Abstmet
Propagation of ra&ation 111 wavegmdes LS theoretlcally described by Maxwell's equations The gradrent of refractnre mdex and an mfluence on the wavegmde by a superstrate requires a numerical solution of the dtierentlal equation Iterative methods such as the Runge-Kutta approaches or quantum mechamc equations (WKBJ) are used to calculate the effectwe refractwe mdex m the wavegmde dependmg on the superstrate's and the wavegmde's local refractwe mdlces Gases penetratmg a polymer which acts as a superstrate changes the effc&ve refractwe mdex. The preclslon of both the numerical approaches has been tested The calculations avold the tune consummg measurements required to detemune optmuzed wavegulde structures and superstrate consistence smtable for observmg polymer/gas mteradons
The calculated fields of the TEoO modes gwe mformatlon about the propertles of the polymer-gas-polymer Iteration, and the propagation of the hght m the wavegulde The results provide a better understandmg of polymer-gas mteractlon and the dew&s applrcatlon to sensors The advantages and disadvantages of the various approaches are discussed and an application of an integrated opt& sensor for halogenated hydrocarbons IS given Keywor& Modal fields, Optic devuzs, Refractive mdex