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Summary

This study introduces a novel Fabry-Pérot microcavity with a record quality factor and high sensitivity for refractometry. The innovative design enhances optical sensing capabilities for micro-opto-fluidic applications.

Keywords:
Fabry–Pérot cavitylab-on-a-chipon-chip refractometeroptical micro cavityoptofluidic sensorrefractive index measurementstable optical resonator

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Area of Science:

  • Photonics and optical sensing
  • Microcavity resonators
  • Optofluidics

Background:

  • Fabry-Pérot cavities are crucial for optical sensing but often face limitations in quality factor and sensitivity.
  • Previous designs for on-chip refractometers have drawbacks that hinder performance and applicability.
  • Accurate modeling of microcavity behavior is essential for optimizing device design.

Purpose of the Study:

  • To report a novel Fabry-Pérot microcavity structure with enhanced performance.
  • To achieve the highest reported quality factor for an on-chip Fabry-Pérot resonator.
  • To develop a highly sensitive on-chip volume refractometer using the novel cavity structure.

Main Methods:

  • Designed a microcavity using two cylindrical Bragg micromirrors for beam confinement.
  • Integrated external fiber rod lenses (FRLs) for input and output coupling.
  • Employed Gaussian-optics equations for device modeling and design criteria.
  • Utilized mixtures of ethanol and deionized water to test refractometer sensitivity.

Main Results:

  • Achieved a quality factor exceeding 9800 for the on-chip Fabry-Pérot resonator.
  • Demonstrated a high sensitivity of approximately 1000 nm/refractive index unit (RIU) for the refractometer.
  • Validated the device's performance as a micro-opto-fluidic refractometer using varying analyte concentrations.
  • Gaussian-optics modeling provided a more realistic performance prediction compared to ray-optics.

Conclusions:

  • The novel Fabry-Pérot microcavity structure offers superior performance in terms of quality factor and sensitivity.
  • This design overcomes limitations of previous Fabry-Pérot resonators and refractometers.
  • The device shows significant potential for advanced micro-opto-fluidic sensing applications.