Method of Producing a Surface Plasmon Generator, a Surface Plasmon Generator and a Sensor Incorporating the Surface Plasmon Generator
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United States of America Patent
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Issued Date -
May 19, 2011
app pub date -
Nov 4, 2008
filing date -
Nov 15, 2007
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Abandoned
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Abstract
Surface plasmon generation on a metal or semiconductor layer at an outer surface of an optical waveguide, using light reflected or scattered from inside the optical waveguide. One aspect provides a main optical waveguide (11) (e.g. optical fibre) having a second optical waveguide (18) adhered thereto, the second optical waveguide including an optically transparent material (610) separating two surface plasmon supporting layers (600, 620). Another aspect provides a surface plasmon supporting layer of material(s) adhered to the main optical waveguide, the layer having photo-induced regions of material compaction. The regions of compaction may cause un-inscribed refractive index modulations in the main optical waveguide. The surface plasmons are coupled to the guided mode(s) in the main optical waveguide. Surface plasmon resonance depends on sample material in contact with an outermost surface plasmon supporting layer. Properties of the sample material can thus be detected in output guided mode(s) because of the coupling with the generated surface plasmons.
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