Sensitive THz sensing based on Fano resonance in all-polymeric Bloch surface wave structure

被引:13
作者
Zhang, Chi [1 ]
Liu, Qiang [3 ]
Peng, Xiao [1 ]
Ouyang, Zhengbiao [1 ]
Shen, Suling [1 ,2 ]
机构
[1] Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Peoples R China
[2] Shenzhen Univ, Hlth Sci Ctr, Sch Biomed Engn,Natl Reg Key Technol Engn Lab Med, Guangdong Key Lab Biomed Measurements & Ultrasoun, Shenzhen 518060, Peoples R China
[3] Southern Univ Sci & Technol, Dept Biomed Engn, Shenzhen 518055, Guangdong, Peoples R China
关键词
Bloch surface wave; Fano resonance; high Q factor; THz sensor; ELECTROMAGNETICALLY INDUCED TRANSPARENCY; BOUND-STATES; TERAHERTZ; CONTINUUM; MODES; BAND; DESIGN; ANALOG; PHASE; LIGHT;
D O I
10.1515/nanoph-2021-0339
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Simultaneous realization of high quality factor (Q), sensitivity, and figure of merit (FOM) play a pivotal role in building the THz sensor. For such purpose, we propose an all-polymeric Bloch surface wave (BSW) structure that supports a bright BSW mode and a dark surface Fano state that is embedded in the continuum, both of which coupled to the same radiation channels. The existence of the sharp dip with a maximum depth of Fano line could be interpreted with the physics of Friedrich-Wintgen bound states in the continuum (FW-BICs), because of the destructive interference between bright BSW and dark surface Fano modes. A strong angular- and frequency-dependent Q was found. Related influential factors to Q value may also include an asymmetric arrangement of top and grating layers, together with the weak coupling provided by photonic crystals. One numerically optimized design shows a quality factor Q of the Fano mode as 23,670, which is almost two orders higher than that in conventional metallic-metamaterial-based designs. The optimized sensitivity can numerically reach 4.34 THz/RIU in the frequency domain, which is one order higher than that reported in all-dielectric metasurfaces. We infer the high sensitivity is related to the phase-matching condition provided by near-subwavelength gratings. The associated FOM can reach 8857/RIU. Besides, the proposed design also numerically demonstrates high sensitivity in the angular domain similar to 125.5 degrees/RIU. Considering it poses no specific requirement for materials that own high contrast of permittivity in the THz regime, large interfacing area, the mechanical and chemical robustness offered by polymers and low cost in fabrication, such all-polymeric BSW structure that supports novel Fano resonance in THz window may give access to rich applications in hazardous gas detection and label-free bio-sensing.
引用
收藏
页码:3879 / 3888
页数:10
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