Synthesized Acoustic Vortex-Frequency Comb via Rotational Doppler Effect
The synergistic control of light's frequency and orbital angular momentum (OAM) via integrated nonlinear ring microresonators is crucial for creating spatiotemporal optical waveforms and advancing optical metrology. A direct analog of this capability in acoustics is challenging due to the nonlinearity-based mechanisms' dependence on external driving and limited frequency conversion efficiency. Here, we present an acoustic synthesized comb structure derived from spatiotemporal metasurfaces, concurrently controlling frequency and OAM characteristics with high conversion efficiency and removing the constraints of critical driving frequency and power level in nonlinear mechanisms. By optimizing comb structures, energy distributions among OAM modes are adjusted to different frequency lines. We finally propose spatiotemporal metalens devices based on vortex-frequency combs, enabling synchronously multiple-order spatial differential operations for parallel data processing. This Letter is groundbreaking in integrating spectral- and spatial-domain acoustic waves, promising multifunctional imaging and advantages in spatiotemporal beams.
Authors
- Da‐Jian Wu (ORCID: https://orcid.org/0000-0003-2034-9077)
- Yurou Jia (ORCID: https://orcid.org/0000-0002-1776-0706)
- Hong‐Tao Zhou (ORCID: https://orcid.org/0000-0002-9813-3279)
- Yechao Bai (ORCID: https://orcid.org/0000-0001-5244-674X)
- Ying Cheng (ORCID: https://orcid.org/0000-0002-9140-4742)
- Taoyu Chen (ORCID: https://orcid.org/0000-0002-8966-1264)
- Suying Zhang (ORCID: https://orcid.org/0000-0002-9243-7933)
- Guoqiang Xu (ORCID: https://orcid.org/0000-0002-8729-0287)
- Cheng‐Wei Qiu (ORCID: https://orcid.org/0000-0002-6605-500X)
- Xiaojun Liu (ORCID: https://orcid.org/0000-0003-3399-3486)
- Xuan Zhang (ORCID: https://orcid.org/0009-0001-9856-1812)
Institutions
- Nanjing Normal University (CN)
- Tianjin University (CN)
- National University of Singapore (SG)
- Collaborative Innovation Center of Advanced Microstructures (CN)
- Nanjing University (CN)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-03-31
- DOI
- https://doi.org/10.1103/physrevlett.134.137001
- Citations
- 4
- Primary Topic
- Orbital Angular Momentum in Optics
- Type
- article
- Field-Weighted Citation Impact
- 4.99
Funders
- National Natural Science Foundation of China
- China Scholarship Council
- Natural Science Foundation of Jiangsu Province
- Graduate Research and Innovation Projects of Jiangsu Province
- National Key Research and Development Program of China