Fabry-Perot resonance on extraordinary transmission through one-dimensional metallic gratings with sub-wavelength under transverse electric wave excitation

Abstract

The transmission distribution of transverse electric wave (TE) through one-dimensional metallic gratings with sub-wavelenghth slits with dielectric added in different positions has been simulated by the FDTD (finite difference time domain) method, the extraordinary transmission can be produced at several special wavelengths. The simulation shows that the guided-mode-like resonance theory is the main reason giving rise to the first peak and the second peak. Based on the guided-mode-like resonance theory, from the Maxwell’s equations,we nade sure that the Fabry Perot resonance is the main cause producing the third peak by the effective index mehod. In a word, the guided-mode resonance theory and the Fabry-Perot-like resonance reveal the physical nature of the extraordinary transmission phenomenon which provides a complete theoretical basis for further study of the extraordinary transmission phenomenon of TE-polarized wave.

Research on polarizing properties of integrated double-layer subwavelength grating in mid-wave infrared

“…Increasing substrate thickness, the wavelength of the TM polarization transmittance peak shifts to the right. This can be explained according to F-P-like resonance theory, for TM wave, when + = 2 ( = ℎ 1 + ℎ 2 , N is a positive integer, λg is the wavelength) [11], the polarization transmittance reaches its maximum value. In addition, it can be seen from the formula that the length of the F-P-like cavity is also affected by the grating substrate δ, that is, adding a substrate to the grating will make the cavity length longer.…”

The Influence of Substrate on the Optical Properties of Gold Nanoslits

“…Novel spoof surface plasmon polaritons (SPPs) in perfect electrical conductors have been identified as an alternative mechanism for achieving EOT, extending its applicability beyond transverse magnetic (TM) modes [18][19][20]. Initially attributed to the presence of surface plasmon polaritons (SPPs), which are predominantly excited by transverse magnetic (TM) waves, recent studies have demonstrated the possibility of EOT for transverse electric (TE) waves as well [21][22][23][24][25][26]. Notably, some researchers have successfully realized EOT in configurations that accommodate both TM and TE waves at the same wavelength, as supported by theoretical analyses, numerical simulations, and experimental observations [27][28][29].…”