Low-threshold lasing by merging optical BICs | Mr. Kirill Koshelev скачать в хорошем качестве

Low-threshold lasing by merging optical BICs | Mr. Kirill Koshelev

Optical Seminar at The Department of Physics & Engineering, ITMO | 9 Jul 2021 Timecodes are below the abstract. Mr. Kirill Koshelev, ITMO University Australian National University Title: "Low-threshold lasing by merging optical BICs" Wavelength-scale lasers provide promising applications through low power consumption requiring for optical cavities with increased quality factors. Cavity radiative losses can be suppressed strongly in the regime of optical bound states in the continuum (BICs); however, a finite size of the resonator limits the performance of BICs as cavity modes for active nanophotonic devices. Here, we employ the concept of a super-BIC mode created by merging symmetry-protected and accidental BICs in the momentum space, and realize an efficient laser based on a finite-size cavity with a small footprint. We trace the evolution of lasing properties before and after the merging point by varying the lattice spacing, and we reveal that the super-BIC laser demonstrates the significantly reduced threshold, substantially increased quality factor, and shrunken far-field images. 0:00:00 INTRO 0:00:09 Start of the talk 00:00:50 Meta-optics overview 00:02:15 Outline 00:02:46 BIC phenomena 00:07:15 Q1:Which QF should be grater:for a symetry protected one or for an accidental bound state in the continuum when the system has looses? 00:07:50 BIC in real metamaterials 00:08:50 Lasing with BICs 00:10:50 Super BIC 00:16:26 Lasing with super-BICs 00:21:00 Technical issue 00:21:50 Q2: What caused the QF increasing (in the current research)? 00:23:05 Q3: Graph description 00:30:00 BIC lasing (a comparison table) 00:31:27 Summary 00:32:40 Acknoledgements 00:33:00 Discussion 00:46:10 End The Department of Physics and Engineering of ITMO University (Saint Petersburg, Russia) hosts online weekly seminars to discuss recent scientific achievements of researchers from all over the world with a wide audience. The topics include experimental (Optical seminar) and theoretical (Theoretical seminar) aspects of nanophotonics, solid-state physics, material science, as well as design and applications of radiofrequency structures and devices (Microwave seminar). Upcoming and past events can be found at https://physics.itmo.ru/en/seminars   / physics.itmo     / physics_itmo     / physics.itmo   #OpticalSeminar #ITMO #новыйфизтех #scientificseminar