Integrated Optical Biosensing Techniques
Summary
Integrated optical biosensing techniques harness the interaction of light with biological analytes through precisely engineered photonic structures. By guiding light within waveguides, resonators or interferometers, these systems exploit evanescent fields to transduce minute refractive index changes at functionalised surfaces into measurable optical signals. Integration of microfluidic channels allows controlled sample delivery and multiplexing of assays, while advances in nanofabrication—such as subwavelength gratings and nanoporous scaffolds—enhance sensitivity and limit of detection. Recent efforts focus on on-chip light sources, compact interrogation schemes and noise-optimised read-out to enable robust, label-free detection of proteins, pathogens and small molecules. The resulting platform technologies promise rapid point-of-care diagnostics, environmental monitoring and high-throughput screening in a cost-effective and scalable format.
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Integrated Optical Biosensing Techniques publication trend
The graph below shows the total number of articles in integrated optical biosensing techniques across all publications each year (not limited to Nature Index journals).
Technical terms
Evanescent field: Exponentially decaying electromagnetic field extending from an optical waveguide or resonator into the surrounding medium, enabling sensitive detection of refractive index changes near the sensor surface.
Refractive index unit (RIU): Standardised measure of refractive index change used to express sensor sensitivity to the presence of analytes.
Label-free biosensing: Detection method that relies on intrinsic optical changes induced by target molecules without the need for fluorescent or enzymatic tags.
Subwavelength grating: Nanostructured periodic pattern with a pitch smaller than the wavelength of light, designed to manipulate transmission and enhance sensor performance.
Microfluidics: Technology for controlling and analysing small volumes of fluid in channels of micrometre dimensions, often integrated with optical sensors for precise sample handling.
Interferometer: Optical instrument that splits and recombines light waves to measure phase or intensity variations caused by changes in a sample’s optical properties.
Waveguide: Dielectric structure that confines and guides light along a defined path, facilitating strong interaction between the guided field and adjacent analytes.
References
- Zero-crosstalk silicon photonic refractive index sensor with subwavelength gratings. Nano Convergence (2024).
- Microfluidics on lensless, semiconductor optical image sensors: challenges and opportunities for democratization of biosensing at the micro-and nano-scale. Nanophotonics (2023).
- Optical Interferometric Device for Rapid and Specific Detection of Biological Cells. Biosensors (2024).
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