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|Title: ||Voltage-induced broad-spectrum reflectivity change with surface-plasmon waves|
|Authors: ||Wang, Yu|
Russell, Stephen D.
Shimabukuro, Randy L.
|Keywords: ||Surface - plasmon (SP)|
attenuated total internal reflection (ATR)
white light modulator
|Issue Date: ||15-Jan-2005 |
|Publisher: ||American Institute of Physics|
|Citation: ||Journal of Applied Physics 97, 023708 (2005), doi:10.1063/1.1830093|
|Abstract: ||Voltage-induced broad-spectrum reflectivity change with surface-plasmon waves is reported. When white light is incident at a metal/electro-optical material interface, surface-plasmon waves can be excited under phase match conditions. This surface-plasmon resonance depends on the dielectric constants of both the metal and the electro-optical material. Photons in the surface-plasmon resonance wavelength range are absorbed by the interface. Since metals have large imaginary parts of their dielectric constants, the surface-plasmon resonances are broad and may cover all visible wavelengths. Applying voltage to the electro-optical material to change its dielectric constant can result in a change in the reflectivity at the interface. Experimental results showed a reflectivity change from almost 0% to about 40% under an applied voltage using a liquid-crystal and nickel film structure, and the results had good agreement with theoretical calculations. The theoretical calculations also predicted a 90% reflectivity recovery by exciting surface-plasmon waves at a Rh-Al/electro-optical material interface. These results demonstrate that a high efficiency white light modulator can be built using surface-plasmon excitations.|
|Appears in Collections:||JPL TRS 1992+|
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