Advanced materials for organic and hybrid polariton structures and devices

用于有机和混合极化子结构和器件的先进材料

• 批准号: 2106131
• 金额: --
• 依托单位: University of Sheffield
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2106131
• 关键词: Advanced; materials; organic; hybrid; polariton

The absorption and emission of light is fundamental to both optoelectronics and biological processes. This process usually takes place in discreet jumps, in which an excited state electron emits a photon as it returns to its ground state, or a photon is absorbed to create an excited state electron. Our growing ability to manipulate light and matter however now allows a different possibility, in which the photon and exciton are 'mixed' together, forming a type of state called a cavity-polariton. Rather than being of simple academic interest, cavity polaritons are a fascinating test-bed for fundamental physics and can have potential applications in ultra-low threshold lasers, on-chip communications elements and new types of quantum-mechanical simulator devices.Polaritons can be created in an optical structure in which a semiconductor is placed between two highly reflective mirrors. This structure traps photons into a series of discreet optical modes. Within the so-called 'strong-coupling regime' the photons trapped in the cavity can couple with the excited states of a semiconductor within the cavity and form the cavity-polaritons. In this project, the student will develop strong-coupled optical cavities that contain a range of semiconductor thin films and assess their relative lasing threshold following optical excitation. A wide range of materials will be explored, including organic semiconductor dyes and 2-dimensional perovskites, with the objective being the fabrication of polariton lasers that operate at very low thresholds. The student will be tasked with growth and fabrication of the relevant structures (including deposition of inorganic and organic materials by thermal evaporation, e-beam evaporation and spin-coating). The student will also undertake synthesis of new 2D perovskite materials and will explore means to enhance their light-emission efficiency. The student will also take a very active role in performing optical characterization of all structures fabricated using a range of laser-based spectroscopies. Our objective is to develop a new photonic platform that will be used as the basis of new low-threshold (low energy) laser devices. Together with colleagues in Southampton, we will explore the use of such devices as physical media that can be used to perform optically-driven calculations. Such systems offer the potential to be able to solve very large computational problems at high speed in a way that could not be achieved by a 'classical' computer. The Impact of such work will be in the realization of new photonic devices that are used in high-speed computation and information processing. There is also relevance for the development of emitting display technologies having enhanced efficiency, or - more speculatively - a means to change molecular pathways in chemical reactions. This may have importance in the development of a new type of 'light-driven' catalysis media.The project maps onto EPSRC Information and communication technologies ('Optoelectronic devices and circuits, Photonic materials, Quantum optics and information).The project will be performed together with colleagues at the Universities of Southampton and St. Andrews as part of the EPSRC-funded 'Hybrid Polaritonics' Programme Grant.

光的吸收和发射是光电子和生物过程的基础。这个过程通常发生在谨慎的跳跃中，其中激发的态电子在返回其基态时会发出光子，或吸收光子以创建激发态电子。然而，我们不断增长的操纵光和物质的能力现在允许不同的可能性，其中光子和激子被“混合”在一起，形成一种称为腔 - 抛物的状态。腔polartons不是一个引人入胜的测试床，是基本物理学的引人入胜的测试床，可以在超低阈值激光器，芯片通信元件和新型的量子力学模拟器设备中具有潜在的应用。可以在半径的光学结构中创建量子力学模拟器设备。该结构将光子捕获到一系列谨慎的光学模式中。在所谓的“强耦合方案”中，被困在腔体中的光子可以与腔内半导体的激发状态并形成腔孔 - 摩孔。在该项目中，学生将开发具有一系列半导体薄膜的强耦合光腔，并在光激发后评估其相对激光阈值。将探索广泛的材料，包括有机半导体染料和二维钙钛矿，其目标是制造极低阈值的极性激光器。该学生的任务是生长和制造相关结构（包括通过热蒸发，电子束蒸发和自旋涂层来沉积无机和有机材料）。该学生还将进行新的2D钙钛矿材料的合成，并将探索增强其光排放效率的手段。该学生还将在使用一系列基于激光的光谱法制造的所有结构进行光学表征中发挥非常积极的作用。我们的目标是开发一个新的光子平台，该平台将用作新的低阈值（低能）激光器设备的基础。与南安普敦的同事一起，我们将探讨可用于执行光学驱动计算的物理媒体等设备。这样的系统提供了能够以“古典”计算机无法实现的方式以高速解决非常大的计算问题的潜力。这种工作的影响将是实现在高速计算和信息处理中使用的新光子设备。与开发具有提高效率的显示技术的发展，或者 - 更具投机性的一种改变化学反应中分子途径的方法。这可能在开发一种新型的“光驱动”催化媒体的开发中很重要。