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Fabrication and characterization of a binary diffractive lens for controlling focal distribution
Applied Optics
|April 1, 2020
Summary
Researchers created a binary diffractive lens to precisely control light focusing. Adjusting the lens’s periodic structure allows for tunable focal length and depth of focus, enabling tailored light distribution.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Diffractive lenses offer precise control over light propagation.
- Tailoring focal properties is crucial for advanced optical systems.
Purpose of the Study:
- To investigate the fabrication of a binary diffractive lens for controlling focal distribution.
- To explore the relationship between lens structure and focal properties like focal length and depth of focus.
Main Methods:
- Fabrication of a binary diffractive lens with a variable ring zone interval (ΔRM).
- Experimental characterization of the lens's optical performance.
- Analysis of focal distribution, including intensity, peak position, and half-width.
Main Results:
- The focal length and depth of focus were successfully controlled by adjusting the ΔRM.
- An increase in ΔRM resulted in the optical axis peak position shifting further from the lens.
- The half-width in the propagation direction increased with increasing ΔRM.
Conclusions:
- Binary diffractive lenses provide a method for controlling focal distribution.
- Tunable optical properties can be achieved by modifying the periodic structure of flat lenses.
