L. Jay Guo

L. Jay Guo, Professor, University of Michigan

L. Jay Guo

Biography:

L. Jay Guo started his academic career at the University of Michigan in 1999, and has been a professor of Electrical Engineering and Computer Science since 2011, with joint appointment in Applied Physics, Mechanical Engineering, Macomolecular Science and Engineering. He has > 200 refereed journal publications with over 20,000 citations, 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 and nanophotonics, nanoimprint-based and roll to roll nanomanufacturing technologies.

  

Invited talk:

 

Recent development and applications of nanoimprint technology

 

Nanoimprinting has been applied in many micro- and nanoscale engineered devices; applications include displays, organic electronics, photovoltaics, optical films, and optoelectronics; and in some cases, direct imprinting of functional polymeric devices. Applications in the photonics area can significantly relieve the stringent requirement needed for nanoelectronics. We provide examples of structural colors and optical meta-surfaces facilitated by nanoimprinting, as well as plasmonic lithography masks that can produce deep-subwavelength structures using ordinary UV light.

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 provide a high precision additive manufacturing process. We will show printed photonic devices, e.g. electro-optic polymer based optical modulators.

To extend nanoimprinting to solid materials other than polymeric films will require innovative and non-conventional approach. One such process is Metal-assisted chemical (Mac) imprint, which combines MacEtch and nanoiprint and enables direct MacEtch of Si substrate using a hybrid imprinting mold having noble metal mask. However, only low aspect ratio structures have been obtained because of the mass-transport limitation in the previous molds. Recently we effectively solved this problem by a using a specially made mold of Pt-coated anodized aluminum oxide (AAO) membrane, where the holes through the entire thickness drastically enhances the mass-transport. As a result, high aspect ratio (~1:50) Si nanowires were achieved by MacImprint.