GOALI:Tradeoffs in Heat Dissipation and Optical Performance at Plasmonic Interfaces

CBET-1403447马伦卡内基-梅隆大学(CMU)和希捷科技的合作伙伴关系使这项研究直接适用于数据存储行业的新技术开发。下一代高密度存储将由激光激励的近场换能器(NFT)实现，这种换能器将电磁能量集中到热激活的纳米级磁性比特上。在NFT的功能端，太阳表面的热通量超过100倍可能会导致运行温度过高。类似的限制在用于化学催化、生物传感和蒸汽产生的等离子体中普遍存在。此外，拟议的界面温度原位测量将使等离子体结构的测量成为可能，并代表着朝着近场热反射比测量迈出的一步。教育活动将通过课程开发、客座讲座和研讨会以及希捷潜在的实习机会，让学生接触到行业驱动的学术研究。反过来，希捷将通过将研究主题和结果整合到学术绩效指标教授的课程中，在CMU获得曝光率。该方案的技术目标是通过实验研究纳米级粘附层修饰的等离子体界面上的散热和光学性能之间的权衡。这个跨学科的研究小组将研究具有金属粘结层的金属-介质界面中等离子体共振、电子-声子耦合和声子传输的性质。悬而未决的科学问题包括：粘附层如何影响金属-电介质界面上的声子传输和界面上的等离子体共振的物理特性？等离子体共振的温度依赖性能用于现场测量界面温度和热物性吗？为了回答这些问题，这项研究将研究典型的Au/SiO_2和Au/AlN等离子体子界面中的输运，它们与铜、钛、铝、铬和铍的粘附层在1-5 nm范围内作为厚度的函数。相对于Au，这些金属依次具有更好的电声子耦合和与介质的振动对准。薄膜样品将被溅射并用透射电子显微镜成像。热界面电导将使用两种独立的泵浦-探测热反射技术来测量。将用近场扫描光学显微镜测量含有粘附层的波导中的等离子体响应。一种新颖的原位泵浦-探测测量金属-介质界面的热性质和温度将被开发出来。

CBET-1403447MalenThe GOALI partnership between Carnegie-Melon University (CMU) and and Seagate Technology makes the research directly applicable to development of new technologies in the data storage industry. The next generation of high-density storage will be enabled by laser-excited near field transducers (NFTs) that focus electromagnetic energy onto thermally-activated nanometer-scale magnetic bits. Heat fluxes in excess of 100 times that present at the sun's surface at the functional end of an NFT can result in excessive operating temperatures. Similar limitations pervade plasmonics used for chemical catalysis, bio-sensing, and steam generation. Further, the proposed in-situ measurement of the interface temperature will enable entirely new metrology of plasmonic structures, and represents a step towards near field thermoreflectance metrology. The educational activities will expose students to industry-driven academic research through curriculum development, guest lectures and seminars, and potential internships at Seagate. Seagate, in turn, will receive exposure at CMU through integration of the research topics and results within courses taught by the academic PIs. The technical objective of this GOALI proposal is to experimentally study tradeoffs in heat dissipation and optical performance at plasmonic interfaces modified by nanoscale adhesion layers. The interdisciplinary research team will study the nature of plasmonic resonance, electron-phonon coupling, and phonon transmission in metal-dielectric interfaces with metal adhesion layers. Open scientific questions include: how do adhesion layers influence the physics of phonon transmission across a metal-dielectric interface and plasmonic resonance at the interface? Can the temperature dependence of plasmonic resonance be used to make in-situ measurements of interface temperature and thermal properties? To answer these questions, the research will investigate transport in prototypical Au/SiO2 and Au/AlN plasmonic interfaces with Cu, Ti, Al, Cr, and Be adhesion layers as a function of thickness from 1-5 nm. Relative to Au, these metals have successively better electron-phonon coupling and vibrational alignment with the dielectrics. Thin film samples will be sputtered and imaged by TEM. Thermal interface conductance will be measured using two independent pump-probe thermoreflectance techniques. Plasmonic response in waveguides incorporating the adhesion layers will be measured with near-field scanning optical microscopy. A novel in-situ pump-probe measurement of the thermal properties and temperature of the metal-dielectric interface will be developed.