All-Optical Nanosensor for Displacement Detection in Mechanical Applications

Area of Science:

• Photonics and Nanotechnology
• Optical Sensing
• Infrared Optics

Background:

• Traditional displacement sensors face limitations in sensitivity and complexity.
• All-optical sensing offers potential for enhanced precision and miniaturization.
• Silicon nanowires exhibit unique optical resonance properties suitable for sensing applications.

Purpose of the Study:

• To design and simulate an all-optical displacement sensor based on parallel silicon nanowires.
• To analyze the optical resonance behavior and sensitivity of the proposed sensor design.
• To explore the potential of this system for infrared light detection and displacement measurement.

Main Methods:

• Utilizing COMSOL Multiphysics software for finite element method (FEM) simulations.
• Designing a system with two parallel suspended silicon nanowires with optimized diameter (140 nm).
• Analyzing the effects of varying inter-nanowire distance on optical resonances at 1064 nm and 1310 nm.

Main Results:

• Optimized nanowire diameter (140 nm) achieved resonances at target infrared wavelengths (1064 nm and 1310 nm).
• Detectable changes in resonant behavior and optical interaction were observed with variations in nanowire distance.
• High sensitivities of 1.1 × 10^6 V/m^2 and 1.14 × 10^6 V/m^2 were achieved at 1064 nm and 1310 nm, respectively.

Conclusions:

• The proposed silicon nanowire system functions as a highly sensitive all-optical displacement sensor.
• The design leverages infrared optical resonances for efficient light confinement and scattering.
• This approach offers a promising alternative for developing advanced optical displacement sensors.