1Chapter 7Polarization and Modulation of Light27.1 PolarizationA. State of Polarization3xyzEyEx−yEy^xEx^(a)(b)(c)EPlane of polarizationx^y^E(a) A linearly polarized wave has its electric field oscillations defined along a lineperpendicular to the direction of propagation, z. The field vector Eand z define a plane ofpolarization. (b) The E-field oscillations are contained in the plane of polarization. (c) Alinearly polarized light at any instant can be represented by the superposition of two fields Exand Eywith the right magnitude and phase.E?1999 S.O. Kasap, Optoelectronics (Prentice Hall)0ˆˆxoyoExEyE=−4• Polarization•Linearly polarized•Plane polarized• Unpolarized• Polarizer• Add electric field components vectoriallycos()xxoEEtkzω=−cos()yyoEEtkzωφ=−+(1)(2)ˆˆˆˆcos()cos()xyxoyoExEyExEtkzyEtkzωω=+=−−−cos()oEEtkzω=−0ˆˆxoyoExEyE=−
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