Tunable Acoustic Gradient Index Lens for Fast Axail Scanning Photoacoustic Microscopy

Optical-resolution Photoacoustic microscopy (OR-PAM) can provide optical resolution absorption contrast by using optical focusing. However, the diffraction limits of optical focus restrict the field of view along the depth direction of OR-PAM. In this paper, the fabrication of the tunable acoustic gradient index lens(TAG) lens was demonstrated. And the performance of the TAG lens was also shown. Our results indicated that the TAG lens could be used in OR-PAM to break the limitation of the field of view in depth direction.