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Updated: Sep 18, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

Acoustic Metasurface for Space-time Reflection Manipulation.

Yunhan Yang^1,2, Han Jia^2,3, Jiuyang Lu⁴

¹Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100190, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|June 26, 2025

Summary

This summary is machine-generated.

Researchers developed a novel space-time acoustic metasurface (STAM) for advanced sound modulation. This technology enables precise control over sound waves, paving the way for new acoustic applications.

Keywords:

acoustic metasurface direction‐of‐arrival estimation space‐time modulation waterborne sound manipulation

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Area of Science:

Acoustics and Materials Science
Wave Engineering
Metasurface Technology

Background:

Traditional sound modulation systems are limited by bulky structures and restricted space-time control.
Existing methods struggle to achieve dynamic sound-matter interactions.
Advancements in wave engineering necessitate novel approaches beyond static systems.

Purpose of the Study:

To propose and implement a prototype space-time acoustic metasurface (STAM).
To demonstrate precise control over waterborne acoustic waves using spatiotemporal phase programming.
To explore applications of STAM in advanced signal processing, such as direction-of-arrival estimation.

Main Methods:

Implementation of a reflective piezoelectric array controlled by a field-programmable gate array.
Utilizing spatiotemporally programmable phases for acoustic wave manipulation.
Experimental demonstration of Doppler-like chirp modulation and deterministic frequency/momentum shifts.

Main Results:

Successful experimental achievement of Doppler-like chirp modulation in waterborne acoustic waves.
Demonstration of space-time modulation with deterministic frequency and momentum shifts.
Introduction of a stochastic space-time modulation method with successful application in direction-of-arrival estimation.

Conclusions:

The proposed STAM offers a flexible and efficient platform for advanced sound modulation.
This technology overcomes limitations of traditional bulky structures.
The STAM extends the capabilities of wave control, enabling versatile space-time acoustic applications.