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设计了一种缺陷模迁移光子晶体微腔全光开关. 两条二维三角晶格空气孔光子晶体波导由一个光子晶体微腔连接, 在微腔的点缺陷中填充掺有少量偶氮聚合物的苯乙炔类液晶. 通过调节控制光的偏振态, 使偶氮聚合物发生顺-反异构化反应, 带动液晶分子重新取向, 从而改变光子晶体微腔的谐振波长, 进而实现光的通过与截止. 运用时域有限差分法和平面波展开法分析 了二维光控液晶光子晶体微腔全光开关的光学特性. 数值计算结果表明: 对于1.55 μ通信波段通过外界偏振光控制所填充的向列相液晶 的折射率可以实现对光波的导通与截止. 分析结果显示, 此开关具有阈值低, 消光比较大, 体积小等优点.
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关键词:
- 二维光子晶体微腔 /
- 波导 /
- 时域有限差分(FDTD) /
- 液晶
A novel photonic crystal (PC) all-optical switch based on the shift of defect mode is demonstrated. Two photonic crystal waveguides are connected by a photonic crystal cavity. The point defect of the photonic crystal cavity is filled with phenylacetylene liquid cyrstals intermingled with azobenzene. The output of the optical switch is controlled by adjusting the rotation angle of the liquid crystals' orientation vector. And the optical switch is numerically investigated by using the finite difference time domain (FDTD) method and plane wave expansion method. Numerical simulation shows that the optical switch based on the PC cavity can be changed by adjusting the applied linearly polarized light. Results show that the switch has low threshold power density, great extinction ratio, and small size.-
Keywords:
- two-dimensional photonic crystal cavity /
- waveguide /
- finite difference time domain (FDTD) method /
- liquid crystals
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[2] John S 1987 Phys. Rev. Lett. 58 2486
[3] Chen Y L, Lien W C 2005 Opt. Commun. 256 114
[4] Leonard S W, Mondia J P, Driel H M, Toader O, John S 2000 Phys. Rev. B 61 2389
[5] Hiroyuki T, Katsumi Y 2003 Phys. Rev. E 67 056607
[6] Hiroyuki T, Katsumi Y 2003 Phys. Rev. B 67 073106
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[8] Scalora M, Dowling J P, Bowden C M, Bloemer M J 1994 Phys. Rev. Lett. 73 1368
[9] Gong Q H, Hu X Y 2006 Acta Scientiarum Naturalium Universitatis Pekinensis 42 1
[10] Tan C H, Huang X G 2010 Acta. Optica. Sinica 30 2714(in Chinese) [谭春华, 黄旭光 2010 光学学报 30 2714]
[11] Locatelli A, Modotto D, Paloschi D, Angelis C D 2004 Opt Commun. 237 97
[12] Hu X Y, Gong Q H, Liu Y H, Cheng B Y, Zhang D Z 2005 Appl. Phys. Lett. 87 23111
[13] Fei Q, Zi M M, Zhi Y L 2012 J. Opt. Soc. Am. B 29 2314
[14] Tanabe T, Nishiguchi K, Shinya A, Eiichi K, Hiroshi I, Masaya N, Koji Y, Tai T, Toshifumi W, Hiroshi F, Hiroyuki S, Seiichi I 2007 Appl. Phys. Lett. 90 3 031115
[15] Wang C H, Zhao G H, Chang S J 2012 Acta Phys. Sin. 61 157805 (in Chinese) [王昌辉, 赵国华, 常胜江 2012 61 157805]
[16] Kersten S, Roman K 2010 Opt. Lett. 18 7307
[17] Tada T, Poborchii V V, Kanayama T. 2002 Microelectronic Engineering 63 259
