Surface plasmon resonance with photonic band gap in high intensity laser

The 23^rd Academic Exchange Seminar Between Shanghai Jiao Tong University and Osaka University

Hikaru Tomita

(Graduated School of Engineering, Osaka University)

ABSTRACT

Surface plasmons are delocalized electron oscillations near the surface boundary and can be resonantly oscillated by using a periodic surface sutructure such as grating. When surface plasmon resonance occurs, the field intensity in the vicinity of the surface boundary can be strongly enhanced. In order to enhance the field intensity, we propose double-step grating that has two grating streuctures with different frequency. Due to the charge arrangement, the field intensity created by a doublestep-grating can be larger than by a grating. After optimizing the shape of a double-step grating by using FDTD simulation, I carried out an experiment to show the existence of surface plasmon resonance and large enhancement of local fields on a double-step grating compared with a grating.