[18a-Z06-1~11] 3.6 Ultrashort-pulse and high-intensity lasers

△ [18a-Z06-1] Excitation of surface plasmon polaritons on Si transiently metalized by intense femtosecond laser pulse

〇(M2)Mika Tateda¹, Yuto Iida¹, Godai Miyaji¹ (1.Tokyo Univ. of A. & T.)

Keywords:surface plasmon, femtosecond laser, silicon

We have observed that a low-fluence femtosecond (fs) laser pulse can transiently excite surface plasmon polaritons (SPPs) on a silicon grating metalized by the intense fs laser pulse. The experimental results obtained clearly show that SPP wavelength, propagation length, and amplitude can be changed by the laser fluence and time difference between two beams, and that they have optimum for its strong excitation.