CAREER: Towards Control of Photo-Induced Charges in Chiral Nanocomposites via Optical Spin-Orbit Interactions

职业：通过光学自旋轨道相互作用控制手性纳米复合材料中的光生电荷

• 批准号: 1921025
• 负责人: Luat Vuong
• 金额: $ 2.27万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-27 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1921025&HistoricalAwards=false
• 关键词: CAREER; Towards; Control; Photo; Induced

Technical: The research component of this CAREER award aims to understand the photo-induced electrical energy flows in chiral nanocomposite materials where nonlinear optical phenomena are observed at unprecedented low light intensities (1 W/cm^2) stemming from the appreciable photo-induced magnetic fields and the interactions between nanoparticles. These effects, associated with optical spin-orbit interactions, are theoretically underestimated and not well understood; refining numerical models so that they properly estimate the measured intensity-dependent and polarization-dependent processes is a priority in this project. Samples of partially-metal-coated dielectric nanospheres are subsumed in transparent conducting polymers and assembled electrophoretically and with external magnetic-field processing techniques. Scattering, transient absorption, electrical, and magnetic field measurements characterize the modified nanoparticle alignment and the low-frequency charge transport that occurs in the surrounding conducting polymer.Non-technical: The project addresses basic research issues in a topical area of materials science with technological relevancy. Nanocomposite materials provide a platform for new optoelectronics, solar harvesting, and photocatalysis applications. The educational activities of this project are designed to attract, train, and retain creative, resourceful students of all backgrounds, with special emphasis on those attending public schools in the outer New York boroughs of Queens and the Bronx. Research opportunities for highly motivated pre-college students, professional Master's students, and international collaborators address the need for scientific training prior to and outside of a doctoral program.

技术：该职业奖的研究部分旨在了解手性纳米复合材料中的光致电能流，在前所未有的低光强度 (1 W/cm^2) 下观察到非线性光学现象，这些现象源于明显的光致磁力场和纳米颗粒之间的相互作用。这些与光学自旋轨道相互作用相关的效应在理论上被低估并且未被充分理解；完善数值模型，以便正确估计测量的强度相关和偏振相关过程是该项目的首要任务。部分金属涂覆的介电纳米球样品被包含在透明导电聚合物中，并通过电泳和外部磁场处理技术进行组装。散射、瞬态吸收、电场和磁场测量表征了改进的纳米颗粒排列和周围导电聚合物中发生的低频电荷传输。非技术性：该项目通过技术解决了材料科学主题领域的基础研究问题。关联。纳米复合材料为新型光电、太阳能收集和光催化应用提供了平台。该项目的教育活动旨在吸引、培训和留住各种背景、富有创造力、足智多谋的学生，特别关注那些在纽约外城区皇后区和布朗克斯区公立学校就读的学生。为积极主动的预科生、专业硕士生和国际合作者提供的研究机会满足了博士课程之前和之外的科学培训需求。