نتایج جستجو برای: defect mode

تعداد نتایج: 316268  

2006
Li Chen Weidong Zhou Zexuan Qiang Gail J. Brown

In this paper, we present the simulation results on the absorption modification in photonic crystal (PC) structures. For one-dimensional (1D) PC, using transfer matrix method (TMM), we obtained enhanced absorption in both defectfree and defect based PC structures. High absorption (>60%) and small bandwidth (< 0.1 λ0) at defect level were observed with optimal absorption layers of 10-15 for stru...

Journal: :Optics express 2012
Hsi-Chun Liu Amnon Yariv

We present a systematic design of coupled-resonator optical waveguides (CROWs) based on high-Q tapered grating-defect resonators. The formalism is based on coupled-mode theory where forward and backward waveguide modes are coupled by the grating. Although applied to strong gratings (periodic air holes in single-mode silicon-on-insulator waveguides), coupled-mode theory is shown to be valid, sin...

2001
Jelena Vučković Marko Lončar Hideo Mabuchi Axel Scherer

We express the quality factor of a mode in terms of the Fourier transforms of its field components and prove that the reduction in radiation loss can be achieved by suppressing the mode’s wavevector components within the light cone. Although this is intuitively clear, our analytical proof gives us insight into how to achieve the factor optimization, without the mode delocalization. We focus on ...

ژورنال: مجله دندانپزشکی 2004
ابوالفضلی, نادر, اسکندری, امیر,

Statement of Problem: Regenerative periodontal procedures are one mode of therapy that attempts to restore the lost supporting structures of the dentition around a previously diseased root surface.Purpose: The purpose of this study was comparison between Enamel matrix proteins (EMP) used alone or in combination with autogenous bone graft (ABG) in the treatment of human intrabony periodontal def...

2011
A. Gharaati H. Azarshab

We investigate the characterization of defect modes in one-dimensional ternary symmetric metallo-dielectric photonic crystal (1DTSMDPC) band-gap structures. We consider the defect modes for symmetric model with respect to the defect layer. We demonstrate reflectance with respect to the wavelength and its dependence on different thicknesses and indices of refraction of dielectric defect layer, a...

Journal: :IEICE Transactions 2007
Akiko Gomyo Jun Ushida Tao Chu Hirohito Yamada Satomi Ishida Yasuhiko Arakawa

We report on a channel drop filter with a mode gap in the propagating mode of a photonic crystal slab that was fabricated on silicon on an insulator wafer. The results, simulated with the 3-dimensional finite-difference time-domain and plane-wave methods, demonstrated that an index-guiding mode for the line defect waveguide of a photonic crystal slab has a band gap at wave vector k = 0.5 for a ...

Journal: :research in cardiovascular medicine 0
maziar gholampour-dehaki heart valve disease research center, rajaie cardiovascular medical and research center, iran university of medical sciences, tehran, ir iran asghar zareh heart valve disease research center, rajaie cardiovascular medical and research center, iran university of medical sciences, tehran, ir iran solmaz babaki heart valve disease research center, rajaie cardiovascular medical and research center, iran university of medical sciences, tehran, ir iran; department of cardiology, ludmillenstift hospital, ludmillenstraße, meppen, germany hoda javadikasgari heart valve disease research center, rajaie cardiovascular medical and research center, iran university of medical sciences, tehran, ir iran; department of thoracic and cardiovascular surgery, cleveland clinic foundation, cleveland, ohio, usa; heart valve disease research center, rajaie cardiovascular medical and research center, vali-asr st., niayesh blvd, p. o. box: 1996911151, tehran, ir iran. tel: +1-6822192494

patients and methods previously recorded data of 231 patients who underwent surgical closure of vsd between january 2009 and january 2012 at the rajaie cardiovascular medical and research center were retrospectively reviewed. vsd surgical repair was performed using continues suturing technique in group a patients (n = 163, 70.6%) and interrupted suturing technique in group b patients (n = 68, 2...

Journal: :Physical review letters 2002
Victor I Kopp Azriel Z Genack

We demonstrate that twisting one part of a chiral photonic structure about its helical axis produces a single circularly polarized localized mode that gives rise to an anomalous crossover in propagation. Up to a crossover thickness, this defect results in a peak in transmission and exponential scaling of the linewidth for a circularly polarized wave with the same handedness as structure. Above ...

2007
Haroldo T. Hattori Hark H. Tan

This article analyzes compact laterally coupled distributed feedback DFB lasers with three defect regions. These devices are more flexible and smaller than conventional DFB lasers, having typical lengths between 20 and 50 m and a width less than 1 m lateral gratings are inserted in a single-mode waveguide . We optimize the defect regions to achieve an improved performance. In other words, an ad...

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