I'm trying to grasp the basic concepts of plasmons and can't quite picture what is going on. When light is incident on small metal nanoparticles, it causes the conduction electrons of the metal to oscillate at the frequency of the photon. Is that a plasmon? Is that also the same as it being referred to a plasmon coupled with a photon (plasmon polariton)? Does one photon generate one plasmon? A few articles I read state that plasmons can pave the way to subwavelength optics. What does this mean and why is it a big deal? What does it mean to confine the light and why is that important? I can see how light propagation would be important, especially in something like data transmission, but how would plasmons play a role? I greatly appreciate any insight that can be shared! Thanks!