Two independent incident light polarization directions, termed p and s, are possible. ![]() ![]() A pair of radio buttons is utilized to toggle between the incident light polarization directions, p and s, which invoke a corresponding change in the evanescent field polarization. The incident angle can be altered from a range of zero to 72 degrees with the Incident Angle slider. Rotation of the tutorial about the z-axis is accomplished with the View Angle slider, which will enable up to a 90-degree change in viewing angle. The electric and magnetic field components of the evanescent waves are indicated by arrows or dots (perpendicular to the plane of the browser window) in the tutorial. Penetration of a portion of the incident light into the low refractive index medium creates the evanescent field, which is represented by several smaller light waves propagating parallel to the interface and having decreased intensity with increasing distance from the interface. The tutorial initializes with an single incident light ray (positioned at a 64 degree angle from the normal) undergoing total internal reflection at a glass/water interface having refractive indices of 1.518 and 1.333, respectively. This tutorial explores how changes in the incident angle affect evanescent wave intensity and the relationships between the electric field vectors of parallel and perpendicular components of the incident beam. The I(o) intensities observed for polarized vibration vectors are discussed in terms of a coordinate system with the plane of incidence (the x-z plane) defined as being parallel to the exciting light beam. ![]() Evanescent Field Polarization and Intensity Profiles - Java TutorialĮvanescent wave intensity at the interface surface ( I(o)) is a function of both the incident angle and the polarization components of the light beam.
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