Graphene/hBN van der Waals heterostructures with metasurfaces for wavelength-reconfigurable infrared sensors

Detection-wavelength reconfigurability is attracting attention in infrared sensor applications, including multicolor imaging, biomedical analysis, and gas sensing. We propose graphene/hexagonal boron nitride (hBN) van der Waals heterostructures with metasurfaces to achieve such reconfigurability. hBN was formed on or in one-dimensional nanograting-based metasurfaces, where it modulates optical absorption by the metasurfaces and enables multiband absorption via interaction between surface plasmon resonance and hyperbolic phonon polaritons. Graphene formed on or in hBN can control the absorption wavelength when a bias voltage is applied and its chemical potential is tuned. These results are expected to contribute to the realization of detection-wavelength-reconfigurable infrared sensors.