Plasmonic biosensor based on molecular conformation
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United States of America Patent
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Jun 25, 2019
Grant Date -
Nov 16, 2017
app pub date -
Nov 12, 2015
filing date -
Nov 12, 2014
priority date (Note) -
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Abstract
A target analyte in a matrix is sensed using a sensor device having protrusions [500] such as e.g. nanorods, containing free charge carriers. Conformational molecules [504, 506] are bound at a first end to the protrusions, and bound at a second end to a label [502] e.g. a nanoparticle, that is free to move relative to the protrusions. The conformational molecule changes its conformation when bound to the analyte, thereby changing the distance and/or the relative orientation of the label to the protrusion. Energy [510] is used to excite free electrons in the protrusion near a plasmon resonance and resulting optical radiation [514] at wavelengths near the plasmon resonance wavelength is detected [516] and analyzed [518] to determined the presence/concentration of the analyte.
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