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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 27 — Sep. 20, 2009
  • pp: 5155–5163

Using quantum dots to tag subsurface damage in lapped and polished glass samples

Wesley B. Williams, Brigid A. Mullany, Wesley C. Parker, Patrick J. Moyer, and Mark H. Randles  »View Author Affiliations


Applied Optics, Vol. 48, Issue 27, pp. 5155-5163 (2009)
http://dx.doi.org/10.1364/AO.48.005155


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Abstract

Grinding, lapping, and polishing are finishing processes used to achieve critical surface parameters in a variety of precision optical and electronic components. As these processes remove material from the surface through mechanical and chemical interactions, they may induce a damaged layer of cracks, voids, and stressed material below the surface. This subsurface damage (SSD) can degrade the performance of a final product by creating optical aberrations due to diffraction, premature failure in oscillating components, and a reduction in the laser induced damage threshold of high energy optics. As these defects lie beneath the surface, they are difficult to detect, and while many methods are available to detect SSD, they can have notable limitations regarding sample size and type, preparation time, or can be destructive in nature. The authors tested a nondestructive method for assessing SSD that consisted of tagging the abrasive slurries used in lapping and polishing with quantum dots (nano-sized fluorescent particles). Subsequent detection of fluorescence on the processed surface is hypothesized to indicate SSD. Quantum dots that were introduced to glass surfaces during the lapping process were retained through subsequent polishing and cleaning processes. The quantum dots were successfully imaged by both wide field and confocal fluorescence microscopy techniques. The detected fluorescence highlighted features that were not observable with optical or interferometric microscopy. Atomic force microscopy and additional confocal microscope analysis indicate that the dots are firmly embedded in the surface but do not appear to travel deep into fractures beneath the surface. Etching of the samples exhibiting fluorescence confirmed that SSD existed. SSD-free samples exposed to quantum dots did not retain the dots in their surfaces, even when polished in the presence of quantum dots.

© 2009 Optical Society of America

OCIS Codes
(160.2750) Materials : Glass and other amorphous materials
(220.5450) Optical design and fabrication : Polishing

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: July 1, 2009
Manuscript Accepted: August 13, 2009
Published: September 11, 2009

Citation
Wesley B. Williams, Brigid A. Mullany, Wesley C. Parker, Patrick J. Moyer, and Mark H. Randles, "Using quantum dots to tag subsurface damage in lapped and polished glass samples," Appl. Opt. 48, 5155-5163 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-27-5155


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