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彭隆瀚 台灣大學光電所與電機系 peng@cc.ee.ntu.edu.tw

彭隆瀚 台灣大學光電所與電機系 peng@cc.ee.ntu.edu.tw. 1. Ferroelectric nanostructures for white laser and high speed electronics applications 鐵電相微奈結構與其在雷射與高速晶體管之應用. 5.24.2010 東華大學物理系. 2. 鐵電相微奈結構之製備與應用 - 雷射光能轉換 - 次世代電子技術替代方案. RGB 雷射之色域顯示，優於習知光源技術

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彭隆瀚 台灣大學光電所與電機系 peng@cc.ee.ntu.edu.tw

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  1. 彭隆瀚 台灣大學光電所與電機系 peng@cc.ee.ntu.edu.tw 1 Ferroelectric nanostructures for white laser and high speed electronics applications鐵電相微奈結構與其在雷射與高速晶體管之應用 5.24.2010 東華大學物理系

  2. 2 • 鐵電相微奈結構之製備與應用 -雷射光能轉換 -次世代電子技術替代方案

  3. RGB雷射之色域顯示，優於習知光源技術 (630, 532, 465)nm 為RGB雷射顯示之優選波長，白光雷射之功率比 2 : 1.4 : 1 3 光源與色域

  4. Microvision PicoP 10 Lumens /WVGA 4 LED vs Laser 投影品質比較 • Optoma pk-102 • 10 Lumens/HVGA • NT$14,000/set 資料來源 奧圖碼 資料來源 Microvision

  5. CES 2008 (65”, 73”) 500 nits 電力消耗< 200W 5 雷射在高畫質電視應用 資料來源 三洋電機 雷射投影電視 • 04. 2009. (100”) • 7000 lm 資料來源 三菱電機 雷射電視

  6. 6 產業趨勢: Projector Phone 4.2009. IEEE Spectrum http://www.spectrum. ieee.org/video?id=921 * US: Logic Wireless “Bolt” 01.2009. 技術: 深圳ChinaKing LCoS/LED * Korea: Samsung “Show-W7900” 01.2009. 技術: TI-DLP/LED • US: Microvision “PicoP” 10.2008. 技術: MEMS/Laser亞洲光學組裝 • US: 3M“MPro110”LCoS/LED 08.2008.

  7. 7 資料來源Microvision 習知雷射投影之光源技術 資料來源 松下電器 640/532/445nm

  8. Wavelength Conversion 8 • Conservation of energy and momentum • Birefringent Phase Matching BPM • 缺點:作用光極化(偏振)方向相互垂直 • 轉換效率較低 (beam walk off) • Textbook Example: SHG in KTP (green laser) w+ w = 2w

  9. 9 Issues with BPM-SHG • Beam walk-off, overlap  • Dk (q,l,T) narrow SHG: qo+1.3o qo Giordmaine, PRL 8, 19 (1962) Boyd et al., PR137, A1305 (1965)

  10. 雷射光能轉換 相位匹配 哈佛大學教授Bloembergen PR 127, p.1918 (1962) (1981年諾貝爾物理獎) 2kw + G = k2wG = 2p/L 週期性結構提供晶格動量G (倒戈矢)滿足波長轉換動量守恆 10 Ew E2w lc lc : coherent length 同調長度 適用於無中心對稱之有機、無機塊材與奈米結構

  11. Design of QPM period 11 Period, Λ

  12. 12 Nonlinear Photonic Crystal Engineered structures with spatialcontrast in c(1) or c(2)to control the propagation of light in the material c(1) PC : modification of wave dispersion photonic bandgap and linear optics, dmin~ l/n c(2) quadratic PC: wavelength conversion soliton,quantum entanglement …dmin~l/dn Physics Today May, 1994 LEOS New Letters Aug, 2003

  13. Example of Ferroelectric Switching 13 O O O Li+ion Li Nb * E-field activated domain reversal on LiNbO3 * Eapp> Ec: coercive field * Nonlinear Photonic Crystal Haycock et al, APL 48, 698 (1986)利用電壓(>15kV)形成疇反轉與週期控制 Ec~ 21.5KV/mm “poling”

  14. 14 Submicron-Domain Research • LiNbO3, LiTaO3 (congruent, stoichiometric, doped) • Scanning Force Microscopy (SFM) to write/read • NIMS, Tohoku U./Pioneer (Japan) NCST, ORNL (USA); Tel Aviv U. (Israel) APL85, 452 (2004), CG-LN, Tel Aviv U. Mat. Sci. Eng. B120, 130 (2005), Pioneer/Tohoku MgO:LN Area density ~1.5TBit/inch2 on CG-LT

  15. 15 Strategy for sub-mm domain: AFM Conductive tip with 20 nm curvature Bias voltage V SFM tip 180°-domain parallel to c-axis LiNbO3 5 mm Ps LiNbO3 Metal substrate Polarization inverted by applying a bias voltage Domain inverted by tip scanning on surface

  16. The Kinetics of Domain Inversion 16 Model : Nucleation Control Sidewise Wall Model [1]: (a) Nucleation +Z (b) Tip Propagation Ps (c) Tip Termination (d) Rapid Coalescence (e) Wall Propagation (f) Domain Stabilization [1] G. D. Miller, Ph.D. dissertation, Stanford University, 1998

  17. High Voltage Poling Method 17 Poling waveform model : Nucleation Control Sidewise Wall Model Stanford U. J. Opt. Soc. Am. B, 12, 2102 (1995) Nucleation Tip / Wall Propagation Stabilization Stabilization

  18. 二維非線性光子晶體 18 (a) (a) (b) (b) (d) (c) 二次諧波產生 w + w →2w

  19. Optics Measurement 19 Two-dimensional PPLT λp=929.5nm G1,0 G1,2 K SHG G1,1 λp=923.5nm K SHG K12 G1,1 G1,-1 K11 G1,0 Kω Kω K10 K SHG G1,-1 λp=908.2nm G1,-2 G1,2 G1,-2

  20. Optical Parametric Oscillation 20 光學參量放大‥電晶體 Idler Pump Leftover Pump DFG Signal Small Signal Amplified Signal Resonant Signal Momentum Conservation Kp=Ks+Ki+Kg Energy Conservation wp=ws+wi 光學參量振盪: 無中生有 20

  21. 21 L=10mm PPLT Self-doubling OPO Blue Laser L=15mm PPLT OPO Red Laser 綠-紅藍雷射光能轉換技術 光學參量上下轉換

  22. Design of Self-Doubling OPO 22 Effective Nonlinear Coefficient is less for 2nd QPM-SHG!! LOPO=2LSHG 22

  23. Experiment Set-Up 23 532nm Pump Laser 4KHz 17.2ns Power Meter Filter 28mm Cavity OC IC Blue Light Oven R.O.C 5 cm R.O.C 5 cm ℃

  24. 24 Self Self - - Doubling Doubling OPO cascading Red OPO OPO cascading Red OPO White Light Laser White Light Laser  Self-doubling Blue OPO  Red OPO L=20mm, 100mW- White Light Laser Head 進行中之研究 • 白光雷射技術 (應用) • 阿秒雷射波合成 (基礎) 100mW PPLT 白光雷射晶片

  25. 25 Multi-harmonics generation 20% conversion efficiency

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