Title :
A theoretical evaluation of the absorption coefficient of the optical waveguide chemical or biological sensors by group index method
Author :
Qing, De-Kui ; Chen, Xiao-Min ; Itoh, Kiminori ; Murabayashi, Masayuki
Author_Institution :
Inst. of Environ. Sci. & Technol., Yokohama Nat. Univ., Japan
fDate :
8/1/1996 12:00:00 AM
Abstract :
In this paper, an approach which we refer to as group index method was proposed to evaluate the absorption coefficient of the optical waveguide chemical or biological sensors. In this method, the absorption coefficient is regarded as mainly determined by the group index and the power fraction in the region of an absorptive medium. The absorption coefficient of the normal plane wave absorption; of the evanescent wave absorption which includes the type of open clad, buffered clad and sensing layer; and of the guided wave absorption for TE modes were investigated by this method. Some suggestions for optimizing the structure of the optical waveguide sensors were given
Keywords :
absorption coefficients; biosensors; chemical sensors; claddings; integrated optics; optical films; optical sensors; optical waveguide theory; optimisation; refractive index; TE modes; absorption coefficient; absorptive medium; biological sensors; biosensors; buffered clad; chemical sensors; evanescent wave absorption; group index; group index method; guided wave absorption; normal plane wave absorption; open clad; optical waveguide sensors; power fraction; sensing layer; theoretical evaluation; Absorption; Biomedical optical imaging; Biosensors; Chemical and biological sensors; Optical buffering; Optical sensors; Optical surface waves; Optical waveguide theory; Optical waveguides; Tellurium;
Journal_Title :
Lightwave Technology, Journal of
