The Fall 2023 MatSE 590 for graduate students consists of an exciting and jam-packed schedule. MATSE 590 is a colloquium (1-3 credits) consist of a series of individual lectures by faculty, students, or outside speakers.
Graduate students will receive a weekly email with information via @psu.edu email. Graduate students are required to attend all 590 Seminars. If you have any questions, please email GradOffice@matse.psu.edu.
Program overview presented by Prof. John Mauro
CAPS (Counseling & Psychological Services)
September 7, 2023 - "Towards large-scale and integrated functional metasurfaces"
Xingjie Ni, Associate Professor of Electrical Engineering, Penn State
Abstract
Metasurfaces, artificially engineered ultrathin subwavelength nanostructures with exceptional light control capabilities, have the potential to revolutionize conventional optics. In the past, our group has demonstrated a variety of novel metasurface devices, from the invisibility cloak to the space-time-modulated one-way mirror. However, the traditional methods used for creating these metasurfaces, such as electron beam lithography and focused ion beam milling, are slow, expensive, and have limited scalability. To address this, we have developed a cost-effective and scalable design and fabrication method for large-scale meta-optical devices. As an example, we have built a single-lens telescope using a wafer-scale metasurface lens. Another issue with current metasurfaces is their requirement for free-space light excitation, making it difficult to integrate them on-chip. To overcome this challenge, we have designed a hybrid architecture that combines subwavelength metaphotonic structures with photonic integrated waveguide platforms. This results in a fully integrated platform with various functionalities, such as steering and focusing guided waves into free space, projecting holograms with controlled phase and amplitude, and generating laser emission with orbital angular momentum. Our findings offer a promising path towards complete control of light across integrated photonics and free-space platforms and open up new opportunities for creating multifunctional photonic integrated devices with agile access to free space.
Biographical Information
Dr. Xingjie Ni is an Associate Professor of Electrical Engineering and Materials Research Institute at the Pennsylvania State University. He joined Penn State in 2015. Prior to that, he was a postdoctoral fellow in Professor Xiang Zhang’s group at the University of California, Berkeley. He completed his Ph.D. degree in Electrical and Computer Engineering at Purdue University in 2012 under Professor Vladimir Shalaev’s supervision. He received his BS degree in Engineering Physics in 2005 and his MS degree in Automation in 2007 from Tsinghua University. Dr. Ni received the Charles H. Fetter Endowed Faculty Fellowship in 2015. He was selected as an inaugural Moore Inventor Fellow (only five fellows nationwide) in 2016. He also received NASA Early Career Faculty Award in 2017 (eight awards nationwide), Sony Faculty Innovation Award in 2018, and the 3M Non-Tenured Faculty Award in 2019. He received the National Science Foundation CAREER award in 2021. Dr. Ni’s research focus lies in nanophotonics, plasmonics, and metamaterials/metasurfaces.
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