共查询到20条相似文献,搜索用时 15 毫秒
1.
In this paper, the fabrication and characterization of a high-index low loss polyethylene terephatate (PET) optical waveguide is presented. Dip-coating technique has been used to fabricate the optical waveguide using PET. Various waveguide properties, such as mode effective refractive index, optical loss, dispersion and waveguide thickness as a function of temperature of waveguides and substrates have been reported. Optical losses of as low as 0.7 dB cm–1 waveguides can be obtained if the formation temperature can be controlled between 30 and 35°C. In addition, we suggested that it is a suitable material for optoelectronic waveguide devices. 相似文献
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金属包层渐变折射率介质光波导的传输特性与损耗 总被引:8,自引:2,他引:6
用金属包层介质光波导损耗的微扰理论及藉助多层近似法用递推公式分析渐变折射率波导传播常数的方法,对几种类型的金属包层渐变折射率介质光波导的传输特性与损耗进行分析和讨论,得到了与精确数值计算结果相吻合的结果. 相似文献
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将增益介质加入金属环构成的表面等离子体激元耦合共振波导,利用传输矩阵及时域有限差分方法研究了不同增益系数下该耦合共振波导的透射谱线、色散关系以及群折射率.结果表明,增益介质共振频率附近的反常色散及正常色散变化能有效影响由共振波导几何结构决定的色散关系曲线,且具有相反的效果,分别使其变得平坦和陡峭,从而放大和缩小由共振波导几何结构决定的群折射率.另外,增益系数随外加抽运光改变的特点使得加入增益介质的耦合共振波导具有传输性能可灵活调节特性.文章的研究对促进耦合共振波导在高密度光学集成中的广泛应用具有积极意义.
关键词:
增益介质
耦合共振波导
表面等离子体激元
群折射率 相似文献
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Arnab Sarkar 《Fiber and Integrated Optics》2013,32(2):135-149
Various vapor deposition processes are being used to manufacture optical fibers in different parts of the world. This paper provides an introduction to the common vapor deposition technology, reviews the different processes, and compares them in terms of performance and cost potential. 相似文献
6.
We report on our systematic and detailed study of fabrication and characterization of HNR120 photoresists thin-film optical waveguides. Various waveguide properties, such as refractive index, optical losses as a function of temperature, waveguide thickness, dispersion and birefringence have been studied. The optical loss are found to be <1.4 dB cm−1. 相似文献
7.
In this study, channel waveguides fabricated in photopolymer films by direct-writing using a low-power CW laser, are used as phase objects in a simple plane-wave diffraction setup, and the refractive index modulation profiles of the waveguides are characterized using the recorded diffraction patterns. Index profiles are modeled by piece-wisely combining two Gaussian functions representing the central and the tail regions. Measured diffraction patterns are matched with patterns generated using the model. This simple model makes it possible to design various channel waveguides embedded into polymer substrates. The proposed model is tested on three distinctive waveguide profiles written on the same Acrylamide/Polyvinyl Alcohol based photopolymer with different exposures. 相似文献
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T. Kishii 《Optics & Laser Technology》1982,14(2):75-80
Graded-index planar optical waveguides and surface compression layers were formed simultaneously in the surface layer of glass plates by ion exchange. A change in the refractometer patterns was observed. Before ion exchange, only a critical ray fringe was observed, but with ion exchange a guided wave fringe appeared on the high effective refractive index side of the ‘critical ray’ fringe, and the number of guided wave fringes increased. The guided wave fringe or fringes were birefringent, whereas the ‘critical ray’ fringe was kept nonbirefringent. It was concluded that the ‘critical ray’ propagated along the bottom of a waveguide, ie at the foot of the refractive index distribution. 相似文献
10.
Numerical and semi-analytical techniques widely used to model the complicated structure of the radiation field excited on
sharp and smooth discontinuities of a dielectric slab are reviewed. Comparative analysis of the radiation field modelling
by the fast Fourier transformation-beam propagation method (FFT-BPM) and the finite difference(FD)-BPM is presented. Propagation of a higher-order mode through the cut-off cross-section of smooth and sharp discontinuities is
simulated numerically by the FD-BPM, the total field is analysed using the leaky mode approach. 相似文献
11.
