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Study on Spectral Selective Manipulation Characteristics of Surface Multilevel Micro-Nano Structures by FDTD
Xiangjing Guo1,2, Haiying Song1,2, Bairui Du1,2
1Strong-Field and Ultrafast Photonics Lab, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China.
This study simulates micro-nano optical filters, demonstrating how structural parameters like period and diameter control wavelength selectivity. Adjusting these features allows precise tuning of reflectivity and transmittance for advanced optical filter design.
Area of Science:
- Materials Science
- Optical Engineering
- Nanotechnology
Background:
- Micro-nano structures on material surfaces are crucial for optical filters used in diverse applications.
- Wavelength selectivity in these filters is achieved by tuning fabrication parameters of micro-nano array structures.
Purpose of the Study:
- To simulate and analyze the spectral properties of periodic micro-nano array structures on gold surfaces.
- To investigate how different structural parameters influence the reflectivity and transmittance of optical filters.
Main Methods:
- Utilized the finite-difference time-domain (FDTD) method for spectral property simulations.
- Analyzed periodic pore, cylindrical, and ring array structures on gold surfaces.
Main Results:
- Periodic pore arrays directionally modulate reflectivity and transmittance.
- Wavelength selection ability increases with array period interval distance, narrowing transmission peak linewidth.
- Cylindrical array structure period influences spectral peaks; increasing period causes red-shift.
- Ring array structures show red-shifted reflection peaks with increasing inner diameter and decreasing ring width.
Conclusions:
- Simulation results provide a foundation for fabricating future optical filters.
- Controlling micro-nano surface structures offers new avenues for spectral characteristic manipulation.
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