基于磁光子晶体的太赫兹滤波器和光开关
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摘要
设计了基于石榴石型铁氧体磁性材料的光子晶体滤波器和光开关。利用平面波展开(PWE)法,分析了特定半径下光子晶体的能带结构,利用时域有限差分(FDTD)法分析了磁场改变时磁性材料耦合频率的变化。结果表明,该器件在不加磁场时具有优良的选频滤波功能,各目标光信号的透射率均达90%以上,且信道串扰小;加磁场后,耦合腔的耦合频率改变,器件处于关断状态。该器件的关断最大稳定时间达26.7ps,最大透射率仅为8%,关断效果明显,具有良好的开关特性。
The photonic crystal filter and optical switch are designed based on the garnet-type ferrite magnetic material.The band structure of the photonic crystal with a specific radius is analyzed by the plane wave expansion method(PWM),and the change of coupling frequency of magnetic materials with the magnetic field is analyzed by the finite-difference time-domain(FDTD)method.The results show that,when the magnetic field is not added,this device has excellent frequency selection and filtering functions,the transmissivity of each target light signal is above 90% and the channel crosstalk is small.After the addition of the magnetic field,the coupling frequency of the coupling cavity changes and the device is in a closed state.The maximum stable closing time of this device is 26.4 ps and the maximum transmissivity is only 8%,which indicates that the cut-off effect is obvious and it possesses a good switching characteristic.
The photonic crystal filter and optical switch are designed based on the garnet-type ferrite magnetic material.The band structure of the photonic crystal with a specific radius is analyzed by the plane wave expansion method(PWM),and the change of coupling frequency of magnetic materials with the magnetic field is analyzed by the finite-difference time-domain(FDTD)method.The results show that,when the magnetic field is not added,this device has excellent frequency selection and filtering functions,the transmissivity of each target light signal is above 90% and the channel crosstalk is small.After the addition of the magnetic field,the coupling frequency of the coupling cavity changes and the device is in a closed state.The maximum stable closing time of this device is 26.4 ps and the maximum transmissivity is only 8%,which indicates that the cut-off effect is obvious and it possesses a good switching characteristic.
引文
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[18]Guo Z,Fan F,Bai J J,et al.Magnetically tunable magnetic photonic crystal for terahertz switch and filter[J].Acta Physica Sinica,2011,60(7):074218.郭展,范飞,白晋军,等.基于磁光子晶体的磁控可调谐太赫兹滤波器和开关[J].物理学报,2011,60(7):074218.
[19]Manzanares-Martinez J,Castro-Garay P.Modeling the tuning of lasing in liquid crystal based one-dimensional photonic crystals using the finite difference time-domain method[J].Journal of Electromagnetic Waves and Application,2010,24(14/15):1867-1875.
[2]Yu H X,Du C M,Liang G D.Tunable wavelength filter based on photonic crystal with complex periodical structure[J].Laser&Optoelectronics Progress,2009,46(3):44-48.于海霞,杜春梅,梁广东.复周期结构光子晶体波长可调谐滤波器的研究[J].激光与光电子学进展,2009,46(3):44-48.
[3]Li L,Liu G Q,Chen Y H.An optical switch based on coupled heterostructure photonic-crystal waveguides[J].Acta Optica Sinica,2013,33(1):0123002.黎磊,刘桂强,陈元浩.光子晶体异质结耦合波导光开关[J].光学学报,2013,33(1):0123002.
[4]Yablonovitch E.Inhibited spontaneous emission in solid-state physics and electronics[J].Physics Review Letters,1987,58(20):2059-2062.
[5]Khan M M.Nano structure based power splitter design by using 2D photonic crystals[J].Journal of Modern Science and Technology,2013,1(1):176-187.
