The present invention relates to a system for biodetection applications comprising two basic elements, a substrate with a functionalized surface and a nanoparticle, the system being capable of enhancing the plasmonic effect of the nanoparticle. The invention also relates to a biosensor incorporating such system, in addition to the method for detecting and quantifying a target analyte selected in a sample using such system. Finally, the invention relates to a device which can detect the enhanced optoplasmonic effect of the nanoparticles by means of the system of the invention or by combining the detection of such optoplasmonic effect with the analysis of the changes in the mechanical characteristics in the substrate.

A stable suspension of gold-coated silver nanoplates which is applicable to detection of various substances and able to accommodate various detection means and with which high detection sensitivity is attained in the detection of substances. This suspension of gold-coated silver nanoplates is characterized by containing 0-50 M water-soluble polymer and having a pH of 10 or less.

An optical device includes a transparent substrate and a conductive layer disposed over an upper surface of the transparent substrate. The conductive layer defines at least one groove inwardly extending from an upper surface and includes an aperture that is spaced apart from the at least one groove. An interface between the upper surface of the conductive layer and an ambient medium defines an optical branch along which surface plasmon polariton modes are excited in response to at least partially coherent light being received by the optical device.

The current invention is directed to a method for determining homodimeric avid-binding side-products of a bispecific antibody in a sample comprising the correctly assemble heterodimeric affine-binding bispecific antibody and the mis-assembled homodimeric avid-binding side-product of the bispecific antibody using surface plasmon resonance, wherein the correctly assembled heterodimeric affine-binding bispecific antibody comprises one or more binding site for a first antigen and one or more binding sites for a second antigen, wherein the mis-assembled homodimeric avid-binding side-product of the bispecific antibody comprises two or more binding sites to the first antigen but at least more than the correctly assembled bispecific antibody, wherein the correctly assembled bispecific antibody is a heterodimer and the mis-assembled bispecific antibody is a homodimer, wherein the presence of the homodimeric avid-binding side-product is determined if residual binding, i.e. an increased SPR signal, can be determined in the dissolution phase of the SPR analysis.

A biosensor device including a metal layer, a transparent substrate layer, and a dielectric layer, wherein the metal layer includes a plurality of sub-wavelength apertures, and wherein the dielectric layer is located between the metal layer and the transparent substrate layer to form a spectrally isolated and well-defined optical transmission resonance through the extraordinary optical transmission (EOT) phenomenon.

There are provided an SPR sensor cell and sensor, both having very excellent detection sensitivity. The SPR sensor cell includes: an under-cladding layer; a core layer, at least a part of the core layer being adjacent to the under-cladding layer; and a metal layer covering the core layer. The core layer includes a uniform layer and a gradient layer arranged between the uniform layer and the under-cladding layer; a refractive index N.sub.CO of the uniform layer satisfies a relationship of 1.34N.sub.CO<1.44; a refractive index N.sub.CL of the under-cladding layer and the refractive index N.sub.CO of the uniform layer satisfy a relationship of N.sub.CON.sub.CL0.020; and a refractive index of the gradient layer gradually increases from an under-cladding layer side to a uniform layer side in a thickness direction of the gradient layer within a range of from more than the N.sub.CL to less than the N.sub.CO.

A microfluidic sensor chip includes a body comprising a substrate and an upper cover, and the upper cover having at least one opening, at least one microfluidic channel formed on the substrate and has a supporting surface, wherein the at least one microfluidic channel communicates with the at least one opening, and a metamaterial layer coated on the supporting surface, wherein the metamaterial layer has a plurality of regions, and each region has a corresponding resonance pattern. The present disclosure further provides a measuring system for microfluidic sensor chip includes a carrying board, a plurality of the microfluidic sensor chips, a transmitter emitting a terahertz wave corresponding to the resonance pattern of one of the microfluidic sensor chips, a receiver receiving a reflected wave corresponding to the terahertz wave, and a processor receiving the reflected wave from the processor, and determining a testing sample characteristic according to the reflected wave.

A surface plasmon resonance imaging apparatus is provided. The surface plasmon resonance imaging apparatus includes a light irradiation unit configured to irradiate polarized light onto a metal coating film provided on one surface of a prism, a light modulator configured to spatially pattern-encode light reflected by the metal coating film and the prism, a light detector configured to detect a pattern-encoded light signal, obtained through pattern-encoding by the light modulator, as a spectral signal, a signal processor configured to spatially decode the spectral signal and analyze a decoded spectral signal to generate characteristic data of a sample provided on the metal coating film, and an output unit configured to output the characteristic data of the sample as a two-dimensional (2D) image.

A localised surface plasmonic sensing device is disclosed. This comprises: a substrate; a first, second, third and fourth (at least) array of localised surface plasmon resonance island structures on the substrate, each array located to be spaced apart and isolated from each other on the substrate. Each array also has different surface functionalisations for selective interaction with respective analytes. The selective interaction with respective analytes of the first, second, third and fourth surface functionalisations is other than by specific binding of the respective analytes, thereby allowing for cross-reactive sensing by simultaneous analysis of localised surface plasmons at each array of localised surface plasmon resonance island structures. Also disclosed is a method of analysing a fluid to detect the presence and/or concentration of at least one analyte, using such a device.

An antimonene-based surface plasmon resonance prism coupler sensor, a miRNA detection device, a dual-retarder polarimetry system, and a method for detecting a concentration of a miRNA in a biological sample are provided. The antimonene-based surface plasmon resonance prism coupler sensor includes a prism, a tantalum pentoxide thin film layer, a gold thin film layer and an antimonene layer in sequence from bottom to top. The miRNA detection device includes the antimonene-based surface plasmon resonance prism coupler sensor, a capture nucleic acid, a detection probe and a reporter nucleic acid set. The dual-retarder polarimetry system includes the miRNA detection device, a light source, a polarizer, a liquid crystal phase variable retarder group, a Stokes polarimeter and a computing module. The method includes using the dual-retarder polarimetry system with a decomposition Mueller matrix to detect the concentration of the miRNA in the biological sample.