PFA sheets were modified with remote hydrogen plasma, and effects of the modification on
the adhesion between copper layer and FEP were investigated. Remote hydrogen plasma treatment for
a short time of 30 s is able to make the PFA surface hydrophilic. The remote hydrogen plasma treatment
causes defluorination and oxidation of PFA surface. The extent of the defluorination is 42−48%, and the
oxidation reaches 9−13% of the total carbon atoms. The modification of the PFA surface by the remote
hydrogen plasma is effective in the adhesion to copper metal. The peel strength for the copper metal/PFA system is improved from 0 to 101 mN/5 mm by the surface modification. The failure mode of the
copper metal/PFA system is an inner layer of the plasma-treated PFA layer. The remote hydrogen plasma
treatment is the preferable pretreatment of the PFA surface for adhesion with copper metal.
Metasurfaces of gold (Au) nanoparticles on a SiO2-Si substrate were fabricated for the enhancement of second harmonic generation (SHG) using electron beam lithography and lift-off. Triangular Au nanoprisms which are non-centro-symmetric and support second-order nonlinearity were examined for SHG. The thickness of the SiO2 spacer is shown to be an effective parameter to tune for maximising SHG. Electrical field enhancement at the fundamental wavelength was shown to define the SHG intensity. Numerical modeling of light enhancement was verified by experimental measurements of SHG and reflectivity spectra at the normal incidence. At the plasmonic resonance, SHG is enhanced up to ∼3.5 × 103 times for the optimised conditions.
We present an augmentation of Surface Plasmon (SP)-enhanced second harmonic generation (SHG) due to interference field enhancement in Au nanoprisms (AuNPs) on SiO2-coated Si substrates. The SiO2 spacer contributed for the optical interference and increased the coupling efficiency of the pump light with the SP polarization as well as a decoupling efficiency of the SHG waves from nonlinear polarization. The intensity of the SP-enhanced SHG signals increased 4.5-fold with respect to the AuNPs on the bare SiO2 substrate by setting the SiO2 spacer layer to the appropriate thickness. The numerical analysis revealed that the optimal SHG conversion was determined by the balance between the degree of the optical interference at the fundamental and SHG wavelengths.
We have developed an advanced vector quantization (VQ) encoding hardware for still image encoding systems. By utilizing needless calculation elimination method, computational cost of VQ encoding is reduced to 40% or less, while maintaining the accuracy of full-search VQ. We have also developed a still image compression algorithm based on adaptive resolution VQ (AR-VQ), which realizes compression ratio over U200 while maintaining image quality. We have successfully implemented these two technologies into a still image encoding processor. The processor can compress still image of 1600 x 2400 pixels within one second, which is 60 times faster than software implementation on current PCs.
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