A high <i>Q </i> terahertz asymmetrically coupled resonator and its sensing performance

doi:10.1007/s12200-014-0431-5

Front. Optoelectron.

2015, Vol. 8

Issue (1) : 68-72 https://doi.org/10.1007/s12200-014-0431-5

RESEARCH ARTICLE

A high Q terahertz asymmetrically coupled resonator and its sensing performance

Dongwei WU,Jianjun LIU,Hao HAN,Zhanghua HAN,Zhi HONG(

)

Centre for THz Research, China Jiliang University, Hangzhou 310018, China

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Abstract

A terahertz asymmetrically coupled resonator (ACR) consisting of two different split ring resonators (SRRs) was designed. Using finite difference time domain (FDTD), the transmission of ACR and its refractive-index-based sensing performance were simulated and analyzed. Results show that the ACR possesses a sharp coupled transparent peak or high quality factor (Q), its intensity and bandwidth can be easily adjusted by spacing the two SRRs. Furthermore, the resonator exhibits high sensitivity of 75 GHz/RIU and figure of merit (FOM) of 4.4, much higher than the individual SRR sensors. The ACR were fabricated by using laser-induced and chemical non-electrolytic plating with copper on polyimide substrate, the transmission of which measured by terahertz time-domain spectroscopy system is in good agreement with simulations.

Keywords terahertz asymmetrically coupled resonator (ACR) refractive index sensing high quality factor (Q)

Corresponding Author(s): Zhi HONG

Online First Date: 19 June 2014 Issue Date: 13 February 2015

Cite this article:

Dongwei WU,Jianjun LIU,Hao HAN, et al. A high Q terahertz asymmetrically coupled resonator and its sensing performance[J]. Front. Optoelectron., 2015, 8(1): 68-72.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-014-0431-5
https://academic.hep.com.cn/foe/EN/Y2015/V8/I1/68

Fig.1 Schematic view of the proposed ACR

Fig.2 Microscopic picture of the fabricated ACR

Fig.3 Transmittance of ACR and SRRs when d = 30 μm

Fig.4 Distribution of induced currents at resonances ω₁ (a) and ω₂ (b)

Fig.5 Simulated transmission of ACR with different distances d

Fig.6 Frequency shift of the resonant peak vs refractive index of analyte

Fig.7 Comparison of transmittance spectra between simulation (black line) and experiment (red line), the distance d is 40 μm (a) and 90 μm (b)

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