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Colloquium Series: Dr. Yin Liu, NC State University

Tuesday, November 19 @ 4:00 pm - 5:00 pm


Dr. Yin Liu
Assistant Professor of Material Science and Engineering
NC State University
Title: Highly confined, Low-loss infrared phonon polaritons in Perovskite Oxide Membranes
Abstract:
Phonon polaritons (PhPs) are hybrid optical modes resulting from the coupling of photons with optical phonons. Their capability to compress light wavelengths and enhance optical fields at the nanoscale has enabled a range of applications in nanophotonics, including optical sensing, perfect absorption, superlensing, and coherent thermal emission. However, the polaritonic materials examined to date have predominantly been van der Waals 2D materials, such as hBN and MoO3. These materials are typically available as exfoliated flakes, which present challenges in achieving consistent lateral size and thickness, thereby limiting their scalability and integration into devices. Furthermore, they primarily operate in the mid-infrared range, constraining their use in the far-infrared/terahertz domain for applications in terahertz optoelectronics and thermal management. To overcome these material limitations, it is essential to explore high-quality, scalable alternatives that can support low-loss and tunable PhPs in the far-infrared range. Our research reveals low-loss, tunable far-infrared PhPs in freestanding complex oxide membranes, utilizing near-field synchrotron infrared nanospectroscopy. This work highlights the significant potential of transition-metal oxide membranes as a scalable materials platform for future terahertz nanophotonics.
Bio:
Yin Liu is an Assistant Professor of Materials Science and Engineering at North Carolina State University. His research group, the Liu Research Group, specializes in the growth, characterization, and device fabrication of low-dimensional (1D and 2D) materials. The group is particularly focused on employing TEM imaging and spectroscopy, as well as optical spectroscopy, to investigate the nanoscale optoelectronic and quantum-optical properties of nanomaterials. Prior to joining the faculty at NCSU, Yin earned his PhD in Materials from the University of California Berkeley and completed postdoctoral research at Stanford University. He has authored and co-authored over 40 journal articles, including publications in journals such as Nature, Nature Communications, Chemical Reviews, and Nano Letters. Yin has received several accolades, including the NSF CAREER Award (2024), the MRS Graduate Student Gold Award (2019), and the Chinese Government Award for Outstanding Students Abroad (2019).

Details

Date:
Tuesday, November 19
Time:
4:00 pm - 5:00 pm

Venue

Chapman Hall, Room 125
205 S Columbia St
Chapel Hill, NC 27514 United States
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