Ultrasound focusing with metamaterial

• 作者: Jianchun Cheng
• 来源期刊: 中国科学：物理学 力学 天文学（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: New & Views
• 页码范围: 125-126
• 页数: 2页
• 语种: 英文

摘要

Ultrasonic waves,although not audible,naturally exist at high frequencies.Ultrasound can be controlled and unitized in various scenarios.Well-known examples are bats and dolphins,which produce ultrasound and detect the reflected signal for navigating and hunting.Ultrasound is also widely used in biomedical imaging and therapy as it propagates inside the human body where electromagnetic waves cannot reach without causing radiation damage.Technologies in this field have matured considerably over the last century,but the foundation of this field still primarily lies in the focusing technique.The concentration of ultrasound energy leads to high intensity in a small region,is a precondition for ultra-sonic lithotripsy.Meanwhile,the compact spatial distribution also allows for imaging with a high resolution.