| This article is based on the structure of symmetrical metal-cladding waveguide(SMCW), and researches the applications of Goos-H nchen (GH) shift. Respectively, itis introduced and analysis the new type of electro-optic switch and temperaturesensor. The GH shift is the actual distances that between the point of reflection andincident, when the light was total reflection on the interface of two kinds of medium.So far, there are still many scientists thought lots of ways to enhance GH shift inorder to realize the precise measurement. As the common medium of GH shift,SMCW has a very prominent advantages and wide application. For example, thelight signals can be coupled with the metal film on the surface of the waveguide, soit can be transmitted into the guiding layer; In addition, when the thickness ofguiding layer achieve sub millimeter scale, the ultrahigh-order mode is easilyaffected at the guiding layer. Especially, it could be changed when the thickness orrefractive index (RI) of the guiding layer is change.A new type of electro-optic switch uses the classical structure of SMCW, thecoupling layer and the substrate layer is made of sputtering method of metallic silverfilm (Ag), the dielectric layer to use new electro-optic material PMN-PT crystal asthe guiding layer. To compare with the traditional electro-optic material, lithiumniobate crystal (LiNbO3), it is had obvious electro-optic effect, high stability, goodreliability, low optical loss, and many other advantages. When the electro-opticswitch in strong electric field environment, the electro-optic coefficient andpiezoelectric coefficient of the guiding layer would be increasing or decreasing, thethickness and RI of the guiding layer are also changed, too. It is result in the GHshift change at last. If we add a receiving device (three-pinhole array) at thereceiving terminal of the light signals, and using the control action of electric field,then we can make the electro-optic switch to achieve1×3effect. The electro-opticswitch has short response time and the signal would not be interference.A new type of temperature sensor uses the classical structure of SMCW, too.The coupling layer and the substrate layer are made of sputtering method of goldfilm (Au), the guiding layer use BK7glass as the sensing layer. When thetemperature rise or fall, the thermo-optic coefficient and thermal expansioncoefficient of the guiding layer would be increasing or decreasing, too. It is result in the GH shift change at last. The temperature sensor has high sensitivity and wouldnot be affected by electromagnetic environment. In theory, the resolution of thetemperature sensor can reach0.005degrees Celsius. |
