2021/11/10 by Muhammad Waqas Shabbir, Shabbir, Muhammad Waqas, Michael N. Leuenberger +1
Engineering · Materials Science · #Chemical and Physical Properties of Materials #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Photonic and Optical Devices #Plasmonic and Surface Plasmon Research #Thermal Radiation and Cooling Technologies #Transition Metal Oxide Nanomaterials
paper · pdf · doi:10.48550/arxiv.2111.05982
openalex publication_date 2021/11/10 · openalex created_date 2023/03/20 · openalex updated_date 2026/07/28
We present a proof of concept for a spectrally selective near-infrared (NIR) and short-wavelength infrared (SWIR) photodetector based on nanopatterned multilayer graphene intercalated with FeCl3 (NPMLG-FeCl3), enabling large modulation p-doping of graphene. The localized surface plasmons (LSPs) on the graphene sheets in NPMLG-FeCl3 allow for electrostatic tuning of the photodetection in the NIR and SWIR regimes from λ=1.3 μm to 3 μm, which is out of range for nanopatterned monolayer graphene (NPG). Most importantly, the LSPs along with an optical cavity increase the absorbance from about N× 2.6% for N-layer graphene-FeCl3 (without patterning) to nearly 100% for NPMLG-FeCl3, where the strong absorbance occurs locally inside the graphene sheets only. Our NIR and SWIR detection scheme relies on the photo-thermoelectric effect induced by asymmetric patterning of the multi-layer graphene (MLG) sheets. The LSPs on the nanopatterned side create hot carriers that give rise to Seebeck photodetection at room temperature achieving a responsivity of R=6.15× 103 V/W, a detectivity of D^*=2.3× 109 Jones, and an ultrafast response time of the order of 100 ns. Our theoretical results pave the way to graphene-based photodetection, optical IR communication, IR color displays, and IR spectroscopy in the NIR, SWIR, mid-wavelength infrared (MWIR), and long-wavelength infrared (LWIR) regimes.