Peking University, Mar. 6, 2011: On February 23, "Plasmonic Coupling of Bow Tie Antennas with Ag Nanowire" written by Fang Zheyu and his colleagues from the School of Physics at Peking University (PKU) was published in the journal Nano Letter. This artical was highly praised by referees. The study was based on research on surface plasmon polariton (SPP) by near-field optics technology. This is the second paper published in Nano Letters in the past two months by Fang Zheyu, a Ph.D. candidate, under the advisory of Professor Zhu Xing.

One of the key problems of nano-scale optical devices is attaining effective guidance and propagation incident light effectively. The SPP waveguide has a long propagating distance and can transmit through a metal-dielectric interface. At present, researchers are primarily interested in enhancing the coupling and transmission of SPP has attracted researchers' attention. Professor Zhu Xing et al. has recently found a new way to improve coupling between light and SPP and realize an enhanced SPP emission with a factor of 45 by using impedance matching theory and high-precision micro-nano processing. Members of Professor Zhu Xing's lab place bow tie nano-optical antennas at both ends of Ag nanowire with mathematical precision to realize an enhanced SPP coupling of Ag bow tie antennas. They also achieve effective coupling of SPP on the incident side of Ag nanowire by using impedance matching theory and changing the length of Ag nanowire, the arm length of bow tie antennas, and the incident angle of optical excitation, providing a new method in optical coupling and transmission of nano-scale optical devices.

This research was supported by the National Special Science Research Program of the Ministry of Science and Technology, the National Natural Science Foundation, and the State Key Laboratory for Mesoscopic Physics at PKU. It was jointly completed by PKU, the National Center for Nanoscience and Technology, China (NCNST), and Tübingen University.

Related information:
Plasmonic coupling of bow tie antennas with Ag nanowire

Translated by: Zhang Hao
Edited by: Su Juan
Source: PKU News(Chinese)