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Metallic gratings with narrow slits can lead to special optical properties such as strongly enhancing the trans-mission and considerably strengthening the polarized effect.A narrow-band filter suitable for application in optical communication is designed by sandwiching a metallic grating between two identical dielectric films.The maximum transmission can reach 96% after optimizing the parameters of films and grating at a central wavelength of 1053 nm.It is the first time,to our knowledge,that such high transmission has been reported since the discovery of the extraor-dinarily high transmission through periodic holes or slits;moreover,the extremely polarized effect is also found in P mode of this symmetric grating.
Metallic gratings with narrow slits can lead to special optical properties such as strongly enhancing the trans-mission and substantially strengthening the polarized effect. A narrow-band filter suitable for application in optical communication is designed by sandwiching a metallic grating between two identical dielectric films. The maximum transmission can reach 96% after optimizing the parameters of films and gratings at a central wavelength of 1053 nm. It is the first time, to our knowledge, that such high transmission has been reported since the discovery of the extraor-dinarily high transmission through periodic holes or slits; moreover, the extremely polarized effect is also found in P mode of this symmetric grating.