1、1 T-TST-REG-12-2022-00205_final_ThomasSNowack T-TST-REG-12-2022-00205_final_ThomasSNowack 10 kcm)was chosen for both the substrate and pillars because of its high refractive index of 3.418 refractive index units(RIU)31 and transparency at the design wavelength?0 of 118.8 m.Fig.1(a)and(b)shows the fa

2、bricated metasurface with its optimized unit cell,respectively.The polar plot of Fig.1(c)summarizes simulation results of the unit cell for different pillar geometries.Each data point This article has been accepted for publication in IEEE Transactions on Terahertz Science and Technology.This is the

3、authors version which has not been fully edited and content may change prior to final publication.Citation information:DOI 10.1109/TTHZ.2023.3263648 2023 IEEE.Personal use is permitted,but republication/redistribution requires IEEE permission.?See https:/www.ieee.org/publications/rights/index.html f

4、or more information.Authorized licensed use limited to:University of Glasgow.Downloaded on April 01,2023 at 10:43:14 UTC from IEEE Xplore.Restrictions apply.3 T-TST-REG-12-2022-00205_final_ThomasSNowack represents the complex transmission(radial distance|?|=?,?,polar angle?=?,?)of a specific pillar

5、geometry(?,?)for incident?-and?-polarized light(blue squares and orange crosses,respectively).The imparted phase shifts?,?span a full phase period of?,+?while the transmission?,?remained high and uniform at an average value of 86.9%6.4%for both polarizations,close to optimal performance(green circle

6、).The metasurface was designed to produce an extended focal line in which the SoP changes linearly as a function of the distance along the optical axis?.This was done by encoding two spatial phase functions?1,2(?,?)that are independently excited by an OPP,in our case by incident|?or|?polarized light