In this work is presented the visible light optical polarization effect on surface plasmon resonance (SPR) response of ON-OFF type in both ordered and in contact gold nanoparticles, created within a micro/nanostructured round pattern by direct laser writing and single micrometric size gold particle, respectively, in a dielectric matrix. The large difference between the refractive index of gold and dielectric material allowed to record the polarization induced SPR response of ON-OFF type in gold micro/nanoparticles by optical microscopy imaging in bright field, but only for the large size particles that provided images both in reflection and transmission modes. The plasmonic coupling effect could be clearer visualized by enhancing the quality of the recorded optical images using a dedicated imaging processing algorithm, which applied a package of proper filters to remove the noise and the blur, but also to enhance the contrast of the original images.
An image processing algorithm that improves the quality of Optical Coherence Tomographic (OCT) image by reducing its noise is presented. The algorithm consists of: bilateral, anisotropic, Gaussian unsharping mask filters and contrast stretch. A Michelson interferometer is used in the process of raw OCT images acquiring. The OCT configuration is driven by a swept optical source Superlum BS-840. Acquired raw OCT images are employed as input data to test the image process algorithm. Demonstrative images showing a comparison between raw OCT images and reconstructed images are presented.
This work presents the optical properties of periodically arranged gold nanostructured patterns drawn by direct laser writing in transparent polymer film and their effect on the color image. Optical properties of the patterned film combine the spectral response of its components revealing a “cut-off” filter behavior in 306-330 nm range and a considerable attenuation of transmission in the “green” region of the visible spectrum. A hyperspectral image processing algorithm depicts the colorchecker transformation accordingly to the filtering properties of the reflected components from the visible light spectrum of the patterned film. Demonstrative images are illustrated.
A chemical system consisting of a metallic salt, a water-soluble polymeric matrix and a photosensitive specie absorbing
at two-photon, has been used to produce metal deposition upon exposure to a femtosecond laser. We show that this
technique can be used to fabricate 2D and 3D metallic structures with gold and silver. We illustrate the potential use of
this technique for the fabrication of optical diffractive structures and we report on the first observations of spectral
filtering effects in the near vicinity of micro/nano structures.
We are using the technique of two-photon induced photoprecipitation to fabricate gold and silver nanostructures. Gold and silver nanoparticles are produced in solution as well as in thin films. In both cases an absorption peak associated with the plasmon resonance is clearly observed and is found to vary as particles grow. In addition, we show that this technique also permits the fabrication of 2D and 3D metallic nanostructures with a good quality. The potential for optical applications is discussed and illustrated on some examples. In particular, we observe high efficiency luminescence and strong tunable diffusion.
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