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In this report, we demonstrate multi-functional light emitter based on band-edge modes near Γ-point in a two-dimensional honeycomb photonic crystal slab. Different band-edge modes near Γ-point are identified, including the monopole (Γ2), dipole (Γ4,5), and quadrupole (Γ6,7) modes. The monopole and quadrupole modes lasing are observed with high side-mode suppression-ratio of 35 dB and high index sensitivity of 375 nm per refractive index unit, which shows their potential in optical micro-laser and index sensor applications. Over five-fold photoluminescence enhancement with broad band-width of 100 nm from the dipole mode is also observed at room temperature, which shows the advantage of honeycomb lattice structure for designing high brightness light emitting diodes.
Date of Publication: June15, 2011