Weekly Meeting - Dr. Yongmin Liu, "Optical Metamaterials and Transformation Optics for Light Manipulation at the Nanoscale"

  • Posted on: 8 April 2014
  • By: admin

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When: March 26th, 2014 at 11:45pm
Where: 308 Snell Engineering

This week is officer elections! All positions are open to candidates. Come cast run and/or cast your votes during the IEEE student officer elections. See attached document for officer position descriptions.

Following the elections we Dr. Yongmin Liu giving a introductory talk about Optical Metamaterials and Transformation Optics for Light Manipulation at the Nanoscale (see Abstract and below). As usual there will be pizza and drinks. See you there!

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Optical Metamaterials and Transformation Optics for Light Manipulation at the Nanoscale

Yongmin Liu
Assistant Professor
Department of Mechanical and Industrial Engineering
Department of Electrical and Computer Engineering
Northeastern University, Boston, USA
Email: y.liu@neu.edu

Website: www.northeastern.edu/liulab

Metamaterials, artificial composites with engineered structures, have emerged as an interdisciplinary area involving engineering, physics, material science and chemistry. Depending on the designed physical structures rather than the chemical constituents, metamaterials have realized extraordinary properties and functionalities beyond the reach of natural materials. Meanwhile, transformation optics, a new research area, provides a general methodology for manipulating light in a prescribed manner by tailoring the spatial distribution of materials properties. Using transformation optics and metamaterials, researchers have demonstrated a host of striking phenomena and devices, many of which were only thought possible in science fiction.

In this talk, after the introduction metamaterials and transformation optics, I will present some of our work on extreme light manipulation utilizing the two schemes. First, I will describe the design and demonstration of the first optical negative refraction in bulk metamaterials made of metallic nanowires, which exhibit low-loss, broad-band and all-angle advantages. Second, I will present an invisibility carpet cloak device, which is capable of making an object undetectable by human eyes. Finally, we apply transformation optics approach to mold near-field surface plasmon waves at the metal-dielectric interface in a prescribed manner. For instance, this approach enables surface plasmon waves to travel smoothly at uneven surfaces, where surface plasmons would normally suffer considerable scattering losses. Some plasmonic devices, such as a plasmonic bend and a plasmonic Luneburg lens, will also be presented. These results are crucial for implementing the next generation of ultra-fast and ultra-small optical circuits.

Biography

Dr. Yongmin Liu received his B.S. and M.S. degrees in Physics at Nanjing University (Nanjing, China) in 2000 and 2003, respectively. After obtaining his Ph.D. from the University of California, Berkeley in 2009, he stayed at UC Berkeley as a postdoctoral fellow for three years. In fall 2012, he joined the faculty of Northeastern University at Boston, with a joint appointment in the Department of Mechanical & Industrial Engineering and the Department of Electrical & Computer Engineering. Dr. Liu’s research interests include nano optics, nanoscale materials and engineering, plasmonics, metamaterials, biophotonics, nano optomechanics, and nonlinear and quantum optics of metallic nanostructures. He has authored and co-authored over 40 journal papers including Science, Nature, Nature Nanotechnology, Nature Communications, Physical Review Letters and Nano Letters. He currently serves as an editorial board member for Scientific Reports, a journal of Nature publishing group.

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