Optical Transmission Through Multilayered Ultra-Thin Metal Gratings
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Optical transmission properties of multilayered ultra-thin metal gratings are numerically studied. The transmission spectrum has a broad stop-band with extremely low transmittance compared to that of a single-layer one for TM polarization. The stop-band is shown to be formed by multiple-interference tunneling and various plasmon resonance processes in ultra-thin-metal and dielectric multilayers. That is on the transmission background of non-apertured metal/dielectric multilayer structures that have low transmission in the long-wavelength range due to destructive multiple-interference tunneling, the transmission is further suppressed in the stop-band by plasmon resonances in the top metal/dielectric layers, e.g., the anti-symmetric bound surface plasmon mode in the ultra-thin metal layer and the gap surface plasmon mode in the metal-sandwiched dielectric layer. High transmission beyond the stop-band is due to coupled gap surface plasmon mode in the entire multilayer structures. Applications of the optical properties of the multilayered ultra-thin metal gratings are suggested for optical filtering (wavelength or polarization selective).
KeywordsSurface plasmons Grating Ultra-thin metal Optical transmission
The authors acknowledge the financial support from the Natural Science Foundation of Fujian Province of China (No. 2011J06002) and the program for NCET in China (No. 08-0469).
- 23.Yeh P (2005) Optical waves in layered media. Wiley, New JerseyGoogle Scholar