Graphene acoustic plasmon resonator for ultrasensitive infrared spectroscopy
NATURE NANOTECHNOLOGY(2019)
摘要
One of the fundamental hurdles in plasmonics is the trade-off between electromagnetic field confinement and the coupling efficiency with free-space light, a consequence of the large momentum mismatch between the excitation source and plasmonic modes. Acoustic plasmons in graphene, in particular, have an extreme level of field confinement, as well as an extreme momentum mismatch. Here, we show that this fundamental compromise can be overcome and demonstrate a graphene acoustic plasmon resonator with nearly perfect absorption (94%) of incident mid-infrared light. This high efficiency is achieved by utilizing a two-stage coupling scheme: free-space light coupled to conventional graphene plasmons, which then couple to ultraconfined acoustic plasmons. To realize this scheme, we transfer unpatterned large-area graphene onto template-stripped ultraflat metal ribbons. A monolithically integrated optical spacer and a reflector further boost the enhancement. We show that graphene acoustic plasmons allow ultrasensitive measurements of absorption bands and surface phonon modes in ångström-thick protein and SiO 2 layers, respectively. Our acoustic plasmon resonator platform is scalable and can harness the ultimate level of light–matter interactions for potential applications including spectroscopy, sensing, metasurfaces and optoelectronics.
更多查看译文
关键词
Nanophotonics and plasmonics,Nanosensors,Optical properties and devices,Materials Science,general,Nanotechnology,Nanotechnology and Microengineering
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络