risky environments. Optical sensors have additional advantages: higher sensitivity, higher stability and lower price. Surface sensing, in particular, is used in recognition of adsorption or deposition on a certain surface such as the detection of adsorbed proteins, antibodies and bacteria cells. In this work, a sensing layer (extra ultra-thin film) iss assumed to rest on surface of a thin film covered with a nonlinear clad of lief dependent refractive index. A normalized analysis for the design of evanescent wave sensors is carried out for linear waveguide sensors with normal asymmetry (i.e., substrate refractive index is higher than that of clad). Sensitivity of such sensors is evaluated and the condition for them to achieve maximum sensing is also introduced. A computer program was developed for the computation and then plotting results in the so called universal charts from which one can specify the appropriate dimension for the required sensor.

Citation Download Citation

M. M. Abadla and M. M. Shabat "Design of nonlinear surface wave guided sensors", Proc. SPIE 5851, Fundamental Problems of Optoelectronics and Microelectronics II, (8 June 2005); https://doi.org/10.1117/12.633911

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