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

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3 Author(s)
Po-Tsung Lee ; Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Tsan-Wen Lu ; Kuan-Un Sio

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.

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Lightwave Technology, Journal of  (Volume:29 ,  Issue: 12 )