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Dipole and quadrupole trapped modes within bi-periodic silicon particle array realizing three-channel refractive
Optics Express
|January 22, 2015
Summary
This study numerically investigated trapped modes in silicon particle arrays, revealing three distinct modes that create sharp Fano profiles. These modes enable a sensitive three-channel refractive sensor with tunable properties.
Area of Science:
- Photonics and optical metamaterials
- Computational electromagnetics
- Nanophotonics
Background:
- Bi-periodic particle arrays exhibit complex optical resonances.
- Fano resonances offer sharp spectral features crucial for sensing applications.
Purpose of the Study:
- To numerically study trapped modes in bi-periodic silicon particle arrays.
- To analyze the generation of Fano profiles and their potential for sensing.
Main Methods:
- Finite difference time domain (FDTD) method.
- Finite element method (FEM).
Main Results:
- Identified three distinct trapped modes arising from anti-phased electric dipole, magnetic dipole, and magnetic quadrupole resonances.
- Observed three sharp asymmetric Fano profiles in reflection due to interactions with bright modes.
- Demonstrated tunable linewidth and 100% modulation depth by adjusting particle radius.
- Achieved high sensitivities for a three-channel refractive sensor: 155 nm/RIU, 725 nm/RIU, and 190 nm/RIU.
Conclusions:
- Bi-periodic silicon particle arrays support tunable trapped modes.
- These modes enable the creation of high-performance Fano-based refractive index sensors.
