Abstract

Complex harmonic plane waves, which are characterized by a complex wave-vector and a complex frequency, may be divided into homogeneous plane waves (having parallel propagation and attenuation vectors) and nonhomogeneous or inhomogeneous plane waves. The last ones may be evanescent plane waves (having perpendicular propagation and attenuation vectors) or heterogeneous plane waves (the propagation and attenuation vectors being neither parallel nor perpendicular). All these waves may be either permanent ones or transient ones.

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