New paper in Optics Letters describes Zoom Metalens

UK graduate Students Fatih Balli and Mansoor Sultan recently published their work on variofocal ("zoom") metalenses in Optics Letters.  Metalenses replace traditional bulky glass optics with thin, lightweight, patterned surfaces.  The metalens discussed in this paper consists of two "flat" optical elements whose mutual rotation allows the focal length to be adjusted.  The metalenses were fabricated using two-photon lithography, a type of nanoscale 3D printing. The work represents a first step toward building ultrathin, lightweight zoom lenses for mobile applications.

The paper, entitled "Rotationally tunable varifocal 3D metalens," can be found at https://doi.org/10.1364/OL.426661.