Bottles have one commonly known form of acoustic resonance, but double-walled bottles have a second, and exploring their interactions can teach students about vibrations and oscillations.

Fig. 1. The dielectric response models for conventional dielectric materials and for metamaterials. For conventional dielectric materials, there are three types of polarization models: Drude model for ...

Surface plasmons are collective oscillations of free electrons that occur at the interface between a metal and a dielectric medium, such as air or glass. These oscillations are coupled with ...