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Nano-displacement sensor based on photonic crystal fiber modal interferometer
Optics Letters
|February 14, 2015
Summary
A novel photonic crystal fiber (PCF) modal interferometer enables stable, nanometer-level displacement sensing. This compact sensor achieves high resolution by incorporating a reflecting target to enhance interference patterns.
Area of Science:
- Optics and Photonics
- Fiber Optic Sensors
- Nanotechnology
Background:
- Modal interferometry in photonic crystal fibers (PCF) offers potential for sensitive measurements.
- Existing displacement sensors often face limitations in stability and resolution.
- Large mode area PCF provides unique modal properties for sensor development.
Purpose of the Study:
- To present a stable nano-displacement sensor utilizing a PCF modal interferometer.
- To demonstrate enhanced displacement resolution through a novel cavity design.
- To investigate the sensitivity and stability of the proposed sensor.
Main Methods:
- Fabrication of a compact sensor by splicing a large mode area PCF with a single mode fiber (SMF).
- Utilizing a reflecting target to create an external cavity, discretizing the interference pattern.
- Characterizing sensor performance, including stability and displacement resolution.
Main Results:
- The sensor achieved nanometer-level displacement resolution.
- A high sensitivity of 32 pm/nm was recorded.
- The modal interferometric sensor demonstrated high stability.
Conclusions:
- The proposed PCF modal interferometer with a reflecting target is a viable platform for stable nano-displacement sensing.
- The compact and simple design facilitates practical implementation.
- The sensor's high sensitivity and resolution open possibilities for various precision measurement applications.
