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Hartman interferometer: versatile integrated optic sensor for label-free, real-time quantification of nucleic acids,
B H Schneider1, J G Edwards, N F Hartman
1Photonic Sensors Systems, Atlanta, GA 30318, USA. schneider@pssmail.com
Clinical Chemistry
|September 23, 1997
Summary
The Hartman interferometer offers a novel, label-free biosensor for real-time, multianalyte diagnostics. This optical sensor detects biomolecular binding via refractive index changes, enabling rapid, quantitative results for proteins, nucleic acids, and pathogens.
Area of Science:
- Biomedical diagnostics
- Optical sensing
- Biosensor technology
Background:
- Evanescent-wave optical sensors offer label-free, real-time detection for biomolecular binding.
- Key challenges include developing cost-effective configurations for multianalyte testing.
- Existing methods can face issues with circular polarization and channel waveguides.
Purpose of the Study:
- To introduce the Hartman interferometer as a novel biosensor platform.
- To demonstrate its applicability for detecting diverse biomolecular analytes.
- To address limitations in current evanescent-wave sensor configurations.
Main Methods:
- Utilizes a proprietary integrated optic sensor based on the Hartman interferometer.
- Employs evanescent-wave sensing principles to measure refractive index changes.
- Relies on linearly polarized light and a planar waveguide format.
Main Results:
- Demonstrated the sensor's capability for detecting protein, nucleic acid, and pathogen analytes.
- Preliminary experiments show broad applicability for various biomolecular targets.
- The planar waveguide and linear polarization avoid common sensor design challenges.
Conclusions:
- The Hartman interferometer presents a promising, simplified approach for label-free, real-time multianalyte biosensing.
- This technology has the potential for widespread use in biomedical diagnostics.
- The sensor configuration is suitable for detecting a wide range of biological molecules and pathogens.