Coaxial Micro Ring Arrays Fabricated on Self-Assembled Microtube Cavities for Resonant Light Modulation

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Christian N. Saggau - , Leibniz Institute for Solid State and Materials Research Dresden, Chemnitz University of Technology (Author)
  • Sreeramulu Valligatla - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Xiaoyu Wang - , Institute of Applied Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Haiyun Dong - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Libo Ma - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Oliver G. Schmidt - , Chemnitz University of Technology, TUD Dresden University of Technology (Author)

Abstract

Composite optical microcavities, as a versatile platform for light manipulation, have been theoretically revealed that the configuration of concentrically coupled resonant trajectories can significantly enhance the coupling strength, which is however challenging in experimental preparation. Here coaxial whispering gallery resonator chains were designed and fabricated with optically coupled modes split apart by more than the free spectral range (FSR) of the cavity itself. Because such three dimensional (3D) coupled optical systems are extremely difficult to obtain with traditional processing techniques an approach is developed to release and roll-up pre-strained, nanostructured silicon nitride membranes into microtubular optical cavities. Parallel nano-ridges modified on the patterned membranes form into coaxial micro ring arrays after the membrane rolls up into a microtubular structure. Energetic degeneracy, as a consequence of mode splitting exceeding the FSR, leads to interference between bonding and antibonding modes with different mode identities (mode number), resulting in novel light modulation in the form of hybrid super wave modes, which display a distinct hopping behavior resembling linear stretch modes of an oscillator chain.

Details

Original languageEnglish
Article number2200085
JournalLaser and Photonics Reviews
Volume16
Issue number9
Publication statusPublished - Sept 2022
Peer-reviewedYes

Keywords

Keywords

  • 3D photonics, nanomembranes, photonic molecules, roll-up, self-assembly, whispering gallery mode resonators