Abstract
We report an experimental study of generation of photo-induced voltage in nano-porous gold (NPG) thin film under the radiation of obliquely incident nanosecond laser light in visible regions. For s- polarized light, negative voltage is observed along the incident plane for positive incident angles, while for p- polarized light, positive voltage is observed for wavelength longer than 510 nm, while it turns to negative for shorter wavelengths. The transverse voltage for various polarized light is explained in terms of symmetry of configuration and that of microscopically random but macroscopically isotropic NPG.
Highlights
It is known that photo-induced voltage is generated in conducting thin film during the interaction of laser pulses and the simplest description for this observed voltage is that when structure is radiated by light, light can push electrons through Lorentz force due to its electric and magnetic fields
In this paper we report for the first time photo-induced voltage in Nano-Porous Gold (NPG) thin film, which is a random nanostructure
In this condition with circular polarized light, when electric field of the light rotates clockwise in the xy plane as is looked toward the propagation direction, we refer this polarization as Right Circular Polarization (RCP) and when it rotates anticlockwise, we define it as Left Circular Polarization (LCP)
Summary
It is known that photo-induced voltage is generated in conducting thin film during the interaction of laser pulses and the simplest description for this observed voltage is that when structure is radiated by light, light can push electrons through Lorentz force due to its electric and magnetic fields. The force on electrons can be detected as a voltage in the structure In simple cases, this force can be estimated using momentum conservation, that is, momentum from photons transfers to the free carriers of the material and this effect manifests itself as a pulsed voltage. This force can be estimated using momentum conservation, that is, momentum from photons transfers to the free carriers of the material and this effect manifests itself as a pulsed voltage This phenomenon has been investigated by other groups in various materials and explained in terms of optical rectification and photon drag effect. In systems without inversion symmetry, light can induce DC polarization in the structure that is second order in terms of electric field This term is referred to as optical rectification and is responsible for the voltage.
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