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Speaker: Kuok-Pan Sou Advisor: Ken- Yuh Hsu Chun-Yen Chang

Lasing Action of Core-Shell InGaN / GaN MQWs on GaN Nanorod Arranged in Photonic Quasicrystal Arrays. Speaker: Kuok-Pan Sou Advisor: Ken- Yuh Hsu Chun-Yen Chang. Introduction Motivation Experiment Fabrication Result and Discussion Crystalline Measurement Optical Measurement

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Speaker: Kuok-Pan Sou Advisor: Ken- Yuh Hsu Chun-Yen Chang

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  1. Lasing Action of Core-Shell InGaN/GaN MQWs on GaNNanorod Arranged in Photonic Quasicrystal Arrays Speaker: Kuok-Pan Sou Advisor: Ken-Yuh Hsu Chun-Yen Chang

  2. Introduction • Motivation • Experiment • Fabrication • Result and Discussion • Crystalline Measurement • Optical Measurement • Conclusion Outline

  3. Introduction • Motivation • Experiment • Fabrication • Result and Discussion • Crystalline Measurement • Optical Measurement • Conclusion Outline

  4. Introduction GaN-base Laser

  5. Introduction • Motivation • Experiment • Fabrication • Crystalline Measurement • Optical Measurement • Result and Discussion • Conclusion Outline

  6. Low Dimensional Structure Motivation Quantum Dot Quantum Wire Quantum Well Super Lattice PIC PIC PIC Enhance Efficiency Low Threshold Quantum Confine Effect

  7. How to fabricated GaN array Motivation Bottom up Top down

  8. Introduction • Motivation • Experiment • Fabrication….. • Result and Discussion • Crystalline Measurement • Optical Measurement • Conclusion Outline

  9. Dry Etching GaN Regrowth Nanoimprint Lithography Bulk c-GaN Fabrication MQW: InGaN/GaN × 6 pairs

  10. Introduction • Motivation • Experiment • Fabrication….. • Result and Discussion • Crystalline Measurement • Optical Measurement • Conclusion Outline

  11. Defect Reduction • Defect reduced by Nano-imprint lithography

  12. 12-fold symmetryphotonic quasi-crystal Defect Reduction & The Enlarged MQWs (Gain Material) • Dislocation density: One order↓ • The enlarged active area by the factor of 5

  13. Introduction • Motivation • Experiment • Fabrication….. • Result and Discussion • Crystalline Measurement • Optical Measurement • Conclusion Outline

  14. uPL Measurement Q~1155 Radius~27um Spotsize~ 2290um^2

  15. (a) (c) 369 nm (b) CL Mapping (e) 440 nm (d) 420 nm (f) 460 nm 500 480 460 440 420 (h) 500 nm (i) 520 nm (g) 480 nm • Red shift from bottom to middle portion of nanorods • Gradient Indium content distribution

  16. Coupling Efficiency of Spontaneous Emission β=xx

  17. ….

  18. Characteristic Temperature Ith(T)=I0 Exp(T/T0) GaNVCSELT0=180~220K

  19. Introduction • Motivation • Experiment • Fabrication • Result and Discussion • Crystalline Measurement • Optical Measurement • Conclusion Outline

  20. Good Job • Thank YOU !! Kidding Day

  21. No Kidding • Be Fun !! Q&A

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