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Spatially localized wavelength-selective absorption in morphology-modulated semiconductor nanowires
Optics Express
|October 19, 2017
Summary
Morphology-modulated silicon nanowires (NWs) with hexagonal cross-sections show tunable optical absorption and scattering. Diameter-modulated NWs exhibit unique resonant modes for localized light absorption in nanophotonic circuits.
Area of Science:
- Nanophotonics
- Optical Metamaterials
- Semiconductor Nanostructures
Background:
- Silicon nanowires (NWs) are crucial for nanoscale optoelectronics.
- Controlling optical properties of NWs is essential for advanced photonic devices.
- Morphological control offers a pathway to tailor resonant light interactions.
Purpose of the Study:
- To investigate the optical absorption and scattering of morphology-modulated silicon NWs.
- To explore the influence of aspect ratio (AR) on optical resonances.
- To design and analyze diameter-modulated NWs for localized light absorption.
Main Methods:
- Numerical investigation of optical properties.
- Simulation of resonant absorption and scattering spectra.
- Design of NWs with varying aspect ratios and periodic diameter modulations.
Main Results:
- Optical resonances controlled by NW aspect ratio.
- Observed resonant peak shifts and asymmetric scattering spectra.
- Identified grating and 3D cavity modes in diameter-modulated NWs.
Conclusions:
- Morphology-modulated Si NWs offer tunable optical properties.
- Diameter-modulated NWs demonstrate unique resonant behaviors.
- These NWs are promising for nanoscale light absorption and detection in nanophotonics.