[6]LüJ T,Wang C M,Zhu C H,et al.Dual-core photonic crystal fiber transverse-stress sensor based on surface plasmon resonance[J].Acta Optica Sinica,2017,37(8):0828002.吕健滔,王春明,朱晟昦,等.基于表面等离子体共振的双芯光子晶体光纤横向应力传感器[J].光学学报,2017,37(8):0828002.
[7]Lin M,Qiu W B,Xi X,et al.Polarization selective power splitters for TE and TM waves based on twodimensional photonic crystals[J].Acta Optica Sinica,2016,36(12):1223001.林密,邱文标,郗翔,等.基于二维光子晶体的偏振选择TE/TM波功率分配器[J].光学学报,2016,36(12):1223001.
[8]Su K,Wang Z M,Liu J J.Three waveguides directional coupler based on two dimensional square lattice photonic crystal[J].Acta Optica Sinica,2016,36(3):0323002.苏康,王梓名,刘建军.二维正方晶格光子晶体三光波导方向耦合器[J].光学学报,2016,36(3):0323002.
[9]Su J,Chen H M.Terahertz wave modulator based on liquid-crystal-filled photonic crystal[J].Acta Optica Sinica,2010,30(9):2710-2713.苏坚,陈鹤鸣.基于液晶光子晶体的太赫兹波调制器[J].光学学报,2010,30(9):2710-2713.
[10]Ni Y,Ji K,Wang J L,et al.Four-wavelength THz filter based on photonic crystal ring resonator[J].High Power Laser and Particle Beams,2016,28(10):103101.倪媛,季珂,汪静丽,等.光子晶体环形腔的四波长THz滤波器[J].强激光与粒子束,2016,28(10):103101.
[11]Zhang H W,Li J,Su H,et al.Development and application of ferrite materials for low temperature co-fired ceramic technology[J].Chinese Physics B,2013,22(11):12-32.
[12]Teng C C,Zhou W,Zhuang Y Y,et al.Low loss and narrow-band THz filter based on magnetic photonic crystals[J].Acta Physica Sinica,2016,65(2):024210.滕晨晨,周雯,庄煜阳,等.基于磁光子晶体的低损耗窄带THz滤波器[J].物理学报,2016,65(2):024210.
[13]Gan Y Y,Li P L,Zhang Y F,et al.THz routing switch and beam splitter based on magnetic photonic crystals[J].Study on Optical Communications,2017,199(1):44-46.甘雨莹,李培丽,张元方.基于磁光子晶体的太赫兹选路开关和分束器[J].光通信研究,2017,199(1):44-46.
[14]Baboly M G,Soliman Y,Su M F,et al.Enhanced plane wave expansion analysis for the band structure of bulk modes in two-dimensional high-contrast solidsolid phononic crystals[J].Photonics and NanostructuresFundamentals and Applications,2014,12(5):487-492.
[15]Kee C S,Kim J E,Park H Y,et al.Two-dimensional tunable magnetic photonic crystals[J].Physical Review B,2000,61:15523.
[16]Sodha M S,Srivastava N C.Microwave propagation in ferrimagnetics[M].Boston:Springer,1981:52-55.
[17]Bi H X,Zhou Y S,Zhao L M,et al.Magnetron photonic switching circuit in photonic crystal[J].Acta Physica Sinica,2008,57(9):5718-5721.毕海星,周云松,赵丽明,等.光子晶体中的磁控光子开关线路[J].物理学报,2008,57(9):5718-5721.
[18]Guo Z,Fan F,Bai J J,et al.Magnetically tunable magnetic photonic crystal for terahertz switch and filter[J].Acta Physica Sinica,2011,60(7):074218.郭展,范飞,白晋军,等.基于磁光子晶体的磁控可调谐太赫兹滤波器和开关[J].物理学报,2011,60(7):074218.
[19]Manzanares-Martinez J,Castro-Garay P.Modeling the tuning of lasing in liquid crystal based one-dimensional photonic crystals using the finite difference time-domain method[J].Journal of Electromagnetic Waves and Application,2010,24(14/15):1867-1875.