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New design model for high efficiency cylindrical diffractive microlenses.

Ye Li1, Huan Zhao1, Sheng-Fei Feng2

  • 1Department of Physics, Capital Normal University, Beijing Key Laboratory of Metamaterials and Devices, Beijing Advanced Innovation Center for Imaging Technology, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing, 100048, P. R. China.

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|November 29, 2017
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Summary
This summary is machine-generated.

A new decreasing thickness model (DTM) enhances cylindrical diffractive microlenses (CDMs) design. This model improves focal efficiency and shrinks focal spot size compared to the traditional equal thickness model (ETM), verified by simulations and experiments.

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Area of Science:

  • Optics and Photonics
  • Micro-optics Design
  • Diffractive Optical Elements

Background:

  • Cylindrical diffractive microlenses (CDMs) are crucial optical components.
  • Traditional design methods like the equal thickness model (ETM) have limitations in optimizing focal performance.
  • Enhancing focal efficiency and reducing focal spot size are key objectives in microlens design.

Purpose of the Study:

  • To introduce and evaluate a novel decreasing thickness model (DTM) for designing CDMs.
  • To theoretically investigate and experimentally verify the focal performance improvements offered by the DTM.
  • To compare the DTM with the conventional ETM for CDM design.

Main Methods:

  • Developing the decreasing thickness model (DTM) for CDM design.
  • Solving Maxwell's equations using the boundary element method (BEM) for theoretical analysis.
  • Conducting experimental measurements to validate simulation results.

Main Results:

  • The DTM significantly improves the focal performance of CDMs compared to the ETM.
  • Simulations show heightened focal efficiency and a shrunk focal spot size with the DTM.
  • Experimental results confirm the theoretical predictions, with improvements being more pronounced for higher numerical aperture CDMs.

Conclusions:

  • The proposed decreasing thickness model (DTM) offers superior performance for designing cylindrical diffractive microlenses (CDMs).
  • DTM leads to enhanced focal efficiency and reduced focal spot size, outperforming the traditional ETM.
  • The findings are validated experimentally, highlighting the practical applicability of the DTM, especially for high numerical aperture applications.