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Updated: May 20, 2026
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Three-dimensional Optical-resolution Photoacoustic Microscopy
Published on: May 3, 2011
Multifrequency achromatic metalens realizing acoustic multi-point focusing.
Jie Yao1, Xing Chen1, Shu-Ming Dong1
1Institute of Acoustics, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China.
The Journal of the Acoustical Society of America
|May 19, 2026
Summary
This study introduces a novel multifrequency achromatic metalens capable of generating multiple focal points. This breakthrough expands beyond single-point focusing, offering new possibilities for optical systems.
Area of Science:
- Optics and Photonics
- Metamaterials
- Wavefront Engineering
Background:
- Traditional achromatic focusing techniques primarily concentrate on single-point focusing.
- The potential applications of multi-point focusing in optical systems remain underexplored.
Purpose of the Study:
- To propose and demonstrate a multifrequency achromatic metalens for achieving multiple focal points.
- To explore the use of complex-amplitude coding for wavefront shaping in metalenses.
Main Methods:
- Decomposition of the complex-valued wavefront-shaping function into two independent phase distributions.
- Coding of phase distributions into a metalens using subwavelength units to achieve phase dispersion for multi-point focusing.
- Experimental construction and testing of a triple-frequency achromatic metalens using space-curved structures.
Main Results:
- Demonstration of achromatic multi-point focusing at discrete frequencies.
- Successful construction of a triple-frequency achromatic metalens.
- Experimental validation of three achromatic focal points at 3.5, 4, and 5 kHz.
Conclusions:
- The proposed complex-amplitude coding method enables achromatic multi-point focusing.
- The design offers flexibility, as coding sequences minimally impact the focal pattern.
- This work advances metalens technology for applications requiring multiple focal points at different frequencies.
