题目：Additive Process for Photonics by Combining Nanoimprint and Inkjet Printing

报告人：L. Jay Guo（郭凌杰）

时间：2017年8月24日 上午10:30 

地点：动力与机械学院报告厅

欢迎广大师生踊跃参加！

About the lecturer：

L. Jay Guo started his academic career at the University of Michigan in 1999, and has been a full professor of Electrical Engineering and Computer Science since 2011, and with affiliations in Applied Physics, Mechanical Engineering, Macomolecular Science and Engineering. He has over 200 refereed journal publications with over 27,000 citations (and h-index of 65), and close to 20 US patents. Many published work from his lab have been featured by numerous media. He is the recipient of the Research Excellence Award from the College of Engineering, and Outstanding Achievement Award in EECS at the University of Michigan. His group’s researches include polymer-based photonic devices and sensor applications, hybrid photovoltaics, plasmonic nanophotonics, nanoimprint-based and roll to roll nanomanufacturing technologies.

Abstract：

Nanoimprint Lithography was originally developed to address the needs to fabricate high density magnetic storage and nanoelectronic circuitry, and can pattern feature size beyond the light diffraction limit in the UV photolithography. The extreme-low defectivity requirement of these applications has presented great challenges for the deployment of the technology. On the other hand, many other applications that require the precise feature control can benefit from such low-cost patterning technology, especially with the continuous roll to roll nanoimprint. Indeed Nanoimprinting has been applied in many nanoscale engineered devices; applications include displays, organic electronics, photovoltaics, optical films, and optoelectronics; and in some cases, direct imprinting of functional polymeric devices. Inkjet printing has been widely used in many applications, but still faces challenges in pattern precision and feature variations. Combining Nanoimprint for patterning and inkjet printing for material deposition will take the advantage of what both technologies can offer, and can enable high precision additive manufacturing process. We will show printed photonic devices, e.g. electro-optic polymer based optical modulators. To allow different types of inks to be used, especially those high viscosity ones that can easily clog the inkjet nozzle, we also propose and demonstrate a nozzle-free printing process enabled by high-frequency focused ultrasound.