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SUMMARY:Promotionsvortrag Physik: Towards photon pair generation via s
 pontaneous four-wave mixing in nonlinear metasurfaces
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 00000010000000162F2A31C90BD443BF85C506E05FD0F2
DESCRIPTION:Ankündigung des Promotionsvortrags von: Herrn Changjin So
 n Entangled photons have acted as a workhorse in many quantum technolo
 gies\, including cryptog-raphy\, imaging\, sensing\, and computation. 
 With the growing demands of quantum technology\, the entangled photon 
 pair sources are required to be compact and integrable. For the last f
 ew years\, the field of quantum optics in the nanoscale has demonstrat
 ed photon pair generation in &#8216\;flat&#8217\; optics such as thin 
 layers\, Van der Waals crystals\, micro-\, nano-antennas\, and metasur
 faces. The word &#8216\;flat&#8217\; is used because such optical plat
 forms have sub-wavelength thicknesses. Due to the short travel length 
 inside the sources\, they can possess multiple functions that their bu
 lky coun-terparts cannot have. This presentation addresses photon pair
  generation in &#8216\;flat&#8217\; optics via second- and third-order
  non-linear processes\, which are spontaneous parametric down-conversi
 on (SPDC) and spontaneous four-wave mixing (SFWM). The main aims of th
 is presentation are to understand how the photon pair generation is re
 alized via SPDC and SFWM on subwavelength-scale platforms\, and to mak
 e a bridge between photon pair generation via two nonlinear processes 
 under the presence of opti-cal resonances. The topic of the presentati
 on covers SPDC in a gallium phosphide (GaP) metasurface\, SFWM in a th
 in lithium niobate (LN) layer and silicon-rich silicon nitride layers\
 , and\, finally\, fabrication of a metasurface for the SFWM for future
  work. (Vortrag auf Englisch) Dem Vortrag schließt sich eine Diskussi
 on von 15 Minuten an. Vortrag und Diskussion sind öffentlich. Diesen 
 Verfahrensteilen folgt ein nicht öffentliches Rigorosum von 45 Minute
 n.
DTSTART:20260224T123000Z
DTEND:20260224T140000Z
LOCATION:Hörsaal F\, Biologikum-Hörsaalgebäude\, Staudtstr. 5\, Erlangen
DTSTAMP:20260405T073042Z
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