太赫兹正六边形光子晶体光纤的液体传感（英文）
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摘要
设计了一种分别填充水、酒精和苯炔等边三角形空气孔纤芯、包层空气孔排列为正六边形结构、以环烯烃共聚物作为基底材料的光子晶体光纤,利用有限元法模拟了0. 3～1. 5 THz频带内的液体传感特性。结果表明,设计的光子晶体光纤的灵敏度系数很高,当纤芯空气孔直径d_1=2. 4μm、包层空气填充比为0. 3时,苯炔在频率0. 3 THz的相对灵敏性系数最高为37. 63%,在1. 5 THz,限制损耗的数量级可以降至10-7。
A photonic crystal fiber with the cladding of circular air holes in hexagonal lattice structure and the core of circular air holes in equilateral triangle lattice structure based on cyclic-olefin copolymer is proposed,the liquid sensing characteristics of the PCF over 0. 3-1. 5 THz bands are investigated by finite element method. The proposed PCF demonstrates an ultrahigh sensitivity coefficient of 37. 63% at 0. 3 THz,and the confinement loss is low as the order 10~(-7) at frequency of 1. 5 THz. The results offer reference for designing novel liquid sensors based on PCF at terahertz band.
A photonic crystal fiber with the cladding of circular air holes in hexagonal lattice structure and the core of circular air holes in equilateral triangle lattice structure based on cyclic-olefin copolymer is proposed,the liquid sensing characteristics of the PCF over 0. 3-1. 5 THz bands are investigated by finite element method. The proposed PCF demonstrates an ultrahigh sensitivity coefficient of 37. 63% at 0. 3 THz,and the confinement loss is low as the order 10~(-7) at frequency of 1. 5 THz. The results offer reference for designing novel liquid sensors based on PCF at terahertz band.
引文
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[2]FERGUSON B,ZHANG X C.Materials for terahertz science and technology[J].Nat.Mater.,2002,1(1):26-33.
[3]FU M X,ZHANG Y.Progress of terahertz devices based on graphene[J].J.Electron.Sci.Technol.,2013,11(4):352-359.
[4]FEDERICI J F,SCHULKIN B,HUANG F,et al..THz imaging and sensing for security applications-explosives,weapons and drugs[J].Semicond.Sci.Technol.,2005,20(7):S266-S280.
[5]TAJIMA K,ZHOU J.Recent progress of photonic crystal fibers[J].Acta Opt.Sinica,2003,23(S1):29-30.
[6]WADSWORTH W J,KNIGHT J C,REEVES W H,et al..Photonic crystal fibers[J].Acta Opt.Sinica,2003,23(S1):11-12.
[7]SEN S,CHOWDHURY S,AHMED A,et al..Design of a porous cored hexagonal photonic crystal fiber based optical sensor with high relative sensitivity for lower operating wavelength[J].Photonic Sens.,2017,7(1):55-65.
[8]杜志泉,倪锋,肖发新.光纤传感技术的发展与应用[J].光电技术应用,2014,29(6):7-12.DU Z Q,NI F,XIAO F X.Development and application of optical fiber sensing technology[J].Electro-Optic Technol.Appl.,2014,29(6):7-12.(in Chinese)
[9]ISLAM R,HABIB M S,HASANUZZAMAN G K M,et al..A novel low-loss diamond-core porous fiber for polarization maintaining terahertz transmission[J].IEEE Photonics Technol.Lett.,2016,28(14):1537-1540.
[10]KAMIKAWACHI R C,ABE I,PATERNO A S,et al..Determination of thermo-optic coefficient in liquids with fiber Bragg grating refractometer[J].Opt.Commun.,2008,281(4):621-625.
[11]MORSHED M,ASADUZZAMAN S,ARIF M F H,et al..Proposal of simple gas sensor based on micro structure optical fiber[C].International Conference on Electrical Engineering and Information Communication Technology,Dhaka,2015:1-5.
[12]HASAN M R,ISLAM M A,RIFAT A A.A single mode porous-core square lattice photonic crystal fiber for THz wave propagation[J].J.Eur.Opt.Soc.-Rapid Publ.,2016,12(1):15.