Monday, 20 July 2020

electromagnetism - The Goos Hanchen shift mechanism


When the light is totally reflected in the interface between dense and less-dense medium, we know that the reflected beam will shift a little. Currently I have known the reflection coef r, will be a complex number and its phase angle will vary with the incident angle theta. Some paper explained this phenomenon as the light penetrates the less-dense medium a little, and re-emerge again, just like it is reflected by some virtual plane in the less-dense, but how can this be explained? Or by what mechanism?




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