A wavevector is a vector that describes the direction and wavelength of a wave, often denoted by the symbol \\textbf{k}. It is essential in understanding how waves propagate through different media, linking to concepts like phase velocity and group velocity, as well as phenomena such as surface plasmon polaritons. The magnitude of the wavevector is inversely related to the wavelength, allowing us to relate spatial characteristics of waves to their propagation behavior.
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