光声转换是指利用光声效应产生声音的过程。脉冲光可以激发光声材料产生高频、宽带超声信号。金属纳米结构具有局域表面等离子体共振效应,因此具有高光学吸收和可调控性,是一种重要的光声转换材料,广泛应用在生物医学成像等领域。介绍光声转换的主要机制和原理,总结金纳米棒、金纳米圆盘、金纳米阵列等金属纳米材料的光声转换研究及应用进展,并对金属纳米光声材料的未来发展方向进行了展望。

Photoacoustic conversion refers to the process of using photoacoustic effect to produce sound. High frequency and wide band ultrasonic signals can be generated by stimulating photoacoustic materials with pulsed light. Metal nanostructures generate localized surface plasmon resonance and therefore have high optical absorption and controllability, so that they can be used as important photoacoustic conversion materials and can be applied to biomedical imaging and other fields. In this paper, the mechanisms and principles of the photoacoustic conversion are firstly introduced. Then the research and application progresses of photoacoustic conversion of metal nanostructures such as gold nanorods, gold nanodisks, and gold nanoarrays are summarized. Finally, the possible future development directions of metal photoacoustic nanomaterials are prospected.