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Refractive index sensing is attracting extensive attention in biochemical sensing using terahertz technology. Various structures with strong confinements have been used to design sensors for improving the interaction between the terahertz wave field and the analytes, such as photonic crystals, nanowires, plasmonic structures, and metamaterials. Terahertz wave sensors based on two-dimensional photonic crystal have been used in various areas ranging from disease diagnostics to environmental pollution detection. For improving the performance of terahertz sensor, a sensing scheme based on high-density polyethylene sunflower-typecircular photonic crystal structure is proposed. The designed sensor contains two symmetrical sample cells surrounding a cavity in a circular photonic crystal. The transmission properties of the terahertz wave sensor are analyzed based on COMSOL Multiphysics when the central sample cells are filled with analyte with different refractive indices. The sensor characteristics depending on the structure parameters are analyzed. The choice of these parameters is discussed. Finally, a sensitivity of 10.4 μm/RIU, Q-factor of 62.21, and figure-of-merit of 1.46 are realized. The results in this work are expected to be able to extend the circular photonic crystal-based sensor to terahertz wave region.
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[1] Wu F, Wu J J, Guo Z W, Jiang H T, Sun Y, Ren J, Chen H 2019 Phys. Rev. Appl. 12 014028Google Scholar
[2] Wang X P, Sang M H, Yuan W, Nie Y Y, Luo H M 2016 IEEE Photonics Technol. Lett. 28 264Google Scholar
[3] Zhang Y B, Liu W W, Li Z C, Zhi L, Cheng H, Chen S Q, Tian J G 2018 Opt. Lett. 43 1842Google Scholar
[4] Liang L, Hu X, Wen L, Zhu Y H, Yang X G, Zhou J, Zhang Y X, Carranza I E, Grant J, Jiang C P, Cumming D R S, Li B J, Chen Q 2018 Laser Photonics Rev. 12 1800078Google Scholar
[5] Xu S, Fan F, Ji Y Y, Cheng J R, Chang S J 2019 Opt. Lett. 44 2450Google Scholar
[6] 李绍和, 李九生, 孙建忠 2019 物理学报 68 104203Google Scholar
Li S H, Li J S, Sun J Z 2019 Acta Phys. Sin. 68 104203Google Scholar
[7] Chen J, Nie H, Tang C J, Cui Y H, Yan B, Zhang Z Y, Kong Y R, Xu Z J, Cai P G 2019 Appl. Phys. Express 12 052015Google Scholar
[8] 田伟, 文岐业, 陈智, 杨青慧, 荆玉兰, 张怀武 2015 物理学报 64 028401Google Scholar
Tian W, Wen Q Y, Chen Z, Yang Q H, Jing Y L, Zhang H W 2015 Acta Phys. Sin. 64 028401Google Scholar
[9] Cheng W, Han Z H, Du Y, Qin J Y 2019 Opt. Express 27 16071Google Scholar
[10] Xiang Y J, Zhu J Q, Wu L M, You Q, Ruan B X, Dai X Y 2018 IEEE Photonics J. 10 6800507
[11] Keshavarz M M, Alighanbari A 2019 Appl. Opt. 58 3604Google Scholar
[12] Padhy P, Sahu P K, Jha R 2016 Sens. Actuators B 225 115Google Scholar
[13] Janneh M, Marcellis A D, Palange E, Tenggara A T, Byun D 2018 Opt. Commun. 416 152Google Scholar
[14] Wang S H, Sun X H, Wang C, Peng G D, Qi Y L, Wang X S 2017 J. Phys. D: Appl. Phys. 50 365102Google Scholar
[15] Yan D X, Li J S, Jin L F 2019 Laser Phys. 29 025401Google Scholar
[16] Tavousi A, Rakhshani M R, Mansouri-Birjandi M A 2018 Opt. Commun. 429 166Google Scholar
[17] 王昌辉, 赵国华, 常胜江 2012 物理学报 61 157805Google Scholar
Wang C H, Zhao G H, Chang S J 2012 Acta Phys. Sin. 61 157805Google Scholar
[18] Fink Y, Winn J N, Fan S H, Chen C P, Michel J, Joannopoulos J D, Thomas E L 1998 Science 282 1679Google Scholar
[19] Wu F, Lu G, Guo Z W, Jiang H T, Xue C H, Zheng M J, Chen C X, Du G Q, Chen H 2018 Phys. Rev. Appl. 10 064022Google Scholar
[20] Wang X, Jiang X, You Q, Guo J, Dai X Y, Xiang Y J 2017 Photonics Res. 5 536Google Scholar
[21] Kraeh C, Martinez-Hurtado J L, Popescu A, Hedler H, Finley J J 2018 Opt. Mater. 76 106Google Scholar
[22] Caër C, Serna-Otálvaro S F, Zhang W W, Roux X L, Cassan E 2014 Opt. Lett. 39 5792Google Scholar
[23] Li L Q, Li T L, Ji F T, Song W P, Zhang G Y, Li Y 2017 Microsyst. Technol. 23 3271Google Scholar
[24] Ghanaatshoar M, Zamani M 2015 J. Supercond. Novel Magn. 28 1365Google Scholar
[25] Wang B, Jin H T, Zheng Z Q, Zhou Y H, Gao C 2017 Sens. Actuators B 244 344Google Scholar
[26] Li K, Feng X, Cui K Y, Zhang W, Liu F, Huang Y D 2017 Appl. Opt. 56 3096Google Scholar
[27] Ouerghi F, AbdelMalek F, Haxha S, Abid R, Mejatty H, Dayoub I 2009 J. Lightwave Technol. 27 3269Google Scholar
[28] Ge R, Xie J L, Yan B, Liu E X, Tan W, Liu J J 2018 J. Opt. Soc. Am. A 35 992Google Scholar
[29] Lee P T, Lu T W, Fan J H, Tsai F M 2007 Appl. Phys. Lett. 90 151125Google Scholar
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