We study the transient behaviors in focusing a point source with a metamaterial lens (delta=µ=-1+delta). We find the time evolutions of image formation are dictated by two relaxation mechanisms, namely, surface wave transport and absorption, determined, respectively, by Re(delta) and Im(delta). We show that image oscillations are inevitable in this three-dimensional configuration when Re(delta) not equal to 0 and establish relationships among the relaxation time, the resolution enhancement, and delta.
© 2005 Optical Society of America
Lei Zhou and C. T. Chan, "Relaxation mechanisms in three-dimensional metamaterial lens focusing," Opt. Lett. 30, 1812-1814 (2005)