Abstract
ABSTRACT Phase modulation characteristics of subwavelength metallic square holes are investigated for 2D imaging purpose. Based on Maxwell equations, the transmission model of three-dime nsion subwavelength metallic holes is founded by a mode expansion technique. The relationship between the widths of the holes and the phase from - S to S is established when the thickness of metallic film is given. Then the influences of coupling electromagnetic (EM) fields as well as the incident angle on phase retardation are investig ated and calculated through varying the center distance between double holes. A slab lens is demonstrated by using hole-array formed on a metallic film, which verifies the theoretic analysis. Keywords: phase retardation; coupling electromagnetic fields; slab lens INTRODUCTION Since Ebbesen et al. found extraordinary optical transmission (EOT) through sub-wavelength holes array made in a metal film 1,2 , the study of the transmission properties of subwavelen gth aperture has become a very active research area. Subsequently, H.J.Lezec et al. reported that the micro-scaled metallic structures, a single aperture surrounded by a periodic corrugation in the metal surface, transmit light with a combination of low divergence, directionality and high efficiency
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call