title: Plasmonic light harvesting for multicolor infrared thermal detection.
abstract: Here we combined experiments and theory to study the optical properties of a plasmonic cavity consisting of a perforated metal film and a flat metal sheet separated by a semiconductor spacer. Three different types of optical modes are clearly identified-the propagating and localized surface plasmons on the perforated metal film and the Fabry-Perot modes inside the cavity. Interactions among them lead to a series of hybridized eigenmodes exhibiting excellent spectral tunability and spatially distinct field distributions, making the system particularly suitable for multicolor infrared light detections. As an example, we design a two-color detector protocol with calculated photon absorption efficiencies enhanced by more than 20 times at both colors, reaching ~42.8% at f1 = 20.0THz (15μm in wavelength) and ~46.2% at f2 = 29.5THz (~10.2μm) for a 1μm total thickness of sandwiched quantum wells.
authors: Institute of Advanced Materials, State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai, China.
authors: Feilong
authors: F
authors: Mao
authors: Jinjin
authors: J
authors: Xie
authors: Shiyi
authors: S
authors: Xiao
authors: Susumu
authors: S
authors: Komiyama
authors: Wei
authors: W
authors: Lu
authors: Lei
authors: L
authors: Zhou
authors: Zhenghua
authors: Z
authors: An