Reflection based Extraordinary Optical Transmission Fiber Optic Probe for Refractive Index Sensing

Area of Science:

• Optoelectronics
• Nanophotonics
• Chemical Sensing

Background:

• Extraordinary optical transmission (EOT) enables unique light-matter interactions.
• Fiber optic sensors offer remote and real-time monitoring capabilities.
• Subwavelength nanostructures are crucial for advanced optical phenomena.

Purpose of the Study:

• To design and fabricate a fiber optic probe for chemical sensing.
• To leverage the EOT phenomenon for refractive index sensing.
• To develop a compact and sensitive sensor for practical applications.

Main Methods:

• Fabrication of subwavelength hole arrays on gold-film-coated optical fiber endfaces.
• Utilizing the EOT phenomenon for optical signal transduction.
• Characterizing sensor response to changes in surrounding refractive index.

Main Results:

• The fiber optic probe exhibited a red shift in response to increasing refractive index.
• High sensitivity of 573 nm/RIU was achieved in the 1.333–1.430 refractive index range.
• The sensor operates effectively in the near-infrared telecommunication wavelength range.

Conclusions:

• The developed fiber optic probe is a promising tool for refractive index sensing.
• The compact and simple configuration facilitates easy instrumentation.
• The EOT-based sensor offers high sensitivity and potential for various chemical sensing applications.