Surface Plasmon Hybridization of Whispering Gallery Mode Microdisk LaserPresentation Transcript
Surface Plasmon Hybridization of Whispering Gallery Mode Microdisk Laser Oka Kurniawan Iftikhar Ahmed Er Ping Li Photonics Global 14th to 16th December 2010 Singapore
Plasmonics promises both high speed and miniaturization 2 NanoPlasmonics (A*STAR-SERC)
Research on Plasmonics source is essential 3 kx light cone = c k w k View slide
Previous works have shown progress though having low intensity 4 Akimov, A. V., A. Mukherjee, C. L. Yu, D. E. Chang, A. S. Zibrov, P. R. Hemmer, H. Park, and M. D. Lukin. “Generation of single optical plasmons in metallic nanowires coupled to quantum dots.” Nature 450, no. 7168 (November 2007): 402-406. KollerD.M. “Organic plasmon-emitting diode.” Nat Photon 2, no. 11 (November 2008): 684-687. View slide
Metal-insulator-metal structure can excite surface plasmon and coupled directly to waveguide 5 Walters, R. J., R. V. A. van Loon, I. Brunets, J. Schmitz, and A. Polman. “A silicon-based electrical source of surface plasmonpolaritons.” Nat Mater 9, no. 1 (January 2010): 21-25.
We use microdisk laser cavity structure to obtain high intensity output 6 metal Radius = 1 µm Layer thicknesses = 120 nm semiconductor metal MSM source MIM waveguide MIM circuits
Finite-difference time domain method with realistic solid-state model and Lorentz-Drude model is used for simulation 7 Multi-electron multi-level model for modeling electron dynamic in semiconductor. The model can model stimulated emission in laser.
Conventional microdisk shows whispering gallery mode 8 Total electric field at the centre plane of the microdisk Electric field peak intensity at 1.47 µm.
Attaching metal layers hybridize the whispering gallery mode with surface plasmonpolariton mode 9 Total electric field at middle plane of the plasmonicmicrodisk. Comparison of whispering gallery mode and surface plasmonpolariton mode. Electric field enhancement is about 20,000 times at 1.47 µm.
We can couple the plasmonic source to an MIM waveguide with high efficiency 10 Metal Metal Semiconductor Insulator Metal Metal Gap = 20 nm Side view
We observed the surface plasmonpolariton wave traveling along the waveguide and the coupling efficiency is about 60% 11 Normalized electric field at the middle of the plane. The intensity at the waveguide is 60% of the microdisk.