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A study of photonic devices based on orbital angular momentum for photonic integrated circuit
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | 김상인 | - |
| dc.contributor.author | 이인준 | - |
| dc.date.accessioned | 2022-11-29T02:33:04Z | - |
| dc.date.available | 2022-11-29T02:33:04Z | - |
| dc.date.issued | 2022-02 | - |
| dc.identifier.other | 31425 | - |
| dc.identifier.uri | https://dspace.ajou.ac.kr/handle/2018.oak/20565 | - |
| dc.description | 학위논문(박사)--아주대학교 일반대학원 :전자공학과,2022. 2 | - |
| dc.description.tableofcontents | Chapter 1: Introduction 1 Chapter 2: Integrated waveguides for OAM modes 3 2.1 Introduction 3 2.2 Waveguide for higher-order orbital angular momentum modes 4 2.2.1 Decomposition of higher-order OAM modes 4 2.2.2 Waveguide design and OAM mode analysis 7 2.2.3 Waveguide for l=±3 or l=±4 OAM modes 10 2.2.4 Fabrication scheme for the proposed waveguide 12 2.3 Conclusion 13 Chapter 3: OAM mode directional coupler for PIC 14 3.1 Introduction 14 3.2 Design principles of OAM mode directional coupler 16 3.2.1. OAM mode coupling analysis 16 3.2.2. Directional coupler design based on cross-shaped waveguide 18 3.2.3. Directional coupler simulation results and analysis 21 3.3 Conclusion 24 Chapter 4: Electro-optic OAM sign modulator 25 4.1 Introduction 25 4.2 Doping design for OAM mode modulation 25 4.3 Charge distribution simulation and OAM mode confirmation 28 4.4 OAM modulator design and verification 29 4.5 Conclusion 31 Chapter 5: Graphene plasmonic topological insulator 32 5.1 Introduction 32 5.2 Basic theories of topological insulator 33 5.2.1. Time-reversal symmetry in photonic system 33 5.2.2. Honeycomb lattice photonic crystal 33 5.3 Topological insulator based on photonic crystal 36 5.3.1. The unit cell design of graphene plasmonic topological insulator 36 5.3.2. The band structure of designed PC and band topology conversion 38 5.3.3. Topologically protected edge states 40 5.3.4. Operation frequency tuning 42 5.4 Conclusion 44 Chapter 6: Conclusion 46 6.1 Future works 46 | - |
| dc.language.iso | eng | - |
| dc.publisher | The Graduate School, Ajou University | - |
| dc.rights | 아주대학교 논문은 저작권에 의해 보호받습니다. | - |
| dc.title | A study of photonic devices based on orbital angular momentum for photonic integrated circuit | - |
| dc.type | Thesis | - |
| dc.contributor.affiliation | 아주대학교 일반대학원 | - |
| dc.contributor.alternativeName | Injoon Lee | - |
| dc.contributor.department | 일반대학원 전자공학과 | - |
| dc.date.awarded | 2022. 2 | - |
| dc.description.degree | Doctoral | - |
| dc.identifier.localId | 1244948 | - |
| dc.identifier.uci | I804:41038-000000031425 | - |
| dc.identifier.url | https://dcoll.ajou.ac.kr/dcollection/common/orgView/000000031425 | - |
| dc.subject.keyword | OAM | - |
| dc.subject.keyword | photonic integrated circuit | - |
| dc.subject.keyword | topological insulator | - |
| dc.description.alternativeAbstract | One of physical quantities of light, orbital angular momentum (OAM) has attracted great attention in various fields. Contrary to spin angular momentum (SAM), which is another angular momentum of light related to the polarization, OAM is associated with spatial distribution of electric field and has azimuthal angular dependence. The most distinguishing characteristic of OAM is its unbounded quantum number. Compare to SAM, which can have only two values: +ħ and -ħ per photon, OAM can have infinite values: lħ per photon, where l is a topological charge number which can be any integer. Since OAM carrying modes of different topological charge number are orthogonal to each other, communication system that using OAM modes has great potential to increase a transmission capacity like as mode division multiplexing technique. Also, a recently discovered state of matter, photonic topological insulator, which has OAM dependent edge states is another remarkable feature of OAM. However, due to the difficulty of OAM mode generation, propagation, and modulation, most of OAM related researches are limited to fiber, bulk, and free space optics. Since integration and miniaturization are inevitable requirement for commercial and compatible application, the investigation of OAM-based integrated photonic devices is highly required. In this thesis, several OAM-based photonic devices for integrated photonic circuit are proposed: a waveguide structure for guiding higher-order OAM mode, a OAM modulator which can switch between +l OAM mode and -l OAM mode, a OAM directional coupler, and a one-way propagation tunable photonic chip based on topological insulator. All of these devices are designed based on mode analysis and simulated through finite-difference time-domain (FDTD) method or finite element method (FEM). Also, the topological charge number of OAM modes is numerically calculated to measure the purity of OAM mode. | - |
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- Graduate School of Ajou University > Department of Electronic Engineering > 4. Theses(Ph.D)
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