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Method and apparatus for evanescent filed measuring of particle-solid separation

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dc.contributor.assigneeVirginia Tech Intellectual Properties, Inc.en
dc.contributor.inventorWalz, John C.en
dc.contributor.inventorDucker, William A.en
dc.contributor.inventorClark, Spencer C.en
dc.date.accessed2016-08-19en
dc.date.accessioned2016-08-24T17:54:41Zen
dc.date.available2016-08-24T17:54:41Zen
dc.date.filed2004-07-12en
dc.date.issued2007-06-26en
dc.description.abstractEvanescent wave scattering by a scanning probe in a scanning probe microscope is utilized to determine and monitor separation between a scanning probe and a sample. A laser light is totally internally reflected at the interface between a more optically dense (incident) medium and less optically dense (transmitting) medium, exciting a decaying evanescent field in the less optically dense medium. A scanning probe, such as a colloidal probe, is dipped into the evanescent field, which scatters off the scanning probe. The portion of the scattered field propagates back into the incident medium and is then detected by a detector. A dependency between the intensity of the scattered evanescent field and the separation between the probe and the incident medium was measured and used in determining the separation. This dependency of intensity is used to prepare images or maps of interfaces. A particular application of determining the separation between the probe and the sample in an atomic force microscope is disclosed.en
dc.format.mimetypeapplication/pdfen
dc.identifier.applicationnumber10889331en
dc.identifier.patentnumber7234343en
dc.identifier.urihttp://hdl.handle.net/10919/72564en
dc.identifier.urlhttp://pimg-fpiw.uspto.gov/fdd/43/343/072/0.pdfen
dc.language.isoen_USen
dc.publisherUnited States Patent and Trademark Officeen
dc.subject.cpcB82Y35/00en
dc.subject.cpcG01Q60/06en
dc.subject.cpcG01Q20/02en
dc.subject.uspc250/235en
dc.subject.uspcother250/307en
dc.subject.uspcother73/105en
dc.titleMethod and apparatus for evanescent filed measuring of particle-solid separationen
dc.typePatenten
dc.type.dcmitypeTexten
dc.type.patenttypeutilityen

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