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Dual-demodulation large-scope high-sensitivity refractive index sensor based on twin-core PCF.

Chen-Yuan Li1, Bin-Bin Song1, Ji-Xuan Wu2

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Summary

This study presents a novel twin-core photonic crystal fiber (TC-PCF) sensor for refractive index (RI) detection. The TC-PCF achieves high RI sensing sensitivity across a broad range, offering dual-parameter demodulation for enhanced biochemical sensing applications.

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Area of Science:

  • Photonics and Optical Sensing
  • Materials Science
  • Biochemical Detection

Background:

  • Refractive index (RI) sensors are crucial for biochemical detection.
  • Photonic crystal fibers (PCFs) offer unique properties for sensing applications.
  • High birefringence and low confinement loss are desirable for enhanced sensor performance.

Purpose of the Study:

  • To theoretically investigate a twin-core photonic crystal fiber (TC-PCF) for RI sensing.
  • To analyze the evolution of birefringence and operating wavelength with varying RI.
  • To demonstrate dual-parameter demodulation for improved RI sensing sensitivity.

Main Methods:

  • Theoretical study of a TC-PCF with a rectangular array in the core.
  • Simulation of birefringence and operating wavelength characteristics.
  • Analysis of RI sensing sensitivity for RI values from 1.33 to 1.41.

Main Results:

  • The proposed TC-PCF exhibits high birefringence and low confinement loss from 0.6 µm to 1.7 µm.
  • Opposite evolutions of change rates between birefringence (B) and wavelength were observed.
  • Maximum RI sensing sensitivities of 1.809×10-2 B/RIU and 8700 nm/RIU were achieved at low and high RI, respectively.

Conclusions:

  • The TC-PCF sensor demonstrates high RI sensing sensitivity over a wide RI range (1.33-1.41).
  • Dual-parameter demodulation optimizes sensitivity, particularly for low RI detection.
  • The sensor shows significant potential for biochemical sensing and detection applications.