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SUMMARY:Promotionsvortrag Physik: Visualization of intra-cavity dynami
 cs of high-quality factor microresonators
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 00000010000000162F2A31C90BD443BF85C506E05FD0F2
DESCRIPTION:Ankündigung des Promotionsvortrags von: Herrn Haochen Yan
  Whispering-gallery-mode (WGM) microresonators are powerful platforms 
 for nonlinear optics and light-matter interactions because they combin
 e optical confinement\, ultra-low loss\, and high quali-ty factors. Th
 ese properties support phenomena such as frequency comb generation\, R
 aman las-ing Brillouin scattering\, and spontaneous symmetry breaking.
  However\, conventional transmission and reflection measurements provi
 de only indirect and spatially averaged information\, limiting ac-cess
  to intra-cavity dynamics. In this talk\, I present a visualization me
 thod based on collecting scattered light from WGM micro-resonators wit
 h a short-wave infrared (SWIR) camera. This approach enables observati
 on of spa-tial evolution of resonant modes beyond spectral measurement
 s. I show how this imaging frame-work reveals standing-wave formation\
 , Kerr comb dynamics\, cascaded Brillouin processes\, and spontaneous 
 symmetry breaking\, and how the observed patterns can be analyzed quan
 titatively to distinguish different dynamical regimes. I also present 
 a simplified fabrication strategy for high-Q aluminum nitride microres
 onators based on a single silicon nitride hard mask and conductive pol
 ymer. This method avoids a metal mask while still achieving intrinsic 
 quality factors up to 10^6 and enabling strong nonlinear effects. Over
 -all\, the dissertation combines device fabrication\, nonlinear photon
 ics\, and optical diagnostics\, and points toward applications in sens
 ing\, defect characterization\, and photonic control. (Vortrag auf Eng
 lisch) Dem Vortrag schließt sich eine Diskussion von 15 Minuten an. V
 ortrag und Diskussion sind öffentlich. Diesen Verfahrensteilen folgt 
 ein nicht öffentliches Rigorosum von 45 Minuten.
DTSTART:20260421T130000Z
DTEND:20260421T143000Z
LOCATION:Leuchs-Russell-Auditorium A 1.500\, MPI\, Staudtstr. 2\, Erlangen
DTSTAMP:20260417T002240Z
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