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LB‐film‐deposited optical channel waveguides with sensing functions
Author(s) -
Fushen Chen
Publication year - 1997
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(19970605)15:2<116::aid-mop16>3.0.co;2-8
Subject(s) - waveguide , microwave , refractive index , materials science , optics , channel (broadcasting) , transmission line , transmission (telecommunications) , optoelectronics , telecommunications , physics , engineering
The optical channel waveguide we study consists of a Ti‐diffused LiNbO 3 optical waveguide with a Langmuir‐Blodgett (LB) film deposited on the surface. The transmission‐line theory and effective index method are applied to the analysis of the waveguide transmission to obtain its characteristic equations. The calculation results show that refractive index changes of the LB film can cause a change of the propagation constants of a guided mode, which can be used in a gas‐sensing device. Experimental work has been done, and its results are given to examine the sensing properties of the LB‐film‐covered waveguide. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 15: 116–120, 1997.