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Fano resonance in all-dielectric binary nanodisk array realizing optical filter with efficient linewidth tuning.
Optics Express
|April 4, 2015
Summary
This study explores Fano resonance in binary silicon nanodisk arrays, demonstrating tunable optical filters. The findings show precise control over linewidth and Q factor by adjusting particle size, promising practical applications.
Area of Science:
- Photonics and Nanophotonics
- Optical Metamaterials
Background:
- Fano resonance arises from the interaction of in-phase and anti-phase lattice collective resonances.
- Binary silicon nanodisk arrays support these coupled resonances.
Purpose of the Study:
- Investigate Fano resonance in binary silicon nanodisk arrays.
- Demonstrate the tunability of optical filter properties.
Main Methods:
- Experimental characterization of Fano resonance.
- Finite-difference time-domain (FDTD) numerical simulations.
- Analysis of Fano lineshape dependence on nanodisk radius difference.
Main Results:
- Observed strong dependence of Fano lineshapes on the radius difference of nanodisks.
- Demonstrated linewidth tuning from 12 nm to 0.7 nm.
- Achieved Q factor enhancement from 72 to 1290 by increasing particle radius R(2).
Conclusions:
- Binary silicon nanodisk arrays function as effective optical filters.
- Linewidth and Q factor are efficiently tunable by altering particle radius.
- The proposed scheme is promising for practical applications due to ease of fabrication, simulation, and tuning.
