A flat lens based on subwavelength periodic metal meshes has been developed using photolithographic techniques. These mesh grids are stacked at specific distances and embedded in polypropylene. A code was developed to optimize more than 1000 transmission line circuits required to vary the device phase shift across the lens flat surface, mimicking the behavior of a classical lens. A W-band mesh-lens prototype was successfully manufactured and its RF performance characterized using a vector network analyzer coupled to corrugated horn antennas. Co-polarization far-field beam patterns were measured and compared with finite-element method models. The excellent agreement between data and simulations validated our designing tools and manufacturing procedures. This mesh lens is a low-loss, robust, light, and compact device that has many potential applications including millimeter wave quasi-optical systems for future cosmic microwave background polarization instruments.
© 2013 Optical Society of America
Instrumentation, Measurement, and Metrology
Original Manuscript: November 27, 2012
Revised Manuscript: February 27, 2013
Manuscript Accepted: February 27, 2013
Published: April 3, 2013
Giampaolo Pisano, Ming Wah Ng, Fahri Ozturk, Bruno Maffei, and Vic Haynes, "Dielectrically embedded flat mesh lens for millimeter waves applications," Appl. Opt. 52, 2218-2225 (2013)