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Modeling or rock slope stability and rockburst by the rock failure process analysis (RFPA) method
Chun'an Tang,Shibin Tang 한국암반공학회 2011 한국암반공학회 학술대회 및 세미나 자료집 Vol.2011 No.9
Brittle failure of rock is a classical rock mechanics problem. Rock failure not only involves initiation and propagation of single crack, but also is a complex problem associated with initiation, propagation and coalescence of many cracks. As the most important feature of rock material properties is the heterogeneity, the Weibull statistical distribution is employed in the rock failure process analysis (RFPA) method to describe the heterogeneity in rock properties. In this paper, the applications of the RFPA method in geotechnical engineering and rockburst modeling are introduced with emphasis, which can provide some references for relevant researches.
Chen, Jing,Nie, Hai,Peng, Cheng,Qi, Shibin,Tang, Chaojun,Zhang, Ying,Wang, Lianhui,Park, Gun-Sik IEEE 2018 Journal of Lightwave Technology Vol.36 No.16
<P>We report an effective method to enhance and modify the magnetic plasmon (MP) resonance in three-dimensional (3D) optical metamaterials consisting of periodic arrays of silver vertical split-ring resonators (VSRRs) for high-sensitivity sensing. By positioning the 3D metamaterials above a thick silver film separated by a silica dielectric spacer layer, the strong coupling between the MP resonance in the VSRRs and the surface plasmons polaritons (SPPs) propagating on the silver film can be realized and gives rise to an ultra-narrowband hybrid MP mode with a huge enhancement of magnetic fields. For the coupling to happen, the magnetic field direction of the SPPs should be parallel to the magnetic moment induced in the VSRRs. More importantly, because the ultra-narrowband hybrid MP mode is extremely sensitive to the surrounding media, the sensitivity and the figure of merit (FOM) of the 3D metamaterials can reach as high as 700 nm/RIU and 170, respectively, suggesting that the proposed 3D metamaterials hold potential applications in label-free biomedical sensing.</P>
Photonic Microcavity-Enhanced Magnetic Plasmon Resonance of Metamaterials for Sensing Applications
Chen, Jing,Peng, Cheng,Qi, Shibin,Zhang, Qian,Tang, Chaojun,Shen, Xueyang,Da, Haixia,Wang, Lianhui,Park, Gun-Sik IEEE 2019 IEEE Photonics Technology Letters Vol.31 No.2
<P>We first investigate numerically photonic microcavity-enhanced magnetic plasmon (MP) resonance in metamaterials for high-quality refractive index sensing. The metamaterials consist of a top periodic array of U-shaped metallic split-ring resonators (SRRs), a middle dielectric layer, and a bottom metallic backed plate. The top metallic SRRs that are placed at about Bragg distance above the bottom metallic plate constitute a photonic microcavity. Because the MP resonance excited in metallic SRRs is coupled to the photonic microcavity mode supported by the photonic microcavity, the radiative damping of the MP resonance is strongly reduced, and consequently, its linewidth is decreased dramatically. Benefiting from the narrow linewidth, large modulation depth, and giant magnetic field enhancement at the MP resonance, the cavity-coupled metamaterial sensor has very high sensitivity ( <TEX>$\text {S}= 400$</TEX> nm/RIU and <TEX>$\text {S}^{\ast } = 26$</TEX>/RIU) and figure of merit ( <TEX>$\text {FOM}= 33$</TEX> and FOM* = 4215), which suggests that the proposed metamaterials have potential in applications of plasmonic biosensors.</P>