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Title Numerical Study of Grating Coupler for Beam Steering
Publication Date
Date Accessioned
Degree MSin Engineering
Discipline/Department Automotive Systems Engineering, College of Engineering & Computer Science
Degree Level masters
University/Publisher University of Michigan
Abstract Emerging integrated photonic that studies the generation, processing, and detection of light in chip-scale optical media is one of the most important topics in modern optics research. Grating couplers have raised tremendous research interest due to its outstanding performance in compact non-mechanical beam steering, especially its potential applications in Solid State Lidar. In this work, the mechanism of one beam free-space coupling is introduced, the effects of different parameters in the grating coupler design, such as period size, number of total periods and etching depth are simulated and analyzed by FDTD method. And base on the numerical study of one beam grating coupler, we proposed a novel design of a compound period grating coupler formed by combining two grating structures with different periodicities. The new compound period grating coupler structure can couple the waveguide mode into two radiation modes with different angles. Therefore, the beam steering range is doubled due to the extra beam. We numerically demonstrate this idea, and a 26.20° steering range is observed within a wavelength tuning range of 1500 nm to 1600 nm. In addition, the investigation of fabrication tolerance shows that the new structure can be fabricated with the current CMOS technology.
Subjects/Keywords Grating coupler; Beam steering; FDTD simulation; Optical phased array; Lidar; Solid-state lidar; Electrical engineering
Contributors Yi, Yasha (advisor); Xiang, Weidong (committee member); Chakraborty, Nilay (committee member)
Language en
Rights Unrestricted
Country of Publication us
Record ID handle:2027.42/146795
Repository umich
Date Retrieved
Date Indexed 2019-08-21
Grantor University of Michigan-Dearborn
Issued Date 2018-12-15 00:00:00
Note [thesisdegreename] Master of Science in Engineering; [thesisdegreediscipline] Automotive Systems Engineering, College of Engineering & Computer Science; [thesisdegreegrantor] University of Michigan-Dearborn; [bitstreamurl] https://deepblue.lib.umich.edu/bitstream/2027.42/146795/1/Master Thesis_Wei Guo.pdf; [filedescription] Description of Master Thesis_Wei Guo.pdf : Thesis;

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…Fig. 2.2 Screenshot of one beam steering grating coupler Fig. 2.3 Screenshot of the field distribution 9 2.2 Coupling Theory Lots of research has been done in the development of grating couplers, mainly to couple light from optical fibers into…

…laser beam [10]. 2 1.2 FDTD Simulation Method Though covering all light’s technical applications over the whole spectrum, most photonic applications, such as telecommunications, optical fiber communications, laser emitting are in the range…

…we took more effort on the simulation of the grating area on the waveguide since we are more interested in its beam steering property, the light source (fundamental mode excite) is set to be 20 microns away from the coupling area which has…

…shows the screenshot of the basic model for one beam steering grating coupler in the simulation software. Different material in this model is shown in different color, blue part shows a cross-section of a silicon waveguide with the out-coupling grating…

…and waveguide parameters, chip to chip coupling and guided mode coupling are also achievable. 2.3 Tunable Parameters for Beam Steering Application We have introduced several theories in the grating coupler. From the grating equation derived above, it…

…However, for the application of solid-state Lidar, the interested out-coupling area (background) is usually air where 𝑛1 is set to be 1 in the simulation. In reality, while using OPAs as the beam steering elements in solid state Lidar…

…predicts the direction of the diffracted mode, not how much energy is in them. The out-coupling energy and beam quality are also important while applying this structure to the application of beam steering in the solid-state Lidar. We must obtain a rigorous…

…solution to Maxwell’s Equations to determine the 18 amplitude and polarization of the diffracted mode, which will be solved by the FDTD simulation software [35-36]. 19 Chapter III One beam steering 3.1 3D Simulation Results At the very…