12 November 1999 Control of electromagnetic wave by modulation of medium parameters by finite packet pulses
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Abstract
Transformation of electromagnetic wave in a medium which permittivity and conductivity is being modulated by a finite packet of periodic rectangular pulses is considered. There are not restrictions on duration and amplitude of modulation pulses as well as on an initial wave amplitude and frequency. It is shown that the initial electromagnetic wave is split by a pulse packet into two waves, direct and inverse, with the same frequency as the initial wave has. The amplitudes of these waves depend on a number of pulses and its duration as well as on medium parameters very strong. There are such parameters that the secondary waves can be amplified but the amplification is absent when a medium conductivity changes only. It is revealed that wave amplitudes can change irregularly with the pulse number. Irregular behavior of amplitudes has intermittent character when a slight changing of the amplitude alternates with great amplitude peaks. This process is controlled by a generalized parameter an expression for which is derived. The criteria for monotonous or irregular behavior of the secondary wave amplitudes is derived.
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Alexander G. Nerukh, Igor Scherbatko, "Control of electromagnetic wave by modulation of medium parameters by finite packet pulses", Proc. SPIE 3795, Terahertz and Gigahertz Photonics, (12 November 1999); doi: 10.1117/12.370216; https://doi.org/10.1117/12.370216
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