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High-energy-density electron-positron pair plasma production and its dynamicsin a thin foil illuminated by two counter-propagating laser pulses areinvestigated through multi-dimensional particle-in-cell simulations. We comparethe production of electron-positron pairs and gamma-photons via quantumelectrodynamics processes in the relativistic transparent and opaque regimes,and find that the target transparency can significantly enhance theelectron-positron pair production due to the formation of stable standing wave(SW). An optimum foil density of 200 - 280 n_c (n_c is the laser criticaldensity) is found for enhancing electron-positron pair production when laserintensity reaches a few 10e23 W/cm2. At such foil density, laser energyconversion to electron-positron pairs is approximately four times higher thanat foil density of 710n_c, whereas laser energy conversion to gamma-photonskeeps almost the same. Consequently, high dense electron-positron plasma with amaximum intensity above 10e20 W/cm2 is produced. Modulation dynamics of createdpair plasmas is further observed when target foil becomes transparent. It isshown that stable SWs formed directly by two counter-propagating lasers, notonly trap the created electron-positron pairs to their nodes, but also modulateperiodically average energy and phase-space and angular distributions oftrapped particles. However, similar trapping and modulation effects becomeobscure in the opaque regime due to the absence of stable SW field.

High-energy-density electron-positron pair plasma production and its dynamics in the relativistic transparency regime