Title: Metamaterials: A Route for Molecular Scale Imaging
Dr. Nicholas X. Fang
Assistant Professor, Dept of Mechanical Science and Engineering, & the Center for Nanoscale Chemical-Electrical-Mechanical Manufacturing Systems, University of Illinois, USA

Recent theory predicted a new class of meta-materials made of artificial “atoms” and “molecules” that offer unusual optical and acoustic responses that are nonexistent in nature. For example, a theoretical “superlens” is proposed, which has potential of focusing the light far below the diffraction limit. These metamaterials could have profound impact in a wide range of applications such as real-time imaging and manipulation at molecular scale.

In this talk, I will demonstrate the progress of making these artificial metamaterials for optical and acoustic imaging purposes. We demonstrated, for the first time, the THz magnetic resonance generated by artificially structured “molecules”. Furthermore, we confirmed a key proposition of superlens theory: the recovery of evanescent waves via excitation of surface plasmons. Using silver as a natural optical superlens, we recently demonstrated sub-diffraction-limited near-field imaging with 30nm half-pitch resolution, or 1/12 of the illumination wavelength. The plasmonic structures indeed promise exciting avenues to nanoscale optical imaging and highly compact optoelectronic devices..


Nicholas Xuanlai Fang is an assistant professor of Mechanical Science and Engineering at the University of Illinois at Urbana-Champaign. He received his PhD of Mechanical Engineering in Febrary 2004, majoring MEMS/Nanotechnology from the University of California-Los Angeles (UCLA), under Professor Xiang Zhang. He also holds MS (1998) and BS (1996) degrees in Physics from Nanjing University, China. Dr. Fang is very active in the field of nanophotonics, with several key publications in Science, Nature Materials and Nanoletters. His research highlight includes first demonstration of optical superlensing, invention of far IR magnetic/plasmonic metamaterials, and development of 3D micro/ nanolithography systems. He is also interested in the design and manufacturing of photonic bandgap structures and devices, mold transfer and metallization technologies and energy and mass transport phenomena in micro- and nanoscale systems. Dr Fang is the recipient of the ASME Pi Tau Sigma Gold Medal of 2006, in recognition of his outstanding achievement in mechanical engineering. He served as a symposium co-organizer of MRS spring 2006 meeting, with focus on optical negative index materials.


主持人:黄岩谊 教授
时 间: 12月18日(周一) 上午9:30 -10:30
地 点: 北京大学廖凯原楼2号楼1层工学院会议室