The following seminar will be held.
Date and Time: November 7, 2025 (Fri.) 15:00-16:00
Venue:340, Building 1, Faculty of Science, The University of Tokyo
Speaker: Kiyoul Yang (Assistant Professor, Harvard University)
Title: Bridging nonlinear photonics, solid-state gain, and computational optimization
We are curious to combine coupling between optical modes?across both spectral and spatial domains?with optically active gain on integrated photonic platforms. Our goal is to translate these processes, traditionally realized infree-space or fiber-based systems, onto integrated photonics. By embedding them within nanophotonic structures whose dimensions approach the optical wavelength, we can rigorously re-examine their behavior in a regime where confinement, dispersion, and material nonlinearities interact in fundamentally new ways.
In this presentation, we will discuss recent progress in integrated solid-state gain and nonlinear photonics, encompassing Ti:sapphire and rare-earth amplifiers, as well as material platforms based on silicon nitride, sapphire, and lithium niobate. Across these efforts, we have demonstrated amplifiers with net gains exceeding 20 dB, lasers operating from the visible edge to the telecommunications band, optical cavities with quality factors beyond 100 million, and Kerr frequency combs that span more than an octave.
We will also highlight advances in the parallel manipulation of electromagnetic waves using chip-scale photonics enabled by computational optimization. In particular, we explore how optimized photonic structures can independently control light in both spatial and spectral domains, bridging linear and nonlinear regimes to unlock new levels of functionality and integration.
Language: English
Host Professor: Takuro Ideguchi
Contact: seminar-office@utripl.u-tokyo.ac.jp
Note:
Please complete your registration through the Google Form below.
https://forms.gle/X1KVPQSifKCsztAu5
The Zoom link will be sent to your registered email address prior to the event.
This seminar is open to the public. Participants are kindly requested to provide their name, affiliation, and email address upon registration.