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Flexible control of terahertz waves is now a research hotspot. Based on the electromagnetic theory the dispersion relation and field distributions in a plasmon-assisted parallel-plated waveguide are deduced. The transmission property of such a waveguide is obtained and confirmed by the full-wave simulation. Results show that the plasmon-assisted parallel-plated waveguide shows a band gap characteristic, and the cutoff frequency of the upper sideband is equal to the plasmon frequency; generally, the thinner the plasmon layer, the higher the cutoff frequency will be, and the narrower the bandwidth will become. Emergence of the band gap is due to the excited surface plasmon polaritons, and the coupling between surface plasmon and the medium in the waveguide. Besides, the influence of plasmon frequency and collision frequency on the transmission properties is investigated, and a method for adjusting the filter characteristic of the waveguide by tuning the plasmon frequency is proposed. Moreover, the plasmon layer is realized by a textured metallic structure, and a sensing model based on the parallel-plated waveguide is designed. Simulation results show that a 0.1 percent change in permittivity of the sample materials filling in the groove will give rise to a significant change of the cutoff frequency, which is 1.8 GHz in average; interestingly, different liquid samples such as nitrogen, gasoline, paraffin, glycerine and water can be identified through detecting the change of cutoff frequency, which further confirms the excellent terahertz sensing characteristic of the proposed sensor. This work may be helpful for the study of terahertz wave transmission, and may have potential applications in the design of terahertz devices.
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Keywords:
- parallel-plated waveguide /
- terahertz /
- surface plasmon /
- sensor
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[1] Shaghik A, Shahraam A V, Tanya M M, Derek A 2013 Advances in Optics and Photonics 5 169
[2] Chen P Y, Huang H Y, Akinwande D, Alu A 2014 ACS Photonics 1 647
[3] Pozar N M 2007 Microwave Engineering (Beijing: Publishing House of Electronics Industry) p83 (in Chinese) [张肇仪, 周乐柱, 吴德明等译2007微波工程(北京: 电子工业出版社)第83页]
[4] Mendis R, Grischkowsky D 2001 Opt. Lett. 26 846
[5] Mendis R, Mittleman D M 2009 Opt. Express 17 14839
[6] Astley V, Reichel K S, Jones J, Mendis R, Mittleman D M 2012 Appl. Phys. Lett. 100 231108
[7] Schurig D, Mock J J, Justice B J, Cummer S A, Pendry J B, Starr A F, Smith D R 2006 Science 314 977
[8] Silveirinha M, Engheta N 2006 Phys. Rev. Lett. 97 157403
[9] Luo J, Lu W X, Hang Z H, Chen H Y, Hou B, Lai Y, Chan C T 2014 Phys. Rev. Lett. 112 073903
[10] Ourir A, Maurel A, Pagneux V 2013 Opt. Lett. 38 2092
[11] Wu Z Y, Huang M, Yang J J, Yu J, Peng J H 2009 Chinese Journal of Lasers 36 458 (in Chinese) [吴中元, 黄铭, 杨晶晶, 余江, 彭金辉 2009 中国激光 36 458]
[12] Li D Y, Li E P 2013 Opt. Lett. 38 3384
[13] Bahadori M, Eshaghian A, Mehrany K 2014 Journal of lightwave technology 32 2659
[14] Bozhevolnyi S I, Volkov V S, Devaux E, Laluet J Y, Ebbesen T W 2006 Nature 440 508
[15] Han B, Jiang C 2009 Appl. Phys. B 95 97
[16] Li J F, Li Z Y 2014 Chin. Phys. B 23 047305
[17] Xu Y D, Wu Q N, Chen H Y 2014 Laser Photonics Reviews 8 562
[18] Akyildiz I F, Jornet J M, Han C 2014 Physical Communication 12 16
[19] Lan F, Gao X, Qi L M 2014 Acta Phys. Sin. 63 104209 (in Chinese) [兰峰, 高喜, 亓丽梅 2014 物理学报 63 104209]
[20] Yang J Q, Li S X, Zhao H W, Zhang J B, Yang N, Jing D D, Wang C Y, Han J Guang 2014 Acta Phys. Sin. 63 133203 (in Chinese) [杨静琦, 李绍限, 赵红卫, 张建兵, 杨娜, 荆丹丹, 王晨阳, 韩家广 2014 物理学报 63 133203]
[21] Tonouchi M 2007 Nature Photonics 1 97
[22] Xu J Z, Zhang X C 2007 Terahertz science technology and application (Beijing: Beijing University Press) p9 (in Chinese) [许景周, 张希成2007太赫兹科学技术与应用(北京: 北京大学出版社)第9页]
[23] Garcia-Vidal F J, Martin-Moreno L, Pendry J B 2007 J. Opt. A: Pure Appl. Opt. 7 S97
[24] Ng B H, Wu J F, Hanham S M, Fernández-Domínguez A I, Klein N, Liew Y F, Breese M B H, Hong M H, Maier S A 2013 Adv. Optical Mater. 1 543
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