利用太赫兹时域光谱仪测试系统,研究了聚酰亚胺衬底上的\,C\,形开口环周期性结构在太赫兹波段的异常透射特性.结果发现, 当入射太赫兹波的电场偏振方向垂直于金属开口时,变化的电场引起电感--电容\,(LC)\,共振, 使其透射光谱呈现单峰特性;然而, 当入射电场偏振方向平行于金属开口时,其透射光谱呈现出多峰性和周期性.通过对其电场能量分布和表面电流的分析发现,这种反常透射特性是由法布里-波罗腔效应和偶极子共振共同作用产生的.
Polarization dependence of terahertz (THz) extraordinary transmission from a flexible C-shape split-ring resonance (C-shape SRR) is investigated. When the THz polarization is perpendicular to the gap of C-shape SRR, a single-peak resonance is observed owing to the inductive-capacitive (LC) resonance. When the THz polarization is parallel to the gap of C-shape SRR, a periodic multiple resonances phenomenon is observed. The simulation of the electric density distribution and surface current indicate that the asymmetric Fabry-P\'{e}rot effect of the C-shape SRR attributes to the periodic resonances.
[1]JOHNSTON M B. Plasmonics: Superfocusing of terahertz waves [J].Nature Photonics, 2007(1): 14-15.
[2]WILLIAMS C R, ANDREWS S R, MAIER S A, et al. Highly confined guiding of terahertz surface plasmonpolaritons on structured metal surfaces[J]. Nature Photonics, 2008(2): 175-179.
[3]CAO W, SONG C Y, LANIER T E, et al. Tailorig terahertz plasmons with silver nanorod arrays [J]. Scientific Reports, 2013(3): 1766.
[4]MASSON J B, G. GALLOT. Coupling between surface plasmons in subwavelength hole arrays [J]. Physics Review B, 2006, 73: 121401.
[5]CHEN H T, LU H, AZAD A K, et al. Electronic control of extraordinaryterahertz transmission through subwavelength metal hole arrays [J]. Optics Express, 2008, 16: 7641-7648.
[6]LI G F, JIN Z M, XUE X, et al. Terahertz coherence control of surface plasmon polariton propagation in subwavelength metallic hole arrays [J]. Applied Physics Letters, 2012, 100: 191115.
[7]EBESEN T W, LEZEC H J, GHAEMI H F, et al. Extraordinary optical transmission through sub-wavelength hole arrays [J]. Nature, 1998,391: 667-669.
[8]GORDON R, BROLO A G, MCKINNON A, et al. Strong polarization in the optical transmission through Elliptical nanohole arrays [J].Physics Review Letters, 2004, 92: 037401.
[9]CAO Q, LALANNE P. Negative role of surface plasmons in the transmission of metallic gratings with very narrow slits [J].Physics Review Letters, 2002, 88: 057403.
[10]YE Y H, ZHANG J Y. Middle-infrared transmission enhancement through periodically perforated metal films [J]. Applied Physics Letters,2007, 84: 2977-2979.
[11]ORDAL M A, LONG L L, BELL R J, et al. Optical propertiesof the metals Al, Co, Cu, Au, Fe, Pb, Ni, Pd, Pt, Ag, Ti, and W in the infrared and far infrared [J]. Applied Optics, 1983, 22:
1099-1120.
[12]ZHANG W. Resonant terahertz transmission in plasmonic arrays ofsubwavelength holes [J]. The European Physical Journal AppliedPhysics, 2008, 43: 1-18.
[13]PADILLA W J, TAYLOR A J, HIGHSTRETE C, et al. Dynamical electric andmagnetic metamaterial response at terahertz frequencies [J]. PhysicsReview Letters, 2006, 96: 107401.
[14] CHEN H T, O'HARA J F, TAYLOR A J, et al. Complementaryplanar terahertz metamaterials [J]. Optics Express, 2007, 15:1084-1095.
[15] KHODASEVYCH I E, SHAH C M, SRIRAM S, et al. Elastomericsilicone substrates for terahertz fishnet metamaterials [J]. AppliedPhysics Letters, 2012, 100: 061101.
[16] TAO H, STRIKWERDA A C, FAN K, et al. Terahertz metamaterialson free-standing highly-flexible polyimide substrates [J]. Journalof Physics D: Applied Physics, 2008, 41: 232004.
[17]MIYAMARU F, TAKEDA M W, TAIMA K. Characterization of terahertzmetamaterials fabricated on flexible plastic films: Towardfabrication of bulk metamaterials in terahertz region [J]. AppliedPhysics Express, 2009(2): 042001.
[18] AZAD A K, CHEN H T, KASARLA S R, et al. Ultrafastoptical control of terahertz surface plasmons in subwavelength holearrays at room temperature [J]. Applied Physics Letters,2009,95:011105
[19] BASS M. Handbook of Optics [M]. 3rd ed. New York:McGraw-Hill, 2010.
中国综合性科技类核心期刊(北大核心)