研究目的
Investigating the dependence of the Belinfante momentum transfer to particles in the evanescent field of waveguides on the polarization state of light within the waveguide, and developing a minimally invasive method to probe the polarization state inside photonic chips.
研究成果
The study demonstrates that the lateral force acting on a Mie particle in an evanescent field depends in a non-trivial way on the resonance dynamics of those particles, allowing for the retrieval of the polarization state of light inside waveguides. This method provides a local, minimally invasive way to probe the polarization within a photonic chip, with potential applications in optical communication systems.
研究不足
The study does not include the effects of the trapping beam used to position the probe particles close to the surface, which could influence the dynamics of the probe particle. Additionally, the effects of multiple reflections between the particle and the surface of the waveguide are neglected, which could give second-order contributions to evanescent field optical forces.
1：Experimental Design and Method Selection:
The study involves theoretical and numerical analysis of the optical forces acting on particles in an evanescent field, extending the formalism derived in previous work to permit arbitrary incident polarizations of light. Mie theory is used to evaluate the scattered fields of the dielectric sphere and calculate the forces directly from the Mie scattering coefficients.
2：Sample Selection and Data Sources:
The analysis considers silicon nanoparticles of varying sizes (100 nm to 350 nm radius) in the vicinity of an evanescent field generated by a waveguide. The incident light is modeled with a Gaussian beam profile.
3：List of Experimental Equipment and Materials:
Silicon nanoparticles, waveguides, and a Gaussian beam source are the primary materials. The simulations are performed using COMSOL for full-wave numerical simulations.
4：Experimental Procedures and Operational Workflow:
The study starts with a single interface between dielectric media, then adds additional interfaces to simulate the force generated above a realistic waveguide. The forces acting on particles are calculated as a function of the polarization state of the evanescent field and the optical properties of the particles.
5：Data Analysis Methods:
The lateral force's dependence on the particle's resonance dynamics is analyzed, and the polarization state inside the waveguide is reconstructed based on the equilibrium positions of particles of different sizes.
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