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—In this paper, a robust image watermarking method in two-dimensional space/spatial-frequency distributions domain is proposed which is robust against geometric distortion. This watermarking is detected by a linear frequency change. The one-dimensional S transformation and radon transformation are used to detect the watermark. The chirp signals are used as(More)
A plasmonic lens with metallic chirped circular nanoslits corrugated on Au film supported on quartz substrate for the purpose of superfocusing was put forth and fabricated by means of focused ion beam direct milling technique. Topography of the lens was imaged using an atomic force microscope. After that a near-field scanning optical microscope was employed(More)
In this paper,we introduce a robust image watermarking method based on Hilbert-Huang Transform against geometric distortion. This watermarking is detected by a linear frequency change. The Hilbert-Huang transformation is used to detect the watermark. The chirp signals are used as watermarks and this type of signals is resistant to all stationary filtering(More)
In this paper, a robust image watermarking method in two-dimensional space/spatial-frequency distributions domain is proposed which is robust against geometric distortion. This watermarking is detected by a linear frequency change. The Doppler let transformation is used to detect the watermark. The chirp signals are used as watermarks and this type of(More)
In this paper, a robust image watermarking method in two-dimensional space/spatial-frequency distributions domain is proposed which is robust against geometric distortion. This watermarking is detected by a linear frequency change. The chirp let transformation is used to detect the watermark. The chirp signals are used as watermarks and this type of signals(More)
A novel metallic elliptical nano-pinholes-based plasmonic lens was put forth for the purpose of superfocusing. Systematic investigation of the lens from design to fabrication and characterization were described in this paper. Surface plasmon polaritons (SPPs) enhanced transmission is theoretically analyzed using finite-difference time-domain (FDTD)(More)
Spectral shifts due to the excitation of higher-order modes occurred when an electric beam is directed near the silver nanowires. Three different theoretical approaches predict the main features of the observed spectra very well.
Reversed-phase liquid chromatography coupled with electrospray ionization mass spectrometry was used to study the molecular structures of components and molar mass distributions in ethyl silicate-40, a versatile liquid precursor for silicon-based materials. Identity testing by standard spectroscopic techniques showed that a commercial sample of ethyl(More)
Amorphous GaSb nanofibers were obtained by ion beam irradiation of bulk GaSb single-crystal wafers, resulting in fibers with diameters of ~20 nm. The Raman spectra and photoluminescence (PL) of the ion irradiation-induced nanofibers before and after annealing were studied. Results show that the Raman intensity of the GaSb LO phonon mode decreased after ion(More)
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