Photonic biosensor arrays
First Claim
1. A biosensor array for Plasmon resonance-based sensing of a plurality of different biological targets simultaneously, the array comprising a transparent substrate having a surface bearing a plurality of assay spots for Plasmon resonance sensing, each of said assay spots comprising a discrete metallic island, said metallic island comprising a plurality of metallic nanoparticles to which are attached functionalizing molecules for binding to said biological target, different said islands being different said functionalizing molecules for binding to different ones of said biological targets, and wherein total internal reflection of light at said surface at a wavelength at or near said plasmon resonance results in scattering of said light away from said surface, said scattering being modulated by said binding of said biological targets;
- wherein said metallic islands of said array are spaced apart, arranged at intervals of at least 0.1 mm on a non-conducting substrate, andwherein within said metallic island, said plurality of metallic nanoparticles comprise a discontinuous layer of individual, multi-faceted nanoparticles.
1 Assignment
0 Petitions
Accused Products
Abstract
This invention relates to photonic biosensor arrays in particular employing plasmon resonance based sensing, and to methods and apparatus for reading such arrays. A biosensor array for plasmon resonance-based sensing of a plurality of different biological targets simultaneously, the array comprising a transparent substrate having a surface bearing a plurality of assay spots for plasmon resonance sensing, each of said assay spots comprising a discrete metallic island, a said metallic island comprising a plurality of metallic nanoparticles to which are attached functionalizing molecules for binding to a said biological target, different said islands bearing different said functionalizing molecules for binding to different ones of said biological targets, and wherein total internal reflection of light at said surface at a wavelength at or near a said plasmon resonance results in scattering of said light away from said surface, said scattering being modulated by said binding of said biological targets.
-
Citations
22 Claims
-
1. A biosensor array for Plasmon resonance-based sensing of a plurality of different biological targets simultaneously, the array comprising a transparent substrate having a surface bearing a plurality of assay spots for Plasmon resonance sensing, each of said assay spots comprising a discrete metallic island, said metallic island comprising a plurality of metallic nanoparticles to which are attached functionalizing molecules for binding to said biological target, different said islands being different said functionalizing molecules for binding to different ones of said biological targets, and wherein total internal reflection of light at said surface at a wavelength at or near said plasmon resonance results in scattering of said light away from said surface, said scattering being modulated by said binding of said biological targets;
-
wherein said metallic islands of said array are spaced apart, arranged at intervals of at least 0.1 mm on a non-conducting substrate, and wherein within said metallic island, said plurality of metallic nanoparticles comprise a discontinuous layer of individual, multi-faceted nanoparticles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. An apparatus for reading a plasmon resonance sensing array for plasmon resonance-based sensing of a plurality of different biological targets, the array comprising a transparent substrate having a surface being a plurality of assay spots for said plasmon resonance testing, the apparatus comprising:
-
a light source to generate polarized light; a polarization modulator to modulate a polarization of said polarized light; an optical system to illuminate said array with said modulated polarized light to generate plasmons in said assay spots by total internal reflection of said polarized light wherein s- and p-polarization components of said polarized light do not self-interfere; a detection system to detect an orientation of an elliptical polarisation of said totally internally reflected modulated polarized light; and an output to output a target sensing signal dependent on binding of said biological target to said functionalizing molecule responsive to detection of a change in said elliptical polarization orientation; and said plasmon resonance sensing array wherein each of said assay spots comprising a discrete metallic island, said metallic island comprising a plurality of metallic nanoparticles to which are attached functionalizing molecules for binding to said biological target, different said islands bearing different said functionalizing molecules for binding to different ones of said biological targets; wherein said metallic islands of said array are spaced apart, arranged at intervals of at least 0.1 mm on a non-conducting substrate and wherein within said metallic island, said plurality of metallic nanoparticles comprise a discontinuous layer of individual, multi-faceted nanoparticles. - View Dependent Claims (21, 22)
-
Specification