Graphene Plasmonic Fractal Metamaterials for Broadband Photodetectors
arXiv:2005.06567 · doi:10.1038/s41598-020-63099-0
Abstract
Metamaterials have recently established a new paradigm for enhanced light absorption in state-of-the-art photodetectors. Here, we demonstrate broadband, highly efficient, polarization-insensitive, and gate-tunable photodetection at room temperature in a novel metadevice based on gold/graphene Sierpinski carpet plasmonic fractals. We observed an unprecedented internal quantum efficiency up to 100% from the near-infrared to the visible range with an upper bound of optical detectivity of Jones and a gain up to , which is a fingerprint of multiple hot carriers photogenerated in graphene. Also, we show a 100-fold enhanced photodetection due to highly focused (up to a record factor of for graphene) electromagnetic fields induced by electrically tunable multimodal plasmons, spatially localized in self-similar fashion on the metasurface. Our findings give direct insight into the physical processes governing graphene plasmonic fractal metamaterials. The proposed structure represents a promising route for the realization of a broadband, compact, and active platform for future optoelectronic devices including multiband bio/chemical and light sensors.
arXiv comment10 pages, 6 figures
References in corpus (19)
- Graphene Photonics and Optoelectronics
- Ultrafast graphene photodetector
- Graphene photodetectors for high-speed optical communications
- Hot Carrier-Assisted Intrinsic Photoresponse in Graphene
- Graphene field effect transistors as room-temperature Terahertz detectors
- Switching teraherz waves with gate-controlled active graphene metamaterials
- Strong Plasmonic Enhancement of Photovoltage in Graphene
- Photo-excitation Cascade and Multiple Carrier Generation in Graphene
- Picosecond photoresponse in van der Waals heterostructures
- Photoconductivity of biased graphene
- Photocurrent in graphene harnessed by tunable intrinsic plasmons
- Generation of photovoltage in graphene on a femtosecond time scale through efficient carrier heating
- Design and characterization of electronic fractals
- Enhanced light-matter interaction in graphene-covered gold nanovoid arrays
- Photo-thermoelectric and photoelectric contributions to light detection in metal-graphene-metal photodetectors
- Ultra-compact graphene plasmonic photodetector with the bandwidth over 110GHz
- Giant nonlinearity of carbon nanotubes in a photonic metamaterial
- Transport and optical properties of an electron gas in a Sierpinski carpet
- Multiband Plasmonic Sierpinski Carpet Fractal Antennas