Deep super-resolution direct laser writing using Gaussian-Bessel STED

The title is Deep Super-Resolution Direct Laser Writing Using Gaussian-Bessel STED. Authors are Ziyu Li, Jian Xu and Kebin Shi. Conventional STED systems using Laguerre-Gauss depletion beams suffer from severe spherical aberration due to the index mismatching between samples and optical system, leading to resolution degradation at deeper sample depths. This work proposes a Gauss-Bessel STED (GB-STED) system employing a first-order Bessel beam for depletion. These results showcase the superior super-resolution DLW capability of the GB-STED system at depth, opening new avenues for high-resolution laser nanofabrication.