Pub Date : 2024-09-19DOI: 10.1109/JSTQE.2024.3464530
Jinbin Yang;Meixin Feng;Xiujian Sun;Shuming Zhang;Masao Ikeda;Qian Sun;Hui Yang
AlGaN is usually used as the cladding layers for GaN-based laser diodes, but it features a low refractive index difference and large lattice mismatch with GaN, resulting in weak optical confinement and large tensile stress, and hence greatly affecting the laser performance. In response, indium tin oxide (ITO) and nanoporous GaN (NP-GaN) with low refractive indices have emerged as promising alternatives. In this study, we conducted simulations to assess the impact of the ITO and NP-GaN thicknesses on device performance through the finite-difference time-domain method. Furthermore, we investigated the influence of nanopore distribution within the NP-GaN, finding that the nanopore size and arrangement near the waveguide layer play key roles. Based on these insights, we propose a novel laser structure with ITO and NP-GaN cladding layers, achieving an 18% increase in the optical confinement factor, along with reductions of 13% in absorption loss and 14% in threshold gain compared to conventional laser diodes utilizing AlGaN cladding layers. It is of great interest to the III-nitride semiconductors and semiconductor laser communities.
氮化镓通常用作基于氮化镓的激光二极管的包层,但它与氮化镓的折射率差低、晶格失配大,导致光约束弱、拉伸应力大,从而极大地影响了激光性能。因此,具有低折射率的氧化铟锡(ITO)和纳米多孔氮化镓(NP-GaN)成为有前途的替代品。在本研究中,我们通过有限差分时域法进行了模拟,以评估 ITO 和 NP-GaN 厚度对器件性能的影响。此外,我们还研究了 NP-GaN 内纳米孔分布的影响,发现波导层附近的纳米孔大小和排列起着关键作用。基于这些见解,我们提出了一种具有 ITO 和 NP-GaN 包层的新型激光结构,与使用 AlGaN 包层的传统激光二极管相比,其光约束因子提高了 18%,吸收损耗降低了 13%,阈值增益降低了 14%。它引起了 III 族氮化物半导体和半导体激光界的极大兴趣。
{"title":"Structure Design of InGaN-Based Blue Laser Diodes With ITO and Nanoporous GaN Cladding Layers","authors":"Jinbin Yang;Meixin Feng;Xiujian Sun;Shuming Zhang;Masao Ikeda;Qian Sun;Hui Yang","doi":"10.1109/JSTQE.2024.3464530","DOIUrl":"https://doi.org/10.1109/JSTQE.2024.3464530","url":null,"abstract":"AlGaN is usually used as the cladding layers for GaN-based laser diodes, but it features a low refractive index difference and large lattice mismatch with GaN, resulting in weak optical confinement and large tensile stress, and hence greatly affecting the laser performance. In response, indium tin oxide (ITO) and nanoporous GaN (NP-GaN) with low refractive indices have emerged as promising alternatives. In this study, we conducted simulations to assess the impact of the ITO and NP-GaN thicknesses on device performance through the finite-difference time-domain method. Furthermore, we investigated the influence of nanopore distribution within the NP-GaN, finding that the nanopore size and arrangement near the waveguide layer play key roles. Based on these insights, we propose a novel laser structure with ITO and NP-GaN cladding layers, achieving an 18% increase in the optical confinement factor, along with reductions of 13% in absorption loss and 14% in threshold gain compared to conventional laser diodes utilizing AlGaN cladding layers. It is of great interest to the III-nitride semiconductors and semiconductor laser communities.","PeriodicalId":13094,"journal":{"name":"IEEE Journal of Selected Topics in Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142408974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-19DOI: 10.1109/JSTQE.2024.3463889
{"title":"Call for Papers: Advances in Neurophotonics for Monitoring Brain Function","authors":"","doi":"10.1109/JSTQE.2024.3463889","DOIUrl":"https://doi.org/10.1109/JSTQE.2024.3463889","url":null,"abstract":"","PeriodicalId":13094,"journal":{"name":"IEEE Journal of Selected Topics in Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10684412","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142313081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-19DOI: 10.1109/JSTQE.2024.3465349
Trevor J. Stirling;Bilal Janjua;Amr S. Helmy
Frequency selective structures, in particular gratings, are useful to create single-mode laser diodes, however they introduce losses which can be detrimental for many applications. A theoretical framework to design Discrete Mode Laser Diodes (DMLDs) using gratings with the lowest loss possible while still achieving single-mode operation, is developed. A version of DMLDs using surface gratings is then designed and fabricated in Bragg reflection lasers (BRLs), which support second order nonlinear conversion within the laser cavity. These DMLDs show single mode operation with $>$