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High Quality Content by WIKIPEDIA articles! Plasmons can be described in the classical picture as an oscillation of free electron density against the fixed positive ions in a metal. To visualize a plasma oscillation, imagine a cube of metal is placed in an external electric field to the right. Electrons will move to the left side (uncovering positive ions on the right side) until they cancel the field inside the metal. Now we switch the electric field off, and the electrons move to the right, repelled by each other and attracted to the positive ions left bare on the right side. They oscillate ...
High Quality Content by WIKIPEDIA articles! Plasmons can be described in the classical picture as an oscillation of free electron density against the fixed positive ions in a metal. To visualize a plasma oscillation, imagine a cube of metal is placed in an external electric field to the right. Electrons will move to the left side (uncovering positive ions on the right side) until they cancel the field inside the metal. Now we switch the electric field off, and the electrons move to the right, repelled by each other and attracted to the positive ions left bare on the right side. They oscillate back and forth at the plasma frequency until the energy is lost in some kind of resistance or damping. Plasmons are a quantization of this kind of oscillation.
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