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Posted: Mar 06, 2011
New research advances with surface plasmon polariton waveguides
(Nanowerk News) 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 and was highly regarded by referees. This work is done on the basis of research on surface plasmon polariton (SPP) by near-field optics technology and is the second paper published in Nano Letters in the past two months by Fang Zheyu, a Ph.D. candidate, under the guide of Professor Zhu Xing.
One of the key problems of nano-scale optical devices is how to guide and propagate incident light effectively. SPP waveguide has a long propagating distance and can transmit in metal-dielectric interface. How to enhance the coupling and transmission of SPP has attracted researchers' attention at present. Recently, Prof. Zhu Xing et al. has 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. They put 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 realize effective coupling of SPP at 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, supported by National Special Science Research Program of the Ministry of Science and Technology, National Natural Science Foundation, and State Key Laboratory for Mesoscopic Physics of PKU, is jointly completed by PKU, National Center for Nanoscience and Technology, China (NCNST), and Tübingen University.