Ultrafast Electrically Tunable Polaritonic Metasurfaces

Electrically tunable mid-infrared metasurfaces with nanosecond response time and broad tuning range are reported. Electrical tuning is achieved by employing strong polaritonic coupling of electromagnetic modes in metallic nanoresonators with voltage-tunable inter-subband transitions in semiconductor heterostructures, tailored for a giant quantum-confi ned Stark effect.Experimentally, a 220-nm-…