Generation of millimeter radiation due to electric-field-induced electron-transit-time resonance in indium phosphide

The stimulated millimeter radiation from n-type indium phosphide was observ ed at T = 4.2 K in a strong electric field. The generation is due to the ap pearance of negative differential conductivity near the electron-transit-ti me resonance and electron bundling in momentum space in a strong electric f ield under conditions of low-temperature scattering from optical phonons. T he dependence of the radiation frequency and intensity on the electric fiel d was experimentally measured and the radiation spectrum is presented. The experimental data satisfactorily agree with the results of numerical simula tions obtained previously by the Monte Carlo method. (C) 2001 MAIK "Nauka/ Interperiodica".