Fano resonance is possible in symmetric silver-silica-silver multilayer nanoshells. Core offsets result in the enhancement
of Fano resonances. The wavelength of the Fano resonance peaks can be tuned as a function of the core offset.
A metallic nanoparticle can act as an optical antenna, enhancing the fluorescence of nearby fluorescent molecules. We
investigate the effects of a silica spacer layer on this fluorescence enhancement. Numerical simulations using the Finite-
Difference Time Domain (FDTD) method is performed to find the optimum size for the gold nanosphere core as well as
the optimum thickness of the silica shell. We present the dependence of radiative decay rate and quantum yield of the
fluorescent molecule with respect to varying silica layer thicknesses.
Following the development of MEMS fabrication technique, novel patch antennas are developed to become reality using surface micromachining process. In this paper, surface micromachined patch antennas are investigated and fabricated to have an excellent RF performance. The square patch antenna is designed to operate in its dominant mode with the broad radiation pattern of approximately 6.5dB in directivity. The impedance bandwidth is approximately 1.5% and the radiation efficiency is approximately 53%. The radiation patterns of micromachined patch antennas are broad in nature, when operating from 13 to 22GHz. Since the radiation efficiency and directivity (gain) of the individual element is rather weak, arrays are designed to obtain better overall the radiation efficiency and directivity.
A fiber electronic speckle pattern interferometry (ESPI) system composed by two sets of Leendertz dual-beam illumination arranged in perpendicular directions is applied to determine residual stresses of materials combining with the blind-hole-drilling method. Although high stress concentration and severe surface decorrelation resulted from hole-drilling process would affect the fringe visibility considerably, the system still generates satisfactory fringe patterns from the point of view of data retrieval. Simple approaches to interpret values of uniaxial and uniform residual stresses from displacement sensitive fringe contours are described and demonstrated for industrial applications.
A 2-D in-plane displacement sensitive fiber electronic speckle pattern interferometry (ESPI) is developed. With a fiber optics beam splitter of one input and four outputs, two sets of dual-beam interferometrical configuration are constructed in orthogonal directions to determine in-plane displacements completely. A CCD camera with a zoom lens is located at 320 mm to approximately 550 mm away from the specimen to provide adequate space for operation. A testing area ranging from 1.4 mm X 1 mm up to 30 mm X 24 mm can be examined in quasi real-time. In general, the system is capable of determining in-plane displacement and deformation generated by any means. Incorporating with the hole drilling technique, it is currently used to measure residual stress. Two applications are reported in this paper. One is to determine residual stress of a thick cylinder consisting of two concentric circular tubes with interference fit. A simple approach to interpret the value of residual stress from the displacement contour is presented. The other application is to analyze residual stress of recordable optical compact discs (CD-R).
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