Being irradiated by P light that has a special wavelength, the electrons on the surface of the metal film will absorb the power and change the way of their original movement.

• 在某一特定的波长的P光激励下，电子吸收了光子的能量而改变了原来的运动方式，当激励的光信号与电子群的固有振荡频率一致时，大量的电子振动变为一种谐振。