DSpace collection: 期刊論文 https://ir.lib.ncu.edu.tw/handle/987654321/366 The collection's search engine Search the Channel s https://ir.lib.ncu.edu.tw/simple-search Infrared interference coating by use of Si(3)N(4) and SiO(2) films with ion-assisted deposition https://ir.lib.ncu.edu.tw/handle/987654321/50948 title: Infrared interference coating by use of Si(3)N(4) and SiO(2) films with ion-assisted deposition abstract: Silicon nitride (Si(3)N(4)) and silicon dioxide (SiO(2)) films were prepared by ion-assisted deposition, and a higher deposition rate was achieved for both films. The results of x-ray diffraction and transmission electron microscopy measurements showed that the films have amorphous structures. As measured by infrared (IR) spectrometry and x-ray photoelectron spectrometry, both stoichiometric films have extremely low hydrogen content. The IR optical constants of the films were determined by spectroscopic ellipsometry. Both films exhibited a low extinction coefficient at wavelengths from 2 to 7 mu m. The application of Si(3)N(4) and SiO(2) films on the IR interference coating is demonstrated. (C) 2010 Optical Society of America <br> Tue, 27 Mar 2012 10:13:29 GMT Imaging off-plane shear waves with a two-dimensional phononic crystal lens https://ir.lib.ncu.edu.tw/handle/987654321/50942 title: Imaging off-plane shear waves with a two-dimensional phononic crystal lens abstract: A two-dimensional flat phononic crystal (PC) lens for focusing off-plane shear waves is proposed. The lens consists of a triangular lattice hole-array, embedded in a solid matrix. The self-collimation effect is employed to guide the shear waves propagating through the lens along specific directions. The Dirichlet-to-Neumann maps (DtN) method is employed to calculate the band structure of the PC, which can avoid the problems of bad convergence and fake bands automatically in the void-solid PC structure. When the lens is illuminated by the off-plane shear waves emanating from a point source, a subwavelength image appears in the far-field zone. The imaging characteristics are investigated by calculating the displacement fields explicitly using the multiple scattering method, and the results are in good agreement with the ray-trace predictions. Our results may provide insights for designing new phononic devices. <br> Tue, 27 Mar 2012 10:13:23 GMT DESIGN CONSIDERATIONS FOR A 10-M OPTICAL TABLE TELESCOPE https://ir.lib.ncu.edu.tw/handle/987654321/28330 title: DESIGN CONSIDERATIONS FOR A 10-M OPTICAL TABLE TELESCOPE Tue, 29 Jun 2010 11:46:15 GMT FRINGE FORMATION WITH A CROSS-GRATING INTERFEROMETER https://ir.lib.ncu.edu.tw/handle/987654321/28328 title: FRINGE FORMATION WITH A CROSS-GRATING INTERFEROMETER Tue, 29 Jun 2010 11:46:13 GMT