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BEGIN:VEVENT
DTSTAMP:20261018T150843Z
LAST-MODIFIED:20180809T205422Z
DTSTART:20180803T133000Z
DTEND:20180803T143000Z
UID:event2001@bu.edu
URL:http://physics.bu.edu/internal/events/show/2001
SUMMARY:Rings of Light: Using Apogized Radial Beams to Improve Resolution i
	n Solid Immersion Lens Microscopy
DESCRIPTION:Featuring Kyle Vigil\, Boston University\, Physics Department\n
	\nPart of the PhD Final Oral Exams.\n\nExamining Committee: Bennett Goldber
	g\, Selim Unlu\, Thomas Bifano\, Shyamsunder Erramilli\, David Campbell (Ch
	air)\n\nAbstract: High  Numerical Aperture  (NA)  solid  immersion lens  (S
	IL)  microscopy has  bet­ ter  resolution at  a given  wavelength than any
	  other far-field  microscopy technique. This  outstanding resolution allow
	s  the  imaging of subsurface structures several times smaller than the  fr
	ee-space wavelength of the  imaging light .   High  NA SILs  are  cur­ ren
	tly used in technology applications such as photolithography\, semiconducto
	r circuit analysis\, Raman imaging. and  crystal imaging. However\,  curren
	t techniques for SIL microscopy use  linearly polarized illumination that  
	has  focal  spot   sizes  unsuitably large  for several  important applicat
	ions. Radial polarization has  been  used  in several other lower NA micros
	copy techniques to improve focal spot  sizes;  but  generating and propagat
	ing radially polarized light  is more  difficult  than working with  linear
	ly po­ larized \, fundamental mode  Gaussian beams.  This  dissertation de
	tails modeling and experimental results showing radially polarized light  c
	ombined with  apodization and an  aplanatic SIL  can  be  used  to  create 
	a smaller focal  spot than current techniques. This  dissertation also incl
	udes experimental results of a new\,  free-space technique for apodization 
	and  creation of radially polarized light  that is capable of quickly  chan
	g­ ing the  apodization on the  fly without hardware modifications. This  
	new apodization technique is also  capable of creating arbitrary apodizatio
	n patterns more  accurately than  any previous experiment. Increased  contr
	ol  over the apodization pattern allows the experimental study  of a far wi
	der range of apodization patterns than  ever before\, potentially leading  
	to  further improvements in high-NA  focal spot  tailoring.  Addi­tionally
	\,  in situ  apodization pattern  control  allows for  new  type  of compos
	ite  SIL imaging  combining  the  results  of multiple  apodization pattern
	s.   This  dissertation concludes  with  ideas for future  work in apodizat
	ion mask optimization. An in-depth study of optimizing the  2D apodization 
	pattern to create  focal spots  tailored  to dif­ferent  applications woul
	d be an interesting and  potentially very useful endeavor.   We also discus
	ses the  possibility  of using highly  apodized  angularly confined  beams 
	 to direct  the  focal spot  to areas  of the  SIL previously  thought to b
	e unusable.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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