Terahertz Photonic Devices Employing Graphene-based Hybrid Metasurfaces

Graphene has emerged in recent years as a versatile material for photonic devices operating in the infrared to terahertz (THz) spectral region. In particular, the large tunability of carrier density and the high carrier mobility of graphene allow this two-dimensional material to support tunable THz surface plasmon polaritons with exceedingly high field localization and enhancement as well as relatively long lifetime. The compatibility of graphene with a wide range of materials and various micro- and nano-fabrication processes also makes integrating graphene-based structures with other structures/devices relatively straightforward. In this invited talk, we will present several types of THz photonic devices we developed in recent years, including modulators and detectors, which employ graphene-based hybrid structures (e.g. metasurfaces) to achieve enhanced light-matter interactions and hence improved device performances.