Relativistic-induced opacity of electron–positron plasmas

The interaction of intense electromagnetic waves with electron-positron (e-e+) plasmas is studied by particle-in-cell simulations and theoretical analysis. It found that an initial underdense e+plasma can become opaque under the irradiation a relativistically laser pulse. strong ponderomotive force relativistic pulse small mass density e-e+ plasma combine to induce efficient pile-up electrons positrons at front Therefore, local increases dramatically finally becomes opaque. This relativistic-induced opacity effect opposite well-known transparency effect, in which overdense electron-ion transparent Further, significant red shift reflected lights as well generation energetic are investigated plasmas. peculiar phenomenon e-e+plasmas, may be encountered high-energy astrophysical phenomena or interactions lasers matters laboratories.