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Amplitude-only nanohole metasurface holography

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目录

声明

1 Introduction

1.1 Introduction

1.2 Background of the Study

1.3 Amplitude-Only Holograms

1.4 Statement of the Study Problem

1.5 Significance of Research

1.6 Research Questions

1.7 Research Objectives

1.8 Thesis overview

2 Methodology

2.1 Introduction

2.2 Literature review

2.2.1 Metasurfaces

2.2.2 Nanohole Background

2.2.3 Surface Plasmon

2.3 Nanohole Amplitude-Only Metasurface Holography Procedure

2.4 Design and simulations

2.4.1 Mathematical Model

2.4.2 MATLAB

2.4.3 Lumerical FDTD

2.5 Fabrication

2.5.1 Electron Beam Lithography (EBL)

2.6 Characterization

2.6.1 Experimental Setup

2.6.2 Scanning Electron Microscopy

3 Design simulation and optimization

3.1 Introduction

3.2 Theoretical Background

3.2.1 Diffraction theories

3.2.2 Maxwell Equation

3.2.3 Maxwell’s equation solution

3.3 Overview of lumerical FDTD tools for simulation

3.3.1 Material

3.3.2 Simulation object

3.3.3 Structures

3.3.4 Groups

3.3.5 Attributes

3.3.6 Simulation

3.3.7 Import

3.3.8 Sources

3.3.9 Monitors

3.3.10 Optimizations and sweeps

3.3.11 Result analysis

3.3.11 Analysis groups

3.4 Design of Amplitude-Only Nanohole Metasurface

3.4.1 Design Process

3.4.2 Nanohole Design

3.3.4 Fraunhofer diffraction

3.4.5 Encoding of Design

3.4.6 FDTD Model Development

3.5 Results

4 Fabrication

4.1 Introduction

4.2 Theoretical Background

4.3 Clean room/Nanofabrication laboratory

4.3.1 Clean room suit

4.4 Silicon Wafer Substrate

4.5 Sample preparation

4.5.1 Spinning and coating resist

4.6 Fabrication Technique

4.6.1 EBL

4.6.2 Components of EBL

4.6.3 Etching

4.6.4 Metal Deposition and Lift-off

4.6.4 Thermal Evaporation

5 Conclusion

参考文献

Appendix A: Standard Operating Procedure: EBL

Appendix B:

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摘要

作为出色的全息信息载体,超表面全息图具有亚波长像素的优势,从而带来了广阔的视角和更高的分辨率。同时,应该开发智能算法以充分利用超颖表面提供的灵活调制特性。在此,使用纳米孔超表面作为振幅调制装置来实现振幅全息图。采用GS算法来获得对象“A”的幅值型全息图,只需添加/删除动态像素,即可使两个轮廓相互连接。设计了由纳米孔阵列组成的幅度型超表面,以证明该方案的可行性。这种幅度全息方法可以在可见光波长范围内偏振独立地工作,并且随着材料科学的发展,有望得到进一步的改进。这种方案有望应用于紧凑型数据存储,双模式识别,光学加密等。

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