The light intensity transmission of GaAlAs strip waveguides is sensitively dependent on the strength of the electric field inside the waveguide, when the photon energy is close to the band gap (Franz-Keldysh effect). In a waveguide embedded in a pn-junction the transmitted light itself induces the field changes through the photoelectric effect. This photo-induced Franz-Keldysh effect causes a non-linear intensity transmission of the waveguide. Light power levels far below 1 mW are sufficient to give strong non-linearities. Possible application schemes for modulation and all-optical switching in integrated optics and optoelectronics are discussed. 相似文献
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Numerical and semi-analytical techniques widely used to model the complicated structure of the radiation field excited on sharp and smooth discontinuities of a dielectric slab are reviewed. Comparative analysis of the radiation field modelling by the fast Fourier transformation-beam propagation method (FFT-BPM) and the finite difference (FD)-BPM is presented. Propagation of a higher-order mode through the cut-off cross-section of smooth and sharp discontinuities is simulated numerically by the FD-BPM, the total field is analysed using the leaky mode approach. 相似文献
14.
All-optical broadband variable optical attenuators (VOAs) and switches based on plasmonic teeth shaped waveguides have been proposed and numerically investigated. The Finite Difference Time Domain (FDTD) simulation results reveal that VOAs based on three teeth structure filled with CdSe-doped PMMA can continuously attenuate the power of a light beam from 3.7 dB to 39 dB within a broad forbidden band by an external control light. For wavelengths within the forbidden band, the structure can also operate as a switch with presence or absence of pumping light corresponding to on or off state. For a modulation depth of 27 dB, a relatively small variation in the absorption coefficient of CdSe QD-PMMA in side cavity (from κ = 0 to κ = 0.15) is enough. 相似文献
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Optical resonators are important devices that control the properties of light and manipulate light–matter interaction. Various optical resonators are designed and fabricated using different techniques. For example, in coupled resonator optical waveguides, light energy is transported to other resonators through near‐field coupling. In recent years, magnetic optical resonators based on LC resonance have been realized in several metallic microstructures. Such devices possess stronger local resonance and lower radiation loss compared with electric optical resonators. This study provides an overall introduction on the latest progress in coupled magnetic resonator optical waveguide (CMROW). Various waveguides composed of different magnetic resonators are presented and Lagrangian formalism is used to describe the CMROW. Moreover, several interesting properties of CMROWs, such as abnormal dispersions and slow‐light effects, are discussed and CMROW applications in nonlinear and quantum optics are shown. Future novel nanophotonic devices can be developed using CMROWs. 相似文献
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A. Gedeon 《Applied Physics A: Materials Science & Processing》1975,6(2):223-228
Low-loss optical waveguides have been prepared through thermally induced ion exchange, where sodium ions in glass are replaced
by silver ions from an unstirred silver nitrate melt. The index distributions of the inhomogeneous guides produced in the
glass are deduced by analysing the measured mode spectra with the WKB-method. The increase in the refractive index caused
by the presence of the silver is found to have a nearly Gaussian form with a peak of about 0.082. The index profile is correlated
to the two parameters of the preparation process, the diffusion time and the operating temperature. In a typical case (9 hrs
and 221°C) the index takes on its maximum value 2.6 μm below the surface of the glass and one obtains an 8-mode guide with
five modes buried within the glass and three modes extending to the air-glass interface.A single-mode guide is formed in less than 5 min.
The measurements yield an activation energy for the diffusion of Ag+ in glass of 8.4·104J/mole and a diffusion coefficient at 221°C of 0.67·10−12 cm2/s, in good agreement with the experimental results reported by other authors. The present observations suggest that a potential
gradient is set up in the glass when silver diffuses into it so that the silver ions drift into the glass with a velocity
of about 0.3μm/hr. 相似文献
18.
给出了Ti扩散LiNbO_3条波导任意阶导模场分布的试探解.通过变分法分析,不但可以合理地确定其中的待定参数,而且也得到了相应导模传播常数的近似值.与扩展的有效折射率方法比较:这种解不但在函数形式上简单,待定常数确定方便,而且具有精度高的优点.还可以得到等效一维波导折射率分布的解析表达式. 相似文献
19.
We present the characteristics of low-propagation-loss single-mode SiON / SiO2 / Si planar optical waveguides using plasma-enhanced chemical vapor deposition (PECVD). Using a thermal annealing process and a thick silicon dioxide buffer layer, we get an improvement on the propagation loss by the amounts of 1.24 dB /cm and 1.1 dB /cm, respectively. Optical waveguides with propagation loss lower than 0.3 dB /cm can be achieved. 相似文献
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P. Ganguly D. C. Sen S. Datt J. C. Biswas S. K. Lahiri 《Fiber and Integrated Optics》1996,15(2):135-147
A generally applicable method to simulate the two-dimensional profiles of Ti-concentration and refractive index of Ti:LiNbO3, waveguides is presented. The influence of the fabricational parameters on the refractive index profiles has been studied in detail. The model parameters are extracted from the available experimental data. The computed values of surface refractive index change agree closely with the experimental results. The model is also extended for coupled waveguides. 相似文献