Special Seminar Takasumi Tanabe Associate Professor at Keio University, Japan Optical nonlinear control at a very low power in ultrahigh-Q microcavity systems Wednesday, March 9, 2016 @ 11:00 am Cruft 309 *Light refreshments will be served* Ultrahigh-Q microcavities are attracting attention because they enable strong interaction between light and matter. Among various microcavities, photonic crystal nanocavity and toroid microcavity exhibit the highest Q/V, where V is the mode volume of the cavity. In the first half of my talk, I will discuss on our recent work on CMOS compatible fabrication of high-Q photonic crystal nanocavity and a tapered-fiber assisted reconfigurable cavity system that have extremely high coupling efficiency. In the second half of my talk, I will share some of our recent results on the Kerr comb generation in a high-Q toroidal microcavity system. I will discuss how the CW/CCW mode coupling and opto-mechanical coupling will affets the stability of the generated combs. I also discuss on the interplay between the Raman scattering and four-wave mixing effect in such small cavity system made by SiO2 Biography: Takasumi Tanabe received his Ph.D. from Keio University, Japan in 2004, where he studied adaptive shaping of amplified femtosecond pulses. On 2004, he joined NTT Basic Research Laboratories, Japan, where he started research on two-dimentional photonic crystal nanocavity systems. On April 2010 he moved to Electronics and Electrical Engineering in Keio University where he is currently an associate professor. He received Scientific American 50 Award in 2007, and the Commendation for Science and Technology (The Young Scientists’ Prize) by the Minister of Education, Culture, Sports, Science and Technology, Japan, in 2010. Dr. Tanabe has published more than 50 papers (h-index: 25) and delivered a number of post-deadline talks and invited talks in conferences such as CLEO and SPIE Photonics West. He is currently serving as an Associate Editor for AIP Advances. Harvard John A. Paulson School of Engineering and Applied Sciences Pierce Hall, 29 Oxford Street Cambridge, MA 02138 P: 617.496.1460 | E: rstiles@seas.harvard.edu<mailto:rstiles@seas.harvard.edu>