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SEQUENCE:1
UID:UW-Physics-Event-7865
DTSTART:20220921T150000Z
DTEND:20220921T170000Z
DTSTAMP:20260414T152657Z
LAST-MODIFIED:20220906T144807Z
LOCATION:Engineering 3609 and virtual-https://uwmadison.zoom.us/j/9424
 2686133?pwd=MjhURDFhVFJjYU1VY25Vcit5dElZZz09 
SUMMARY:Micro- and nano-optical components for quantum technologies\, 
 Thesis Defense\, Zhaoning April Yu \, Physics PhD Graduate Student
DESCRIPTION:The booming of quantum technologies offers exciting opport
 unities in the field of optics. This thesis includes our effort to add
 ress three optical challenges when building a quantum repeater or a qu
 antum chemical sensor\, they are: (1) how to engineer diffraction grat
 ings for trapping cold atom clusters\; (2) how to efficiently generate
  optical bottle beams using a single surface-patterned chip\; and (3) 
 how to extract fluorescence from color centers in diamond without dama
 ging the diamond surface. To interact with a small (atom-scale) quantu
 m system\, miniaturized optical components are often needed with micro
 - or nanometer structuring. Such compact structuring poses requirement
 s in both simulation and fabrication methods. On the one hand\, when d
 esigning and evaluating a micro- or nano optical component\, unlike co
 nventional bulky optics where light can be approximated as rays\, the 
 electromagnetic field must be calculated with nm-scale spatial resolut
 ion. On the other hand\, when making a micro- or nano optical componen
 t\, conventional mechanical polishing can not provide sufficient accur
 acy\, thus researchers resort to advanced lithography techniques (such
  as electron-beam lithography\, laser lithography) which has already b
 een used in the semiconductor industry. The methods are introduced and
  discussed in details for each application scenario. By using finite-d
 ifference time-domain (FDTD) simulation method and electron-beam litho
 graphy fabrication method\, we demonstrate: (1) a grating chip for tra
 pping dual atomic species\; (2) an optical metasurface for generating 
 a bottle beam array with a single Gaussian beam luminance\; and (3) a 
 silicon light extractor for enhancing the fluorescence collection from
  nitrogen-vacancy (NV) defects in diamond.
URL:https://www.physics.wisc.edu/events/?id=7865
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