NBC Seminar Plasmonic Biosensor and System Speaker HyeonBong

NBC Seminar Plasmonic Biosensor and System Speaker Hyeon-Bong Pyo, Ph. D Electronics and Telecommunications Research Institute (ETRI) Surface plasmon is a coherent, collective oscillation of free electrons on a metal surface. Plasmon mode absorbs light energy selectively, according to the dielectric properties of ambient, shape, size of metal structure, and the wavelength and/or angle of incident light. The plasmon mode can be divided in the following manner: 3 D-plasmon (bulk plasmon), 2 D-plasmon, 1 DPlasmon, 0 D-plasmon (particle plasmon or localized surface plasmon). A traditional way of coupling light with plasmon mode, which has been employed mainly in surface physics and in biosensor applications, is 2 Dplasmon mode. (“Kretschmann-Raether” configuration: a plasmon-supporting metal layer on top of a prism/grating coupler. ). Other type of plasmon modes, in which the metal nano-structure is locally confined and plays like a “lightening rod” is called “localized” surface plasmon. In this case, the external light is coupled with plasmons in metal nanostructure resonantly, exhibiting a strong color as can be seen in a gold colloidal solution (ruby-red). In this talk, optical and physical properties of 2 D- and 0 D-plasmon mode and its applications to the biosensor developments will be discussed, and the results are presented. Optically important design parameters in manufacturing the nanostructures will be figured out, and possible applications of optical properties of metal nanostructures will be revisited. When: 4: 15 PM on Mar. 24 (Thu. ) Where: Engineering Building 1, E 104 Contact: Prof. Yoon-Kyoung Cho(2511) / ykcho@unist. ac. kr School of Nano-Bioscience & Chemical Engineering UNIST