Optics and Photonics Society of Iran

: In this paper, we set to report on design and construction of a plasmonic laser made of a metallic photonic crystal slab. Rhodamine 6G solution has been used as a gain medium. The photonic crystal slab consists of gold triangular nano-beads which are arranged in a hexagonal lattice using nano-sphere lithography. A Q-switched Nd:YAG second harmonic laser with 12ns pulsed width and 5Hz pulse repetition rate is used to optically pump the plasmonic laser. Emission spectrum and the spectral width as a function of pumping energy are measured through a UV-Vis spectrometer. Moreover, the physics behind the functional behavior of the structure is investigated through finite-element method. Even though the size of the nano-beads are small, the results show that there is an absorption cross section peak inside the PL spectrum of the gain medium which can excite localized surface plasmon resonances in the nano-beads leading to laser action.