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Modelling of Laser—Generated guided waves in Bonded Plates with a Weak Interface by the Two—Layer Normal Mode Expansion Method

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Chinese Physics Letters 2003年第1期20卷 76-79页

作者：杜珺程建春 InstituteofAcousticsandNationalLaboratoryofModernofModernAcoustics NanjingUniversityNanjing210093 InstituteofAcousticsandNationalLaboratoryofModernofModernAcoustics NanjingUni

The two-layer normal mode expansion method is employed to analyse the laser-generated elastic guided waves in bonded plates accounting for the adhesive bond layer in terms of a weak interface with the spring model. The sensitivity of dispersion and transient characteristics of the guided wave to the stiffness coefficients characterizing the cohesive quality is analysed in details. This method provides a new promising way for the characterization of the cohesive quality in bonded plates.

关键词： guided electromagnetic wave propagation

guided modes in the chiral negative refractive index fiber

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维普期刊数据库

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Chinese Optics Letters 2010年第11期8卷 1032-1036页

作者：董建峰李杰 Institute of Optical Fiber Communication and Network Technology Ningbo University

The novel characteristics of guided modes in the chiral negative refractive index fiber are investigated theoretically in this *** derive the characteristic equation of guided *** on two types of chiral metamaterial parameters,we present the dispersion curves,energy flux,and power of guided *** abnormal features,such as the existence of surface mode and dispersion curves with different shapes,intersection of dispersion curves of different guided modes,negative energy flux in the achiral cladding,and zero power at some normalized frequencies,are found in the chiral negative refractive index fiber.

关键词： Dispersion (waves) guided electromagnetic wave propagation Light refraction Metamaterials Refractometers

Photonic crystal waveguides and their applications Invited Paper

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Chinese Optics Letters 2008年第10期6卷 704-708页

作者：黄翊东毛晓宇张超曹磊崔开宇张巍彭江得 State Key Laboratory of Integrated Optoelectronics Department of Electronic EngineeringTsinghua UniversityBeijing 100084

Two-dimensional （2D） slab photonic crystal waveguides （PCWGs） on silicon-on-insulator （SOI） wafer were designed and fabricated. Full photonic band gap, band gap guided mode, and index guided mode were observed by measuring the transmission spectra. Mini-stop-bands in the PCWG were simulated with different structure parameters. Coupling characteristics of PCWG were investigated theoretically considering the imperfections during the fabrication process. It was found that suppressing power reservation effect can realize both short coupling length and high coupling efficiency.

关键词： Crystal atomic structure Energy gap Gallium alloys guided electromagnetic wave propagation Laser optics Mechanisms Optical waveguides Photonic crystals Powders Semiconducting silicon compounds Silicon Silicon wafers Two dimensional waveguides

A novel biosensor with enhanced sensitivity based on grating coupled double-layered porous silicon waveguide

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Optoelectronics Letters 2012年第3期8卷 179-181页

作者：吕小毅莫家庆张红燕钟福如贾振红 Postdoctoral Station of Computer Science and Technology Xinjiang University Colleges of Information Science and Engineering Xinjiang University School of Electronic and Information Engineering Xi'an Jiaotong University School of Physics Xinjiang University

The enhanced sensitivity of a guided mode biosensor is analyzed by employing double-layered porous silicon grating structures. The grating-coupled waveguide structure consists of two porous silicon grating layers with different refractive indices. simulations are carried out by changing the refractive index, which is due to the binding of biological molecules on the porous silicon pore can increase the refractive index of porous silicon. The numerical results show that this novel guided mode biosensor with a double-layered grating can provide not only a very high sensitivity but also a better reflectivity characteristic.

关键词： guided electromagnetic wave propagation Porous silicon Refractive index waveguides

Simplified mode analysis of guided mode resonance gratings with asymmetric coatings

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Chinese Optics Letters 2013年第6期11卷 1-5页

作者：吴俊周常河曹红超胡安铎孙文婷贾伟 Laboratory of Information Optics and Opto-electronic Technology Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

A simplified modal method to explain the resonance phenomenon in guided mode resonance （GMR） grat- ings with asymmetric coatings is presented. The resonance observed is due to the interaction of two propagation modes inside the grating. The reflectivity spectra and electric field distributions calculated from the simplified modal method are compared using rigorous coupled-wave analysis （RCWA）. The in- fluences of high-order evanescent modes on the resonance peak are analyzed. A matrix Fabry-Perot （FP） resonance condition is developed to evaluate the resonance wavelength. An explanation for the resonance phenomenon observed based on the FP resonance phase condition is also proposed and demonstrated. The simplified method provides clear physical insights into CMR gratings that are useful for the analysis of a variety of other resonance gratings.

关键词： Coatings Electric fields guided electromagnetic wave propagation