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Xin Guo1, Limin Tong

  • 1Department of Optical Engineering, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University,Hangzhou 310027, China.

Optics Express
|September 17, 2008
PubMed
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Copper-rod-supported microfiber loops function as sensitive and stable refractive-index sensors. These robust sensors accurately measure refractive index in solutions of varying concentrations.

Area of Science:

  • Optoelectronics
  • Nanotechnology
  • Chemical Sensing

Background:

  • Refractive index sensing is crucial for various applications, including chemical analysis and diagnostics.
  • Microfiber loop resonators offer potential for high-sensitivity optical sensing.
  • Developing robust and stable sensor platforms remains a key challenge.

Purpose of the Study:

  • To demonstrate a novel refractive-index sensor utilizing copper-rod-supported microfiber loops.
  • To evaluate the sensitivity and stability of the proposed sensor for diverse concentration solutions.

Main Methods:

  • Fabrication of microfiber loops supported by copper rods.
  • Characterization of the optical properties and resonance behavior of the microfiber loops.
  • Testing the sensor's response to solutions with varying refractive indices and concentrations.

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Main Results:

  • The copper-rod-supported microfiber loops exhibited robust performance.
  • Critical coupling was achieved over a broad spectral range, enabling flexible sensing.
  • The sensor demonstrated high sensitivity and stability, with an estimated refractive-index sensitivity of up to 1.8 x 10(-5).

Conclusions:

  • Copper-rod-supported microfiber loops represent a promising platform for highly sensitive and stable refractive-index sensing.
  • The sensor's robustness and adaptability make it suitable for both low- and high-concentration measurements.
  • This technology has potential applications in real-time chemical monitoring and diagnostics.