太赫兹波段双频带手征性超表面的设计
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摘要
提出一种具有巨旋光性和负折射特性的双频带手征性超表面结构,该手征性超表面由中间介质层和双层共轭卍字形周期排列而成;通过研究面电流密度分布,解释了巨旋光性和负折射率产生的原因;研究了手征性超表面单元结构的连续圆金属贴片半径和介质层厚度对该结构旋光性和负折射特性的影响。数值模拟结果表明:该结构在0.1～2 THz频率范围内有4个谐振频点,在谐振频点附近,平均折射率均为负值,实部幅值最大为-3.7;该结构在谐振频点附近显示了巨旋光性以及双频带的左旋圆偏振波和右旋圆偏振波负折射特性,最大偏振旋转角达到了122°,右旋圆偏振波折射率实部幅值可达-12.74。
A dual-band chiral metasurface structure with giant optical activity and negative refractivity is proposed, which is composed of a periodic array of a middle dielectric layer and two conjugated gammadion layers. The reasons for the occurrences of giant optical activity and negative refractive indexes are clarified by analyzing the surface current density distributions. The effects of the radius of the connected circular metallic patch in the unit structure of the chiral metasurface and the thickness of the dielectric layer on optical activity and negative refractivity are studied. The numerical simulation results show that there are four resonance frequencies within the frequency range from 0.1 THz to 2 THz, and near these resonance frequencies, the average refractive index is negative and the maximal magnitude of the real part is-3.7. The proposed structure indicates its exceptional giant optical activity as well as its dual-band negative refractivity for a left circularly polarized wave and a right circularly polarized wave near these resonance frequencies. The maximum polarization rotation angle reaches 122° and the magnitude of the real part of the refractive index of a right circularly polarized wave reaches-12.74.
A dual-band chiral metasurface structure with giant optical activity and negative refractivity is proposed, which is composed of a periodic array of a middle dielectric layer and two conjugated gammadion layers. The reasons for the occurrences of giant optical activity and negative refractive indexes are clarified by analyzing the surface current density distributions. The effects of the radius of the connected circular metallic patch in the unit structure of the chiral metasurface and the thickness of the dielectric layer on optical activity and negative refractivity are studied. The numerical simulation results show that there are four resonance frequencies within the frequency range from 0.1 THz to 2 THz, and near these resonance frequencies, the average refractive index is negative and the maximal magnitude of the real part is-3.7. The proposed structure indicates its exceptional giant optical activity as well as its dual-band negative refractivity for a left circularly polarized wave and a right circularly polarized wave near these resonance frequencies. The maximum polarization rotation angle reaches 122° and the magnitude of the real part of the refractive index of a right circularly polarized wave reaches-12.74.
引文
[1] Cole M A,Chen W C,Liu M K,et al.Strong broadband terahertz optical activity through control of the Blaschke phase with chiral metasurfaces[J].Physical Review A,2017,8(1):014019.
[2] Zheludev N I,Kivshar Y S.From metamaterials to metadevices[J].Nature Materials,2012,11(11):917-924.
[3] Hannam K,Powell D A,Shadrivov I V,et al.Broadband chiral metamaterials with large optical activity[J].Physical Review B,2014,89(12):125105.
[4] Rogacheva A V,Fedotov V A,Schwanecke A S,et al.Giant gyrotropy due to electromagnetic-field coupling in a bilayered chiral structure[J].Physical Review Letters,2006,97(17):177401.
[5] Jia Y P,Zhang Y L,Dong X Z,et al.Complementary chiral metasurface with strong broadband optical activity and enhanced transmission[J].Applied Physics Letters,2014,104(1):011108.
[6] Wongkasem N,Akyurtlu A.Light splitting effects in chiral metamaterials[J].Journal of Optics,2010,12(3):035101.
[7] Dincer F.Investigation and physical interpretation of H-shaped metamaterials in X-band waveguide for microwave filter applications[J].Journal of Electronic Materials,2016,45(1):812-819.
[8] Liu J J,Luo X Y,Liu D Y,et al.Investigation on optical property and negative refractive index in double-layer chiral structure of optical region[J].Acta Optica Sinica,2014,34(1):0116003.刘锦景,罗孝阳,刘道亚,等.光频段双层手征结构光学特性及负折射率研究[J].光学学报,2014,34(1):0116003.
[9] Cheng Y Z,Chen H R,Zhao J C,et al.Chiral metamaterial absorber with high selectivity for terahertz circular polarization waves[J].Optical Materials Express,2018,8(5):1399-1409.
[10] Karaaslan M,Bakir M.Chiral metamaterial based multifunctional sensor applications[J].Progress in Electromagnetics Research,2014,149:55-67.
