Photonics Research, 2020, 8 (2): 02000175, Published Online: Feb. 10, 2020
Microcrystal modulated exciton-polariton emissions from single ZnO@ZnO:Ga microwire 
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Fig. 1. Synthesis of single ZnO@ZnO:Ga MW. (a) Schematic diagram of the preparation procedure of ZnO MC-decorated pre-synthesized ZnO:Ga MWs. (b) Optical photograph of the as-synthesized individual ZnO@ZnO:Ga MWs, located around the Si substrate. (c) SEM image of the pre-synthesized ZnO:Ga MWs, with perfect quadrilateral cross section displayed in the inset. (d) SEM image of the as-synthesized individual ZnO@ZnO:Ga MWs. (e)–(g) Amplified SEM image of ZnO MCs, deposited on the ZnO:Ga MWs.
Fig. 2. Optically pumped random lasing features from single ZnO MC. (a) SEM image of as-synthesized single ZnO MC. (b) Microscopic images of light emission from optically pumped single ZnO MC, with the excitation power density ranging from 9.0 to 12.0 mW / μm 2 10 mW / μm 2 13.0 mW / μm 2 10.3 mW / μm 2
Fig. 3. Optically pumped lasing features from single ZnO@ZnO:Ga MW. (a) Two distinct Gaussian deconvoluted sub-bands of the PL spectrum from single ZnO@ZnO:Ga MW, with the excitation power density ∼ 7.0 mW / μm 2 9.0 mW / μm 2 9.0 mW / μm 2 22.0 mW / μm 2 9.0 mW / μm 2
Fig. 4. Working principle of optically pumped F–P mode lasing action from single ZnO@ZnO:Ga MW. (a) Comparison of normalized PL spectra from single ZnO MC and single ZnO:Ga MW. (b) Schematic illustration of optically pumped F–P mode microsized laser composed of single ZnO@ZnO:Ga MW. (c) Energy-band alignment toward the homointerface between ZnO MC and ZnO:Ga MW.
Fig. 5. Optical microscopic image of the light emitting from electrically biased single ZnO@ZnO:Ga MW-based heterojunction diode. With an increase in the injection current ranging from 5.5 to 12.0 mA, bright and blue-violet light emission can be observed, with the lighting regions located along the MW.
Fig. 6. Exciton-polariton emission characteristics from electrical-pumping single ZnO@ZnO:Ga MW-based heterojunction diode. (a) I – V
Wangqi Mao, Mingming Jiang, Jiaolong Ji, Peng Wan, Xiangbo Zhou, Caixia Kan. Microcrystal modulated exciton-polariton emissions from single ZnO@ZnO:Ga microwire[J]. Photonics Research, 2020, 8(2): 02000175.
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