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8 March 2001 Overcoming the cut-off effect in the propagation of LRSP in a GaAs-Au-GaAs system
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Proceedings Volume 4318, Smart Optical Inorganic Structures and Devices; (2001)
Event: Advanced Optical Materials and Devices, 2000, Vilnius, United States
The cut-off effect in slightly asymmetric systems prevent the wider practical usage of long range surface polaritons (LRSP) in the infrared region. Due to asymmetry caused by the presence of even a few nanometers wide air gap the LRSP mode disappear. We propose a solution of this problem by using an effective medium approach. The basic idea is to compensate for the air gap induced asymmetry by introducing an additional layer into the system. That allows us to shift the cut-off to values sufficiently for experimental observation of LRSP. FTIR spectra of end-fire coupled LRSPs in the GaAs/Au/GaAs multilayer system were measured in the (800-3000) cm-1 range. Various geometric and polarization sensitive effects of the infrared system capable of influencing the LRSP coupling is discussed. A pronounced increase in the p and s polarized light transmission ratio at long-wavelengths is explained as an increase in the propagation distance L of LRSPs. A fairly good fit between experimental and calculated curves was achieved at long wavelengths. The width of the air gap was used as a parameter in the calculations.
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Viktoras V. Vaicikauskas, Johannes Bremer, Ola D. Hunderi, and Romas Antanavicius "Overcoming the cut-off effect in the propagation of LRSP in a GaAs-Au-GaAs system", Proc. SPIE 4318, Smart Optical Inorganic Structures and Devices, (8 March 2001);


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