[11] Wu J F,Ng B,Turaga S P,et al.Free-standing terahertz chiral meta-foils exhibiting strong optical activity and negative refractive index[J].Applied Physics Letters,2013,103(14):141106.
[12] Zalkovskij M,Malureanu R,Kremers C,et al.Optically active Babinet planar metamaterial film for terahertz polarization manipulation[J].Laser & Photonics Reviews,2013,7(5):810-817.
[13] Li Y,Huang Q,Wang D C,et al.Polarization-independent broadband terahertz chiral metamaterials on flexible substrate[J].Applied Physics A,2014,115(1):57-62.
[14] Sonsilphong A,Gutruf P,Withayachumnankul W,et al.Flexible bi-layer terahertz chiral metamaterials[J].Journal of Optics,2015,17(8):085101.
[15] Hannam K,Powell D A,Shadrivov I V,et al.Dispersionless optical activity in metamaterials[J].Applied Physics Letters,2013,102(20):201121.
[16] Huang Y Y,Yao Z H,Wang Q,et al.Coupling Tai Chi chiral metamaterials with strong optical activity in terahertz region[J].Plasmonics,2015,10(4):1005-1011.
[17] Ma X L,Xiao Z Y,Liu D J.Dual-band cross polarization converter in bi-layered complementary chiral metamaterial[J].Journal of Modern Optics,2016,63(10):937-940.
[18] Tang J Y,Xiao Z Y,Xu K K,et al.Cross polarization conversion based on a new chiral spiral slot structure in THz region[J].Optical and Quantum Electronics,2016,48(2):111.
[19] Xu K K,Xiao Z Y,Tang J Y,et al.Dispersionless and giant optical activity in terahertz chiral metamaterials[J].Plasmonics,2016,11(5):1257-1264.
[20] Zhai X M,Zhou X,Yao L F,et al.Complementary chiral metamaterial with multi-band asymmetric transmission and mutual conversion[J].Journal of Electromagnetic Waves and Applications,2016,30(8):1005-1020.
[21] Ma X L,Xiao Z Y,Liu D J,et al.Dispersionless optical activity based on novel windmill-shaped chiral metamaterial[J].Modern Physics Letters B,2016,30(4):1650033.
[22] Kordi M,Mirsalehi M M.Optical chiral metamaterial based on the resonant behaviour of nanodiscs[J].Journal of Modern Optics,2016,63(15):1473-1479.
[23] Jia X L,Wang X O,Meng Q X,et al.Tunable multi-band chiral metamaterials based on double-layered asymmetric split ring resonators[J].Physica E,2016,81:37-43.
[24] Philip E,Zeki Güng?rdü M,Pal S,et al.Review on polarization selective terahertz metamaterials:from chiral metamaterials to stereometamaterials[J].Journal of Infrared,Millimeter,and Terahertz Waves,2017,38(9):1047-1066.
[25] Cheng Y Z,Nie Y,Cheng Z Z,et al.Chiral metamaterials with giant optical activity and negative refractive index based on complementary conjugate-swastikas structure[J].Journal of Electromagnetic Waves and Applications,2013,27(8):1068-1076.
[26] Cheng Y Z,Huang M L,Chen H R,et al.Influence of the geometry of a gammadion stereo-structure chiral metamaterial on optical properties[J].Journal of Modern Optics,2017,64(15):1487-1494.
[27] Cheng Y Z,Wu C J,Cheng Z Z,et al.Ultra-compact multi-band chiral metamaterial circular polarizer based on triple twisted split-ring resonator[J].Progress in Electromagnetics Research,2016,155:105-113.
[28] Cheng Y Z,Yang Y L,Zhou Y J,et al.Complementary Y-shaped chiral metamaterial with giant optical activity and circular dichroism simultaneously for terahertz waves[J].Journal of Modern Optics,2016,63(17):1675-1680.
[29] Li M H,Song J,Wu F.Ultra-compact chiral metamaterial with negative refractive index based on miniaturized structure[J].Journal of Magnetism and Magnetic Materials,2017,426:150-154.
[30] Zarifi D,Soleimani M,Nayyeri V.Dual- and multiband chiral metamaterial structures with strong optical activity and negative refraction index[J].IEEE Antennas and Wireless Propagation Letters,2012,11:334-337.
[31] He M X,Han J G,Tian Z,et al.Negative refractive index in chiral spiral metamaterials at terahertz frequencies[J].Optik,2011,122(18):1676-1679.
[32] Cheng Y Z,Gong R Z,Wu L.Ultra-broadband linear polarization conversion via diode-like asymmetric transmission with composite metamaterial for terahertz waves[J].Plasmonics,2017,12(4):1113-1120.
