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dc.contributor.authorDickenson, Nicholas E.
dc.contributor.authorErickson, Elizabeth S.
dc.contributor.authorMooren, Olivia L.
dc.contributor.authorDunn, Robert C.
dc.date.accessioned2014-12-05T17:05:10Z
dc.date.available2014-12-05T17:05:10Z
dc.date.issued2007-04-07
dc.identifier.citationDickenson, Nicholas E., Erickson, Elizabeth S., Mooren, Olivia L., Dunn, Robert C. "Characterization of power induced heating and damage in fiber optic probes for near-field scanning optical microscopy." Rev. Sci. Instrum. 78, 053712 (2007); http://dx.doi.org/10.1063/1.2740133.
dc.identifier.urihttp://hdl.handle.net/1808/16054
dc.descriptionThis is the published version, also available here: http://dx.doi.org/10.1063/1.2740133.
dc.description.abstractTip-induced sample heating in near-field scanning optical microscopy (NSOM) is studied for fiber optic probes fabricated using the chemical etching technique. To characterize sample heating from etched NSOM probes, the spectra of a thermochromic polymer sample are measured as a function of probe output power, as was previously reported for pulled NSOM probes. The results reveal that sample heating increases rapidly to ∼55–60°C as output powers reach ∼50nW. At higher output powers, the sample heating remains approximately constant up to the maximum power studied of ∼450nW. The sample heating profiles measured for etched NSOM probes are consistent with those previously measured for NSOM probes fabricated using the pulling method. At high powers, both pulled and etched NSOM probes fail as the aluminumcoating is damaged. For probes fabricated in our laboratory we find failure occurring at input powers of 3.4±1.7 and 20.7±6.9mW for pulled and etched probes, respectively. The larger half-cone angle for etched probes (∼15° for etched and ∼6° for pulled probes) enables more light delivery and also apparently leads to a different failure mechanism. For pulled NSOM probes, high resolution images of NSOM probes as power is increased reveal the development of stress fractures in the coating at a taper diameter of ∼6μm. These stress fractures, arising from the differential heating expansion of the dielectric and the metalcoating, eventually lead to coating removal and probe failure. For etched tips, the absence of clear stress fractures and the pooled morphology of the damaged aluminumcoating following failure suggest that thermal damage may cause coating failure, although other mechanisms cannot be ruled out.
dc.publisherAmerican Institute of Physics
dc.subjectEtching
dc.subjectMetallic coatings
dc.subjectAluminium
dc.subjectOptical coatings
dc.subjectFracture mechanics
dc.titleCharacterization of power induced heating and damage in fiber optic probes for near-field scanning optical microscopy
dc.typeArticle
kusw.kuauthorDickenson, Nicholas E.
kusw.kuauthorErickson, Elizabeth S.
kusw.kuauthorMooren, Olivia L.
kusw.kuauthorDunn, Robert C.
kusw.kudepartmentChemistry
dc.identifier.doi10.1063/1.2740133
dc.identifier.orcidhttps://orcid.org/0000-0003-1572-6077
kusw.oaversionScholarly/refereed, publisher version
kusw.oapolicyThis item does not meet KU Open Access policy criteria.
dc.rights.accessrightsopenAccess


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