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Reflectance-based two-dimensional TiO2 photonic crystal liquid sensors
Yujian Huang1, Grégory Pandraud, Pasqualina M Sarro
1DIMES-ECTM, Delft University of Technology, Delft, The Netherlands. yujian.huang@tudelft.nl
Optics Letters
|August 4, 2012
Summary
We developed a new photonic crystal (PC) liquid sensor using TiO2 nanopillars. This sensor detects liquid changes by measuring shifts in light reflectance, showing promise for environmental and biological monitoring.
Area of Science:
- Nanophotonics
- Materials Science
- Chemical Sensing
Background:
- Photonic crystals (PCs) offer unique optical properties for sensing applications.
- Developing sensitive and reliable liquid sensors is crucial for biological and environmental monitoring.
Purpose of the Study:
- To propose and demonstrate a reflectance-based photonic crystal liquid sensor.
- To investigate the sensor's performance with varying liquid refractive indices.
Main Methods:
- Fabrication of a photonic crystal using two-dimensional TiO2 nanopillar arrays.
- Experimental measurement of reflectance peak shifts with different liquid refractive indices (1.333 to 1.390).
- Development and validation of a reflectance model.
Main Results:
- A linear shift in reflectance peaks was observed with changing liquid refractive index near 1.5 μm.
- The experimental results showed excellent agreement with the developed reflectance model.
- The sensor demonstrated enhanced signal due to its large functional area and simplified optical guiding.
Conclusions:
- The demonstrated reflectance-based TiO2 PC liquid sensor is highly sensitive to changes in liquid refractive index.
- The sensor's design simplifies optical guiding and enhances signal detection.
- This technology holds significant potential for future biological and environmental sensing applications.
