Dependence Of SPs' Effect On Unit Structure Edge Sharp Features Of Subwavelength Metal Hole Arrays

The phenomenon of the Enhanced Optical Transmission(EOT) is an important research topics in the field of Plasmonics, which arise in the periodic subwavelength hole arrays. It has some important application values in the field of micro/nano photonics, communication,energy, military. 3D finite-difference time-domain(FDTD)is employed to study the influence of unit structure features on SPs' effect in the interaction between light and periodic subwavelength metal film micro structure in order to study the internal physical mechanism of EOT phenomenon. The main works are as follows:(1) The properties of enhanced optical transmission of periodic subwavelength triangle metallic film hole arrays which were deposited on a glass substrate was calculated numerically using 3D finite-difference time-domain method. The results show that the EOT phenomenon of triangle metal film hole arrays is major influenced by SPs' effect which is excited on the surface of metallic films. The transmission peak in visible wavelengths range is influenced by SPPs mode which is excited by the periodic of the unit structure. The transmission peak in infraredwavelengths range is influenced by LSP resonance mode which is excited in the inner hole. The EOT properties of periodic subwavelength metallic film hole arrays are influenced by parameters of unit structure, such as,the polarization of incident light, hole shape, periodic of hole arrays, hole size and film thickness.(2) The properties of enhanced optical transmission of periodic subwavelength circular-sharps metallic film hole arrays which were deposited on a glass substrate was calculated numerically using 3D finite-difference time-domain method. The results show that the unit structure edge sharps influence the SPs' effect. The sharp acuity and numbers affect the abilities of hole arrays that excite LSP resonance mode,so that affect the EOT properties. The different sharp distributions are equal to the effect of polarization properties on the influence of EOT.When the light with 0 degree polarization angle, the value of the normalized transmission peak is smallest when sharps are distributed along polarized axis, and the value of the normalized transmission peak is biggest when sharps are distributed perpendicular to polarized axis, along with appearing red shift.The influence of unit structural features of periodic subwavelength metal film hole arrays on SPs' effect was studied in this paper. The properties of the optical transmission could be tailored by changing the unit structural features, this conclusion could provide theoretical guidancefor building the various functions of new SPs devices.