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Spectral Characteristics Simulation of Topological Micro-Nano Structures Based on Finite Difference Time Domain
Xiaoran Ma1,2, Bairui Du1,2, Shengwang Tan1,2
1Strong-Field and Ultrafast Photonics Lab, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China.
Nanomaterials (Basel, Switzerland)
|October 23, 2021
Summary
Researchers simulated micro-nano gratings on gold surfaces to control spectral selectivity. Varying grating parameters, like period and depth, allows for precise tuning of absorption peaks for spectral regulation applications.
Area of Science:
- Nanotechnology
- Optics
- Materials Science
Background:
- Natural structural colors demonstrate the potential of micro-nano structures for spectral control.
- Designing and fabricating such structures is key to harnessing spectral characteristics.
Purpose of the Study:
- To simulate and analyze the spectral selectivity of micro-nano gratings on an gold (Au) surface.
- To investigate how physical parameters of the grating affect spectral response to incident light.
Main Methods:
- Utilized the finite difference time domain (FDTD) method for numerical simulation.
- Analyzed spectral response by varying grating depth, period, and depth-width ratio.
Main Results:
- Shallow gratings show redshift in absorption peaks for TM-polarized light with increased grating period.
- High depth-width ratio gratings exhibit a linear redshift in reflection spectrum absorption peaks with increasing grating period for TE-polarized light.
- A one-to-one correspondence was found between absorption peak wavelength and grating period.
- Selective absorption peaks were observed for TM-polarized light at specific grating periods (e.g., 0.4 μm period yielded peaks at 0.7, 0.95, and 1.55 μm).
Conclusions:
- Simulation results provide a theoretical foundation for creating micro-nano structures with tunable spectral properties.
- These findings support the practical application of spectral regulation using engineered nanostructures.