[33] Li Z F,Zhao R K,Koschny T,et al.Chiral metamaterials with negative refractive index based on four “U” split ring resonators[J].Applied Physics Letters,2010,97(8):081901.
[34] Zarifi D,Soleimani M,Nayyeri V.Parameter retrieval of chiral metamaterials based on the causality principle[J].International Journal of RF and Microwave Computer-Aided Engineering,2013,23(5):610-618.
[35] Han S,Yang H L,Guo L Y,et al.Manipulating linearly polarized electromagnetic waves using the asymmetric transmission effect of planar chiral metamaterials[J].Journal of Optics,2014,16(3):035105.
[36] Sun H H,Yan F P,Tan S Y,et al.Simulation analysis on design of permeability-near-zero terahertz metamaterials[J].Chinese Journal of Lasers,2018,45(6):0614001.孙慧慧,延凤平,谭思宇,等.磁导率近零太赫兹超材料设计的仿真分析[J].中国激光,2018,45(6):0614001.
[37] Liu Y,Chen Y G.Resonance of I-shaped metamaterials[J].Acta Optica Sinica,2018,38(3):0324001.刘瑶,陈跃刚.工型超材料共振研究[J].光学学报,2018,38(3):0324001.
[38] Zhang S,Zhou J F,Park Y S,et al.Photoinduced handedness switching in terahertz chiral metamolecules[J].Nature Communications,2012,3:942.
[2] Zheludev N I,Kivshar Y S.From metamaterials to metadevices[J].Nature Materials,2012,11(11):917-924.
[3] Hannam K,Powell D A,Shadrivov I V,et al.Broadband chiral metamaterials with large optical activity[J].Physical Review B,2014,89(12):125105.
[4] Rogacheva A V,Fedotov V A,Schwanecke A S,et al.Giant gyrotropy due to electromagnetic-field coupling in a bilayered chiral structure[J].Physical Review Letters,2006,97(17):177401.
[5] Jia Y P,Zhang Y L,Dong X Z,et al.Complementary chiral metasurface with strong broadband optical activity and enhanced transmission[J].Applied Physics Letters,2014,104(1):011108.
[6] Wongkasem N,Akyurtlu A.Light splitting effects in chiral metamaterials[J].Journal of Optics,2010,12(3):035101.
[7] Dincer F.Investigation and physical interpretation of H-shaped metamaterials in X-band waveguide for microwave filter applications[J].Journal of Electronic Materials,2016,45(1):812-819.
[8] Liu J J,Luo X Y,Liu D Y,et al.Investigation on optical property and negative refractive index in double-layer chiral structure of optical region[J].Acta Optica Sinica,2014,34(1):0116003.刘锦景,罗孝阳,刘道亚,等.光频段双层手征结构光学特性及负折射率研究[J].光学学报,2014,34(1):0116003.
[9] Cheng Y Z,Chen H R,Zhao J C,et al.Chiral metamaterial absorber with high selectivity for terahertz circular polarization waves[J].Optical Materials Express,2018,8(5):1399-1409.
[10] Karaaslan M,Bakir M.Chiral metamaterial based multifunctional sensor applications[J].Progress in Electromagnetics Research,2014,149:55-67.
[11] Wu J F,Ng B,Turaga S P,et al.Free-standing terahertz chiral meta-foils exhibiting strong optical activity and negative refractive index[J].Applied Physics Letters,2013,103(14):141106.
[12] Zalkovskij M,Malureanu R,Kremers C,et al.Optically active Babinet planar metamaterial film for terahertz polarization manipulation[J].Laser & Photonics Reviews,2013,7(5):810-817.
[13] Li Y,Huang Q,Wang D C,et al.Polarization-independent broadband terahertz chiral metamaterials on flexible substrate[J].Applied Physics A,2014,115(1):57-62.
[14] Sonsilphong A,Gutruf P,Withayachumnankul W,et al.Flexible bi-layer terahertz chiral metamaterials[J].Journal of Optics,2015,17(8):085101.
[15] Hannam K,Powell D A,Shadrivov I V,et al.Dispersionless optical activity in metamaterials[J].Applied Physics Letters,2013,102(20):201121.
[16] Huang Y Y,Yao Z H,Wang Q,et al.Coupling Tai Chi chiral metamaterials with strong optical activity in terahertz region[J].Plasmonics,2015,10(4):1005-1011.
[17] Ma X L,Xiao Z Y,Liu D J.Dual-band cross polarization converter in bi-layered complementary chiral metamaterial[J].Journal of Modern Optics,2016,63(10):937-940.
