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We observe an anomalously high electric field of terahertz (THz) radiationacting on a two-dimensional electron gas (2DEG) placed beneath a thin goldfilm, which, however, is supposed to be opaque at THz frequencies. We show thatthe anomalously strong penetration of the THz electric field through a veryhigh conductive gold film emerges if two conditions are fulfilledsimultaneously: (i) the film's thickness is less than the skin depth and (ii)the THz electric field is measured beneath the film at distances substantiallysmaller than the radiation wavelength. We demonstrate that under theseconditions the strength of the field acting on a 2DEG is almost the same as itwould be in the absence of the gold film. The effect is detected formacroscopically homogeneous perforation-free gold films illuminated byTHz-laser radiation with a spot smaller than the film area. This eliminates thenear-field of the edge diffraction as a possible cause of the anomalouspenetration. The microscopic origin of the effect remains unexplained in itsdetails, yet. The observed effect can be used for the development of THzdevices based on two-dimensional materials requiring robust highly conductingtop gates placed at less than nanometer distance from the electron gaslocation.

Observation of anomalously strong penetration of terahertz electric field through terahertz-opaque gold films into a GaAs/AlGaAs quantum well