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

Volume

5

Issue

2

fYear

2013

fDate

41365

Firstpage

2200907

Lastpage

2200907

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;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2013.2252333

Filename

6480776