The transmission property of a subwavelength metallic slit with perpendicular groove is investigated by using finite
element method. The lengths for the slits at both sides of the groove are set as the length of a metallic slit without groove
at the surface plasmon fundamental mode resonance. In the grooved subwavelength metallic slit, enhanced transmission
is found to be attributed to two kinds of resonance including surface plasmon waveguide resonance along the
propagating direction and the transversely constructive interferential resonance. For the former resonance, integer
antinodes of surface plasmon are formed in the groove. For the later resonance, there is a tradeoff between the maximum
amplitude and the full width at half maximum of the transmitted peaks with the change of the groove width. And, the
transmission enhancement of the grooved subwavelength metallic slit is related to the number of groove and the incident
wavelength. Furthermore, the above resonances also exist in the structure whose lengths of metallic slits are set as the
length of a slit without groove at the surface plasmon high-order mode resonance. By optimizing the geometric
parameters, the transmission enhancement of the grooved subwavelength metallic slit as high as about 15367% is
achieved.
An all-optical diode (AOD) with structure (AB)m(BA)n(BBAA)k is proposed based on asymmetric light localization, and its optical bistability are numerically investigated by the nonlinear transfer matrix method. Research results show that the behavior of the AOD strongly depends on the period number m, n, and k, the transmission direction of the AOD is related to the values of m and n, while k affects the transmission contrast of the AOD. It is a significant reference for the design of all-optical signal processing devices.
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