Optoelectronic capillary sensors in microfluidic and point-of-care instrumentation

Area of Science:

• Optoelectronics and Sensor Technology
• Chemical and Biochemical Sensing

Background:

• Classical fiber-optic sensors monitor external changes affecting light propagation within the fiber.
• Optical capillary sensors utilize changes in light transmission through capillaries filled with the analyzed liquid.

Purpose of the Study:

• To review the state-of-the-art in fiber-optic capillary sensors and related instrumentation.
• To systematize sensor types based on construction and operational principles.
• To emphasize applications in point-of-care chemical and biochemical sensing.

Main Methods:

• Comprehensive literature review.
• Inclusion of authors' original research.
• Systematic classification of sensors by design and function.

Main Results:

• Overview of current fiber-optic capillary sensor technology.
• Identification of unique applications enabled by capillary-based sensing.
• Discussion of specific challenges in sensor construction, materials, and instrumentation.

Conclusions:

• Fiber-optic capillary sensors offer distinct advantages over traditional fiber-optic sensors.
• These sensors present new avenues for point-of-care diagnostics.
• Further research is needed to address construction, material, and instrumentation challenges.