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Novel semiconductor laser devices and systems featuring in-plane periodic optical nanostructures for quantum, biomedical, imaging and telecommunicatio

用于量子、生物医学、成像和电信的新型半导体激光器件和系统，具有面内周期性光学纳米结构

基本信息

批准号：
1944303
负责人：
金额：
--
依托单位：
University of Glasgow
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2017
资助国家：
英国
起止时间：
2017 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1944303
关键词：
Novel semiconductor laser devices systems

项目摘要

The aim of this research project is to conduct design and characterization of multiple types of novel semiconductor lasers in visible and near-infrared wavelength ranges and achieve their successful implementation and evaluation within facilities of the James Watt Nanofabrication Centre, University of Glasgow, as well as those of collaborating entities (National Physical Laboratory, UK; Compound Semiconductor Technology Global, Ltd., UK; etc.).The laser diodes in question are state-of-the-art optoelectronic semiconductor devices implemented in AlGaAs and AlInGaAsP material systems, making use of one- and two-dimensional periodic optical nanostructures (Bragg gratings, photonic crystals) distributed in-plane in combination with advanced fabrication techniques (electron beam nanolithography, epitaxial regrowth) in order to achieve necessary level of performance or/and provide unconventional useful properties to the laser emission.One of the main goals of the project involves achievement of distributed feedback lasers (DFBs) within 680-710nm wavelength window for application in novel strontium-based optical lattice atomic clocks currently developed in many research institutions around the world. DFB laser devices in these wavelengths have never been demonstrated before, and their utility is becoming more and more evident as strontium lattice clocks are continuously pushing boundaries of time-measurement precision, to the extent of making it possible to redefine the SI second. Opportunity to replace large, heavy and expensive laboratory-grade external cavity lasers in these setups with high-fidelity all-semiconductor DFBs would dramatically widen the range of potential applications for strontium lattice clocks to include aerospace, telecommunication, scientific, and many other fields currently deterred by weight, cost and/or experimental nature of the existing systems.In this regard, the project is focused on implementation of every single step in fabrication of these DFB devices, including design, simulation, optimisation and growth of epitaxial material, design and nanolithographic definition of distributed Bragg structures as well as epitaxial regrowth by the means of metal-oxide vapour-phase epitaxy (MOVPE) in the University-owned reactor. In collaboration with the National Physical Laboratory, UK, fitness-for-purpose of the resulting devices will be evaluated inside an actual strontium clock setup.Another part of this research project considers design, fabrication and optimisation of the photonic-crystal surface-emitting laser (PCSEL), investigation and description of its unique optical properties and proposal of potential applications for such devices in fields including biomedical imaging and sensing, telecommunications, all-optical signal processing, etc.PCSEL is a relatively new type of semiconductor laser structure, so far with only a few research groups around the world focusing their research on these devices. It implements a distributed Bragg lattice (photonic crystal) in order to establish in-plane optical feedback in two dimensions as well as extract light from the laser cavity via second-order Bragg scattering. This results in broad area single-mode emission, a unique property not achieved by any other semiconductor laser structure, and hence naturally low beam divergence. 2D in-plane feedback in these devices allows for their integration into coherently coupled arrays for power scaling and opens potential for optical intermodulation for telecommunication applications and solid-state beam steering for LIDAR, imaging and laser scanning.

该研究项目的目的是进行可见光和近红外波长范围内多种类型的新型半导体激光器的设计和表征，并在格拉斯哥大学詹姆斯瓦特纳米纤维中心以及合作实体（英国国家物理实验室;化合物半导体技术全球有限公司，UK等）。所讨论的激光二极管是在AlGaAs和AlInGaAsP材料系统中实现的最先进的光电半导体器件，利用一维和二维周期性光学纳米结构（布拉格光栅，光子晶体）分布在平面内结合先进的制造技术（电子束纳米光刻，外延再生长），以便实现必要的性能水平，或者/该项目的主要目标之一是在680- 1000 nm范围内实现分布式反馈激光器（DFB）。710 nm波长窗口，用于目前世界上许多研究机构开发的新型锶基光学晶格原子钟。这些波长的DFB激光器以前从未被证明过，随着锶晶格时钟不断突破时间测量精度的界限，其实用性变得越来越明显，以至于有可能重新定义SI秒。用高保真全半导体DFB取代这些装置中的大、重且昂贵的实验室级外腔激光器的机会将极大地拓宽锶晶格时钟的潜在应用范围，以包括航空航天、电信、科学和目前受现有系统的重量、成本和/或实验性质阻碍的许多其他领域。该项目的重点是实现这些DFB器件制造过程中的每一个步骤，包括设计、模拟、优化和外延材料的生长，分布式布拉格结构的设计和纳米光刻定义，以及通过金属氧化物气相外延（MOVPE）在大学的外延再生长-拥有的反应堆。与英国国家物理实验室合作，将在实际的锶钟设置中评估所产生的器件的适用性。该研究项目的另一部分考虑光子晶体表面发射激光器（PCSEL）的设计，制造和优化，研究和描述了其独特的光学性质，并提出了此类器件在生物医学成像和传感、电信、全光信号处理等。PCSEL是一种相对新型的半导体激光器结构，迄今为止，全世界只有少数研究小组专注于这些器件的研究。它实现了分布式布拉格晶格（光子晶体），以便在两个维度上建立面内光学反馈，并通过二阶布拉格散射从激光腔中提取光。这导致宽面积单模发射，这是任何其他半导体激光器结构都无法实现的独特特性，因此自然具有低光束发散度。这些器件中的2D面内反馈允许它们集成到相干耦合阵列中以进行功率缩放，并为电信应用的光互调和用于LIDAR、成像和激光扫描的固态光束转向开辟了潜力。