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Analysis of low F-number dual micro-axilens array with binary structures by rigorous electromagnetic theory
Di Feng1, Li-Shuang Feng, Chun-Xi Zhang
1Department of Electro-Optical Engineering, School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China. fengdi@tsinghua.org.cn
Optics Express
|June 7, 2011
Summary
This study analyzes binary dual micro-axilens arrays (BDMAs), finding their focal properties depend on incident wave polarization. Increasing the F-number enhances diffraction efficiency and reduces focal spot size for BDMAs.
Area of Science:
- Optics and Photonics
- Micro-optics
- Electromagnetic Theory
Background:
- Micro-axilens arrays are crucial for integrated micro-optical systems.
- Binary structures offer fabrication advantages for micro-optical elements.
Purpose of the Study:
- To investigate the focal characteristics of a two-dimensional low F-number dual micro-axilens array (BDMA) with binary structures.
- To analyze the impact of F-number, incident polarization, and element spacing on BDMA performance.
Main Methods:
- Rigorous electromagnetic theory was employed for analysis.
- Focal characteristics including axial (depth, shift) and transverse (spot size, efficiency) performances were evaluated.
- Simulations were conducted for varying F-numbers, TE/TM polarizations, and micro-axilens distances.
Main Results:
- The interference effect in BDMAs is minimal, enabling high fill factors.
- BDMA focal characteristics are sensitive to incident wave polarization.
- Increasing the F-number improves diffraction efficiency and reduces focal spot size for both TE and TM polarizations.
Conclusions:
- The findings provide insights into designing highly integrated micro-optical elements.
- Polarization sensitivity must be considered in BDMA applications.
- Optimizing F-number is key to enhancing BDMA performance.
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