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Photonic crystal-based all-optical on-chip sensor.

Y Liu1, H W M Salemink

  • 1Department Kavli Institute of Nanoscience, Lorentzweg 1, 2628 CJ, Delft, The Netherlands.

Optics Express
|October 6, 2012
PubMed
Summary

We developed a novel all-optical sensor using a two-dimensional photonic crystal cavity. This sensor accurately measures refractive index changes with a sensitivity of 460 nm/RIU.

Area of Science:

  • Photonics
  • Nanotechnology
  • Optical Sensing

Background:

  • Photonic crystal cavities offer unique optical properties for sensing applications.
  • Developing highly sensitive and label-free detection methods is crucial for various scientific fields.

Purpose of the Study:

  • To demonstrate a novel all-optical sensor based on a two-dimensional photonic crystal cavity.
  • To investigate the sensor's working principle through design, simulation, fabrication, and experimental validation.
  • To quantify the sensor's sensitivity to refractive index variations.

Main Methods:

  • Design and theoretical simulation of a two-dimensional photonic crystal cavity.
  • Fabrication of the photonic crystal cavity structure.
  • Experimental validation using micro-fluidic channels for analyte infiltration.

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  • Measurement of resonant wavelength shifts in response to refractive index changes.

    • Main Results:

    • Successful demonstration of the photonic crystal cavity sensor's working principle.
    • Experimental confirmation of the sensor's sensitivity.
    • Achieved a high sensitivity of 460 nm/RIU (nanometers per refractive index unit).

    Conclusions:

    • The developed all-optical sensor based on a two-dimensional photonic crystal cavity is effective for refractive index sensing.
    • The sensor exhibits high sensitivity, making it suitable for detecting subtle changes in analyte properties.
    • This technology holds promise for advanced optical sensing applications.