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Published on: August 30, 2012
Efficient Chemical Sensing by Coupled Slot SOI Waveguides.
Vittorio M N Passaro1, Francesco Dell'olio, Caterina Ciminelli
1Dipartimento di Elettrotecnica ed Elettronica, Politecnico di Bari, via Edoardo Orabona n. 4, 70125 Bari, Italy.
Sensors (Basel, Switzerland)
|March 9, 2012
Summary
This study presents a compact guided-wave chemical sensor using slot optical waveguides for detecting pollutants and biochemicals. It achieves high sensitivity with a minimum detectable refractive index change of 10(-5).
Area of Science:
- Photonics
- Nanotechnology
- Chemical Sensing
Background:
- Guided-wave sensors offer sensitive detection of analytes.
- Compact sensor designs are crucial for practical applications.
- Slot optical waveguides enable strong light confinement.
Purpose of the Study:
- To design a compact guided-wave chemical sensor.
- To achieve high sensitivity for detecting environmental pollutants and biochemical substances.
- To optimize sensor performance using Silicon-on-Insulator technology.
Main Methods:
- Asymmetric directional coupler with slot optical waveguides.
- Nanometer guiding structure for optical mode confinement.
- Finite Element Method and Coupled Mode Theory for accurate modeling.
- Silicon-on-Insulator (SOI) technology for fabrication.
Main Results:
- A compact sensor with a device area of approximately 1200 μm(2).
- Minimum detectable refractive index change as low as 10(-5).
- Optimized trade-off between device length and sensitivity.
- Expected sensitivity to glucose concentration of 0.1 g/L.
Conclusions:
- The designed guided-wave sensor demonstrates high sensitivity and compactness.
- The sensor is suitable for detecting environmental pollutants and biochemical substances.
- The employed nanometer guiding structure and SOI technology are effective for advanced sensor development.
