Multi-Functional Light Emitter Based on Band-Edge Modes Near Gamma-Point in Honeycomb Photonic Crystal

Abstract

In this report, we demonstrate multi-functional light emitter based on band-edge modes near Gamma-point in a two-dimensional honeycomb photonic crystal slab. Different band-edge modes near Gamma-point are identified, including the monopole (Gamma(2)), dipole (Gamma(4,5)) and quadrupole (Gamma(6,7)) 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.