Electrical and optical properties of planar tunnel device with Au nano-particles

In order to investigate relation of localized surface plasmon resonance and electron tunneling, we fabricated a planar type tunnel device that included Au nano-particles between two electrodes. It is expected that laser illumination to the Au nano-particles causes the plasma vibration that influences electronic tunneling. Aim of this study is to clarify relation between the localized surface plasmon resonance and electron tunneling in the fabricated tunnel device. This plasmonic device may be applied to an optical sensor with wavelength-selectivity.

Fig. 1 SEM image of the fabricated planar type tunnel device with Au nano-particles.

Fig. 2 Change of tunnel current by chopping laser light. Wavelength: 532 nm, temperature: 298 K, applied voltage: 4.5 V, chopping frequency: 30 Hz.

Fig. 3 Change of tunnel current by directions of linear polarized light. Applied voltage: 6.3 V, temperature: 85 K.