Title :
A Chirped Subwavelength Grating With Both Reflection and Transmission Focusing
Author :
Xiaomin Lv ; Weibin Qiu ; Jia-Xian Wang ; Yuhui Ma ; Jing Zhao ; Mengke Li ; Hongyan Yu ; Jiaoqing Pan
Author_Institution :
Coll. of Inf. Sci. & Eng., Huaqiao Univ., Xiamen, China
Abstract :
A planar lens composed of a chirped subwavelength grating (CSG) structure with high numerical aperture (NA) was designed and analyzed in this paper. The reflectivity, transmission, and phase were calibrated as a function of the grating dimension using rigorous coupled wave analysis, while the focusing properties were numerically simulated by finite-element method. The designed CSG focused the reflected and transmitted waves that have approximately the same power ratios simultaneously. Numerical aperture values of the planar lens as high as 0.91 and 0.92 were obtained for normal incidence of TM and TE polarization light, respectively.
Keywords :
diffraction gratings; finite element analysis; lenses; light polarisation; light reflection; optical focusing; TE polarization light; TM polarization light; chirped subwavelength grating; coupled wave analysis; finite-element method; grating dimension; numerical aperture; numerically simulated; planar lens; reflected waves; reflection focusing; transmission focusing; transmitted waves; Focusing; Gratings; Lenses; Materials; Mirrors; Reflection; Reflectivity; Subwavelength; double focusing; grating;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2013.2252333
