Fei long Mao, Hengliang Wang, Zhenghua An V. Conclusions The F-P cavity mode couples strongly with LSR but very weakly with SPs, this is because F-P cavity mode and LSR have the same directional no-ignorable electric component while the electric field of F-P cavity mode and SPs are orthogonal. References: [1] Y. Kurokawa, and H. T. Miyazaki, Physical Review B 75, 13 (2007) [2] H. T. Miyazaki, and Y. Kurokawa, Applied Physics Letters 89, 3 (2006). [3] V. J. Sorger et al., Nano Letters 9, 3489 (2009). Coupling of plasmonic and Fabry-Perot modes in metal/insulator/metal optical cavities Fei long Mao, Hengliang Wang, Zhenghua An Laboratory of Advanced Material ., Fudan Univ., Shanghai, People’s Republic of China Optical cavities attract great research interest due to their great potential in enhancing light-matter interaction and also possible improvements to optoelectronics device performance. We study a Au/GaAs/Au plasmonic cavity with one Au film perforated with cross shaped hole arrays. By using FDTD method, we study the plasmonic and photonic modes and their interactions in this plasmonic cavity. Fabry-Perot (F-P) cavity resonance mode, localized shape resonances (LSRs) and surface plasmon (SPs) are clearly identified. Due to much enhanced multi-order plasmonic modes in this cavity, it provides a novel way to design tunable ultrathin multi-color quantum well infrared photodectors (QWIPs) I. Simulation Structure II. SPs, LSR and F-P coupling The low SPs mode shows nearly none coupling with F-P mode Light impacts normally to the plasmonic cavity with electric y polarized Ⅲ. The eletric distribution of F-P, LSR and SPs The xy plane electric distribution of LSR, Ey and Ez both are important components The identification of Fabry-Perot mode from electirc distribution, Ey is the dominate component Caption: Color contour plot of the reflection against f and 1/S for the Au/GaAs/Au cavity with different parameters, S is the distance between two Au films. The slopes inserting with origin correspond to Fabry-Perot cavity mode. The LSR modeS couple strongly with F-P mode The xy plane electric distribution of SPP, Ez is the dominent component