Waveguide-integrated mid-infrared photodetection using graphene on a scalable chalcogenide glass platform
Abstract
The development of compact and fieldable mid-infrared (mid-IR) spectroscopy devices represents a critical challenge for distributed sensing with applications from gas leak detection to environmental monitoring. Recent work has focused on mid-IR photonic integrated circuit (PIC) sensing platforms and waveguide-integrated mid-IR light sources and detectors based on semiconductors such as PbTe, black phosphorus and tellurene. However, material bandgaps and reliance on SiO2 substrates limit operation to wavelengths λ ≲ 4 μm. Here we overcome these challenges with a chalcogenide glass-on-CaF2 PIC architecture incorporating split-gate photothermoelectric graphene photodetectors. Our design extends operation to λ = 5.2 μm with a Johnson noise-limited noise-equivalent power of 1.1 nW/Hz1/2, no fall-off in photoresponse up to f = 1 MHz, and a predicted 3-dB bandwidth of f3dB > 1 GHz. This mid-IR PIC platform readily extends to longer wavelengths and opens the door to applications from distributed gas sensing and portable dual comb spectroscopy to weather-resilient free space optical communications.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 07, 2022
- Source ID
- 10.1038/s41467-022-31607-7
Entities
People
- A-Y Lu
- Dirk Englund
- Hongtao Lin
- Jing Kong
- Jordan Goldstein
- Juejun Hu
- Kathleen A. Richardson
- Marek Hempel
- Skylar Deckoff-jones
- Tomás Palacios
Organizations
- Air Force Office of Scientific Research
- Army Research Office
- National Science Foundation