Influence of thermal growth of Au nanoparticles in the coupling efficiency of Au/SiO2 nanocomposite grating coupler

2021 ◽  
Author(s):  
Gang Wang ◽  
Jun Wang ◽  
Hai Tao Dai ◽  
Changlong Liu
Keyword(s):  
Au Nanoparticles ◽  
Coupling Efficiency ◽  
Grating Coupler ◽  
Thermal Growth

Bottom to in-plane grating coupler with high coupling efficiency and directionality

2019 ◽  
Author(s):  
Yixin Chen ◽  
Bin Ai ◽  
Elham Heidari ◽  
Bonnie J. Dunbar ◽  
Volker J. Sorger ◽  
...  
Keyword(s):  
Coupling Efficiency ◽  
Grating Coupler

scholarly journals Comparison of Fiber-to-Waveguide Couplers in Point Diffraction Interferometer Based on Waveguide Reference Wavefront Source

2020 ◽  
Vol 10 (24) ◽  
pp. 9115
Author(s):  
Yuankai Chen ◽  
Jian Bai ◽  
Chen Wang ◽  
Yingze Xue ◽  
Yongying Yang
Keyword(s):  
Silicon Nitride ◽  
Coupling Efficiency ◽  
Maximum Efficiency ◽  
Grating Coupler ◽  
Polarization Dependent Loss ◽  
Te Mode ◽  
Fabrication Tolerance

To improve the power of reference wavefront generated by reference wavefront source (RWS) based on silicon nitride (SiN) waveguide in point diffraction interferometer (PDI), we design the Y-branch coupler and grating coupler, and then compare the maximum coupling efficiency, 3 dB fabrication tolerance, 3 dB alignment tolerance and polarization dependent loss of two couplers. Our results show that grating coupler has higher coupling efficiency, lower etching difficulty and alignment difficulty, while Y-branch coupler has lower coating difficulty. To get the maximum efficiency, mode in the fiber must be TE mode no matter for grating coupler or Y-branch coupler. This paper improves the power of the wavefront by selecting appropriate fiber-to-waveguide couplers for waveguide RWS. PDI based on the power improved waveguide RWS is expected to be used in many measurement fields.

Analysis of Coupling Efficiency of Nano Grating Coupler Based on InP Material

2014 ◽  
Vol 20 (4) ◽  
pp. 337-341
Author(s):  
刘耀英 LIU Yao-ying ◽  
薛晨阳 XUE Chen-yang ◽  
崔晓文 CUI Xiao-wen ◽  
崔丹凤 CUI Dan-feng ◽  
韦丽萍 WEI Li-ping ◽  
...  
Keyword(s):  
Coupling Efficiency ◽  
Grating Coupler

scholarly journals Efficiency Enhanced Grating Coupler for Perfectly Vertical Fiber-to-Chip Coupling

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2681 ◽  
Author(s):  
Zan Zhang ◽  
Xiaotao Shan ◽  
Beiju Huang ◽  
Zanyun Zhang ◽  
Chuantong Cheng ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Coupling Efficiency ◽  
Optical Power ◽  
Wide Band ◽  
Cost Effective ◽  
Grating Coupler ◽  
Wavelength Division ◽  
Si3n4 Layer ◽  
Vertical Coupling ◽  
193 Nm

In this work, a bidirectional grating coupler for perfectly vertical coupling is proposed. The coupling efficiency is enhanced using a silicon nitride (Si3N4) layer above a uniform grating. In the presence of Si3N4 layer, the back-reflected optical power into the fiber is diminished and coupling into the waveguide is increased. Genetic algorithm (GA) is used to optimize the grating and Si3N4 layer simultaneously. The optimal design obtained from GA shows that the average in-plane coupling efficiency is enhanced from about 57.5% (−2.5 dB) to 68.5% (−1.65 dB), meanwhile the average back-reflection in the C band is reduced from 17.6% (−7.5 dB) to 7.4% (−11.3 dB). With the help of a backside metal mirror, the average coupling efficiency and peak coupling efficiency are further increased to 87% (−0.6 dB) and 89.4% (−0.49 dB). The minimum feature size of the designed device is 266 nm, which makes our design easy to fabricate through 193 nm deep-UV lithography and lowers the fabrication cost. In addition, the coupler proposed here shows a wide-band character with a 1-dB bandwidth of 64 nm and 3-dB bandwidth of 96 nm. Such a grating coupler design can provide an efficient and cost-effective solution for vertical fiber-to-chip optical coupling of a Wavelength Division Multiplexing (WDM) application.

