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Proportional electroluminescence (EL) in noble gases is used in two-phasedetectors for dark matter search to record ionization signals in the gas phaseinduced by particle scattering in the liquid phase (S2 signals). In this work,the EL pulse-shapes in a two-phase argon detector have for the first time beenstudied systematically in a wide range of reduced electric field, varying from3 to 9 Td. The pulse-shapes were studied at different readout configurationsand spectral ranges: using cryogenic PMTs and SiPMs, with and without awavelength shifter (WLS), in the VUV and visible range. We observed the fastcomponent and two unusual slow components, with time constants of about 5$\mu$s and 40 $\mu$s. The unusual characteristic property of slow componentswas that their contribution and time constants increased with electric field.

Observation of unusual slow components in electroluminescence signal of two-phase argon detector