Focusing properties of Gaussian beams by a slab of Kerr-type left-handed metamaterial.
Kerr-type left-handed metamaterial (LHM) slab is proved to have an effect of focusing paraxial Gaussian beams and changing their waist radius, as conventional lens can do. The expressions for the focusing distance and the spot radius at the focal point are derived by the variational approach. We show that the incident Gaussian beams can be compressed or expanded by a single Kerr LHM slab, according to the sign of the Kerr nonlinearity and the divergence of the incident beam. Especially, it is demonstrated the focusing properties are significantly tuned by the slab thickness, the beam power and the divergence of the incident Gaussian beam.
School of Computer and Communication, Hunan University, Changsha 410082, China.
Yonghua
Y
Hu
Shuangchun
S
Wen
Hui
H
Zhuo
Kaiming
K
You
Dianyuan
D
Fan
D003198:Computer Simulation; D007536:Isomerism; D008027:Light; D008029:Lighting / Q000379:methods*; D008962:Models, Theoretical; D016011:Normal Distribution; D012542:Scattering, Radiation