[18] Tang J Y,Xiao Z Y,Xu K K,et al.Cross polarization conversion based on a new chiral spiral slot structure in THz region[J].Optical and Quantum Electronics,2016,48(2):111.
[19] Xu K K,Xiao Z Y,Tang J Y,et al.Dispersionless and giant optical activity in terahertz chiral metamaterials[J].Plasmonics,2016,11(5):1257-1264.
[20] Zhai X M,Zhou X,Yao L F,et al.Complementary chiral metamaterial with multi-band asymmetric transmission and mutual conversion[J].Journal of Electromagnetic Waves and Applications,2016,30(8):1005-1020.
[21] Ma X L,Xiao Z Y,Liu D J,et al.Dispersionless optical activity based on novel windmill-shaped chiral metamaterial[J].Modern Physics Letters B,2016,30(4):1650033.
[22] Kordi M,Mirsalehi M M.Optical chiral metamaterial based on the resonant behaviour of nanodiscs[J].Journal of Modern Optics,2016,63(15):1473-1479.
[23] Jia X L,Wang X O,Meng Q X,et al.Tunable multi-band chiral metamaterials based on double-layered asymmetric split ring resonators[J].Physica E,2016,81:37-43.
[24] Philip E,Zeki Güng?rdü M,Pal S,et al.Review on polarization selective terahertz metamaterials:from chiral metamaterials to stereometamaterials[J].Journal of Infrared,Millimeter,and Terahertz Waves,2017,38(9):1047-1066.
[25] Cheng Y Z,Nie Y,Cheng Z Z,et al.Chiral metamaterials with giant optical activity and negative refractive index based on complementary conjugate-swastikas structure[J].Journal of Electromagnetic Waves and Applications,2013,27(8):1068-1076.
[26] Cheng Y Z,Huang M L,Chen H R,et al.Influence of the geometry of a gammadion stereo-structure chiral metamaterial on optical properties[J].Journal of Modern Optics,2017,64(15):1487-1494.
[27] Cheng Y Z,Wu C J,Cheng Z Z,et al.Ultra-compact multi-band chiral metamaterial circular polarizer based on triple twisted split-ring resonator[J].Progress in Electromagnetics Research,2016,155:105-113.
[28] Cheng Y Z,Yang Y L,Zhou Y J,et al.Complementary Y-shaped chiral metamaterial with giant optical activity and circular dichroism simultaneously for terahertz waves[J].Journal of Modern Optics,2016,63(17):1675-1680.
[29] Li M H,Song J,Wu F.Ultra-compact chiral metamaterial with negative refractive index based on miniaturized structure[J].Journal of Magnetism and Magnetic Materials,2017,426:150-154.
[30] Zarifi D,Soleimani M,Nayyeri V.Dual- and multiband chiral metamaterial structures with strong optical activity and negative refraction index[J].IEEE Antennas and Wireless Propagation Letters,2012,11:334-337.
[31] He M X,Han J G,Tian Z,et al.Negative refractive index in chiral spiral metamaterials at terahertz frequencies[J].Optik,2011,122(18):1676-1679.
[32] Cheng Y Z,Gong R Z,Wu L.Ultra-broadband linear polarization conversion via diode-like asymmetric transmission with composite metamaterial for terahertz waves[J].Plasmonics,2017,12(4):1113-1120.
[33] Li Z F,Zhao R K,Koschny T,et al.Chiral metamaterials with negative refractive index based on four “U” split ring resonators[J].Applied Physics Letters,2010,97(8):081901.
[34] Zarifi D,Soleimani M,Nayyeri V.Parameter retrieval of chiral metamaterials based on the causality principle[J].International Journal of RF and Microwave Computer-Aided Engineering,2013,23(5):610-618.
[35] Han S,Yang H L,Guo L Y,et al.Manipulating linearly polarized electromagnetic waves using the asymmetric transmission effect of planar chiral metamaterials[J].Journal of Optics,2014,16(3):035105.
[36] Sun H H,Yan F P,Tan S Y,et al.Simulation analysis on design of permeability-near-zero terahertz metamaterials[J].Chinese Journal of Lasers,2018,45(6):0614001.孙慧慧,延凤平,谭思宇,等.磁导率近零太赫兹超材料设计的仿真分析[J].中国激光,2018,45(6):0614001.
[37] Liu Y,Chen Y G.Resonance of I-shaped metamaterials[J].Acta Optica Sinica,2018,38(3):0324001.刘瑶,陈跃刚.工型超材料共振研究[J].光学学报,2018,38(3):0324001.
[38] Zhang S,Zhou J F,Park Y S,et al.Photoinduced handedness switching in terahertz chiral metamolecules[J].Nature Communications,2012,3:942.