Biochemical sensing with a polymer-based micromachined Fabry-Perot sensor.

Area of Science:

• Biomedical Engineering
• Materials Science
• Optical Sensing

Background:

• Optical sensors offer sensitive detection methods for biochemical analysis.
• Fabry-Perot interferometers (FPIs) are effective optical cavities for sensing applications.
• Polymer-based microfabrication allows for cost-effective and versatile sensor development.

Purpose of the Study:

• To develop and characterize a novel polymer-based micromachined Fabry-Perot interferometer (microFPI) for biochemical sensing.
• To demonstrate the sensor's ability to detect specific biochemicals by measuring changes in refractive index.
• To evaluate the sensitivity and performance of the microFPI for biological analyte detection.

Main Methods:

• Fabrication of the microFPI using polydimethylsiloxane (PDMS) and glass substrates via soft-lithography and bonding techniques.
• Utilizing a white-light source for interrogation of the FPI's optical response.
• Measuring the shift in the transducing signal (related to effective refractive index changes) upon exposure to biochemicals.

Main Results:

• Successful fabrication of a polymer-based microFPI biochemical sensor.
• Demonstrated detection of various biochemicals, including rabbit immunoglobulin G (IgG).
• Achieved detection of rabbit IgG at concentrations as low as 5 to 50 ng/ml without device optimization.

Conclusions:

• The developed polymer-based microFPI is a promising platform for sensitive and label-free biochemical detection.
• The sensor's performance is directly linked to changes in the effective refractive index within the Fabry-Perot cavity.
• The microFPI technology shows potential for various diagnostic and analytical applications in life sciences.