scholarly journals Fully etched apodized grating coupler on the SOI platform with −058  dB coupling efficiency

2014 ◽  
Vol 39 (18) ◽  
pp. 5348 ◽  
Author(s):  
Yunhong Ding ◽  
Christophe Peucheret ◽  
Haiyan Ou ◽  
Kresten Yvind
Keyword(s):  
Coupling Efficiency ◽  
Grating Coupler

scholarly journals Vertical Injection and Wideband Grating Coupler Based on Asymmetric Grating Trenches

2021 ◽  
Author(s):  
Md Asaduzzaman ◽  
Robert J. Chapman ◽  
Brett C. Johnson ◽  
Alberto Peruzzo
Keyword(s):  
Fdtd Method ◽  
Coupling Efficiency ◽  
Silicon On Insulator ◽  
Subwavelength Structures ◽  
Grating Coupler ◽  
Subwavelength Gratings ◽  
Vertical Injection ◽  
Index Variation ◽  
2D Fdtd ◽  
Difference Time

Abstract A Silicon-on-insulator (SOI) perfectly vertical fibre-to-chip grating coupler is proposed and designed based on engineered subwavelength structures. The high directionality of the coupler is achieved by implementing step gratings to realize asymmetric diffraction and by applying effective index variation with auxiliary ultra-subwavelength gratings. The proposed structure is numerically analysed by using two-dimensional Finite Difference Time Domain (2D FDTD) method and achieves 76% (-1.19 dB) coupling efficiency and 39 nm 1-dB bandwidth.

scholarly journals Multiple Layers of Silicon-Silica (Si-SiO2) Pair onto Silicon Substrate towards Highly Efficient, Wideband Silicon Photonic Grating Coupler

2016 ◽  
Author(s):  
Md Asaduzzaman ◽  
Masuduzzaman Bakaul ◽  
Stan Skafidas ◽  
Md Rezwanul Haque Khandokar
Keyword(s):  
Coupling Efficiency ◽  
Single Mode ◽  
Guided Wave ◽  
Grating Coupler ◽  
Si Substrate ◽  
Constructive Interference ◽  
Reflected Waves ◽  
Waveguide Grating ◽  
Silicon Photonic ◽  
Difference Time

A single mode waveguide grating coupler based on multiple Si-SiO2 pairs onto Si substrate has been designed. Numerical analysis has been carried out to calculate optimum thickness of the layers of Si-SiO2 that ensures the constructive interference between reflected waves and actual guided wave for high coupling efficiency. Based on the results, an optimal design is developed and modeled by using a 2-D finite difference time domain (2-D FDTD) simulator that dictates a coupling efficiency of as much as 78% (-1.07 dB) at the wavelength of 1550 nm, and a 1-dB bandwidth of 77 nm. The numerical method will be useful to calculate the optimum thicknesses of the layers for any reflector based grating coupler of different materials.

scholarly journals Wide bandwidth and high coupling efficiency Si_3N_4-on-SOI dual-level grating coupler

2014 ◽  
Vol 22 (9) ◽  
pp. 10938 ◽  
Author(s):  
Wesley D. Sacher ◽  
Ying Huang ◽  
Liang Ding ◽  
Benjamin J. F. Taylor ◽  
Hasitha Jayatilleka ◽  
...  
Keyword(s):  
Coupling Efficiency ◽  
Grating Coupler ◽  
Wide Bandwidth
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