Design of high extinction ratio silicon electro optic modulator based on coupled hybrid plasmonic waveguide using graphene

IF 3.3 3区 物理与天体物理 Q2 PHYSICS, CONDENSED MATTER Superlattices and Microstructures Pub Date : 2021-12-01 DOI:10.1016/j.spmi.2021.107061
Omid Abbaszadeh-Azar, Kambiz Abedi
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引用次数: 4

Abstract

In this paper, a high extinction ratio (ER) and a low power silicon-plasmonic hybrid electro-optic modulator based on graphene has been proposed and designed. The proposed modulator has three coupled waveguides, two silicon waveguides, and one hybrid plasmonic waveguide. A hybrid plasmonic waveguide has two coupled graphene layers. Two-dimensional hexagonal boron nitride (hBN) and hafnium oxide (HfO2) are used in the plasmonic waveguide. The high performance and quality modulator is obtained with this combination of materials. By electrically adjusting the graphene refractive index as low as a noble metal, the hybrid plasmonic waveguide support the high lossy surface plasmon polariton (SPPs) waves. Therefore, the propagating optical mode experiences high power attenuation. In addition, the coupling length between waveguides is changed, which causes further attenuation of light. The designed modulator has a high ER (11.01 dB/μm), wide f3dB modulation bandwidth (72.2 GHz), and low power consumption (19.36 fJ) at 1.55 μm wavelength. The finite-difference time-domain (FDTD) method is used to investigate the proposed modulator characteristics.

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基于石墨烯耦合混合等离子体波导的高消光比硅电光调制器设计
本文提出并设计了一种基于石墨烯的高消光比低功率硅-等离子体混合电光调制器。该调制器具有三个耦合波导、两个硅波导和一个混合等离子体波导。混合等离子体波导具有两个耦合的石墨烯层。二维六方氮化硼(hBN)和氧化铪(HfO2)用于等离子体波导。通过这种材料的组合,获得了高性能、高质量的调制器。通过电调节石墨烯的折射率低至贵金属,混合等离子波导支持高损耗表面等离子激元(SPPs)波。因此,传播的光模式经历高功率衰减。此外,波导之间的耦合长度发生了变化,导致光的进一步衰减。所设计的调制器在1.55 μm波长处具有高ER (11.01 dB/μm)、宽f3dB调制带宽(72.2 GHz)和低功耗(19.36 fJ)。利用时域有限差分(FDTD)方法研究了所提调制器的特性。
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来源期刊
Superlattices and Microstructures
Superlattices and Microstructures 物理-物理:凝聚态物理
CiteScore
6.10
自引率
3.20%
发文量
35
审稿时长
2.8 months
期刊介绍: Micro and Nanostructures is a journal disseminating the science and technology of micro-structures and nano-structures in materials and their devices, including individual and collective use of semiconductors, metals and insulators for the exploitation of their unique properties. The journal hosts papers dealing with fundamental and applied experimental research as well as theoretical studies. Fields of interest, including emerging ones, cover: • Novel micro and nanostructures • Nanomaterials (nanowires, nanodots, 2D materials ) and devices • Synthetic heterostructures • Plasmonics • Micro and nano-defects in materials (semiconductor, metal and insulators) • Surfaces and interfaces of thin films In addition to Research Papers, the journal aims at publishing Topical Reviews providing insights into rapidly evolving or more mature fields. Written by leading researchers in their respective fields, those articles are commissioned by the Editorial Board. Formerly known as Superlattices and Microstructures, with a 2021 IF of 3.22 and 2021 CiteScore of 5.4
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