[16a-WL1_201-1~11] 3.1 Basic optics and frontier of optics

10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)

[16a-WL1_201-5] Nonlinear photoluminescence from a gold nanosphere dimer excited by optical vortex beams

〇(M1)Haruki Wakita¹, Kohei Imura¹ (1.Waseda Univ.)

Keywords:

Optical vortex,Plasmonics,Nonlinear optics

We investigated nonlinear photoluminescence from gold nanosphere dimers excited by optical vortex beams. The dimer dispersed on a glass substrate was illuminated by optical vortex beams generated using a spiral phase plate with a Ti: sapphire laser. The emission spectrum exhibits second harmonic generation and two-photon–induced photoluminescence. Under the circularly polarized beam excitation the excitation image shows a bright spot at the dimer gap, whereas under the optical vortex beam excitation the image shows two bright spots around the dimer. This suggests that the excitation probability depends on the optical angular momentum of the excitation beam.