UCLA researchers in the Department of Electrical Engineering have developed a high-responsivity photodetector that utilizes metallo-graphene nanocomposites for superior detection of infrared wavelengths.
Infrared photodetectors are key tools used in multiple applications ranging from medical thermography (detecting irregular blood flow) to building inspections (determining efficiency of heat insulation). Continuous improvements are being made to device detection bandwidths, sensitivity, and responsivity. Currently, graphene is becoming an appealing candidate for the development of infrared photodetectors due to its low-cost nature and ability to generate photocarriers across a broad spectral range. However, their use has been limited by tradeoffs among responsivity, operation speed, and broadband.
UCLA researchers have developed a novel photodetection system using gold-patched graphene nanoribbons. This system, unlike previous graphene photodetectors, does not utilize quantum dots and defect states, effectively bypassing limitations on bandwidth and responsivity, increasing response time by seven orders of magnitude and bandwidths by one order of magnitude. This novel photodetector is capable of ultrabroad operation bandwidth from the visible (800nm wavelength) to infrared (20μm wavelength) while maintaining a high responsivity level (0.6-8 A/W). In addition, the specific design of the gold-patched graphene nanoribbons allows for ultrafast photodetection.
|European Patent Office||Published Application||WO 2018/223068||12/06/2018||2017-786|
Additional Patent Pending
infrared, photodetector, graphene, radiation, thermal imaging, hyperspectral imaging