[18] Schadt M, Schmitt K, Kozinkov V, Chigrinov V 1992 Japn. J. Appl. Phys. 31 2155
[19] Tan C H, Huang X G, Yin J L 2006 Chinese Journal of Liquid Crystals and Display 21 291 (in Chinese) [谭春华, 黄旭光, 殷建玲 2006 液晶与显示 21 291]
[20] Liang Z C, Ming H, Wang Pei, Zhang J Y, Long Y Z, Xia Y, Xie J P, Zhang Q J, 2001 Acta Phys. Sin. 50 2482 (in Chinese) [梁忠诚, 明海, 王沛, 章江英, 龙云泽, 夏勇, 谢建平, 张其锦 2001 50 2482]
[21] Tsutsumi O, Ikeda T 2002 Current Opinion in Solid State & Materials Science 6 563
[22] Wang C Q, Zhu X L 1994 The FDTD Method in Electromagnetic Field (Beijing: Peking University Press) p18 (in Chinese) [王长庆, 祝西里 1994 电磁场计算中的时域有限差分法 (北京: 北京大学出版社) 第18页]
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[1] Yablonovitch E 1987 Phys. Rev. Lett. 58 2059
[2] John S 1987 Phys. Rev. Lett. 58 2486
[3] Chen Y L, Lien W C 2005 Opt. Commun. 256 114
[4] Leonard S W, Mondia J P, Driel H M, Toader O, John S 2000 Phys. Rev. B 61 2389
[5] Hiroyuki T, Katsumi Y 2003 Phys. Rev. E 67 056607
[6] Hiroyuki T, Katsumi Y 2003 Phys. Rev. B 67 073106
[7] Tan C H, Huang X G 2008 Journal of Applied Optics 29 3 452 (in Chinese) [谭春华, 黄旭光 2008 应用光学 29 3 452]
[8] Scalora M, Dowling J P, Bowden C M, Bloemer M J 1994 Phys. Rev. Lett. 73 1368
[9] Gong Q H, Hu X Y 2006 Acta Scientiarum Naturalium Universitatis Pekinensis 42 1
[10] Tan C H, Huang X G 2010 Acta. Optica. Sinica 30 2714(in Chinese) [谭春华, 黄旭光 2010 光学学报 30 2714]
[11] Locatelli A, Modotto D, Paloschi D, Angelis C D 2004 Opt Commun. 237 97
[12] Hu X Y, Gong Q H, Liu Y H, Cheng B Y, Zhang D Z 2005 Appl. Phys. Lett. 87 23111
[13] Fei Q, Zi M M, Zhi Y L 2012 J. Opt. Soc. Am. B 29 2314
[14] Tanabe T, Nishiguchi K, Shinya A, Eiichi K, Hiroshi I, Masaya N, Koji Y, Tai T, Toshifumi W, Hiroshi F, Hiroyuki S, Seiichi I 2007 Appl. Phys. Lett. 90 3 031115
[15] Wang C H, Zhao G H, Chang S J 2012 Acta Phys. Sin. 61 157805 (in Chinese) [王昌辉, 赵国华, 常胜江 2012 61 157805]
[16] Kersten S, Roman K 2010 Opt. Lett. 18 7307
[17] Tada T, Poborchii V V, Kanayama T. 2002 Microelectronic Engineering 63 259
[18] Schadt M, Schmitt K, Kozinkov V, Chigrinov V 1992 Japn. J. Appl. Phys. 31 2155
[19] Tan C H, Huang X G, Yin J L 2006 Chinese Journal of Liquid Crystals and Display 21 291 (in Chinese) [谭春华, 黄旭光, 殷建玲 2006 液晶与显示 21 291]
[20] Liang Z C, Ming H, Wang Pei, Zhang J Y, Long Y Z, Xia Y, Xie J P, Zhang Q J, 2001 Acta Phys. Sin. 50 2482 (in Chinese) [梁忠诚, 明海, 王沛, 章江英, 龙云泽, 夏勇, 谢建平, 张其锦 2001 50 2482]
[21] Tsutsumi O, Ikeda T 2002 Current Opinion in Solid State & Materials Science 6 563
[22] Wang C Q, Zhu X L 1994 The FDTD Method in Electromagnetic Field (Beijing: Peking University Press) p18 (in Chinese) [王长庆, 祝西里 1994 电磁场计算中的时域有限差分法 (北京: 北京大学出版社) 第18页]
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