8 October 2004 Linear and nonlinear optics of thin metal films with randomly distributed subwavelength holes
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Abstract
Randomly distributed small holes of various subwavelength sizes were fabricated in a thin gold film. We have studied the optical near-filed transmission of the film. In the wavelength spectrum from 350nm to 650nm, a number of strongly enhanced transmission peaks were observed. These transmission peaks can only been observed in the near field. We attribute the new phenomenon to the surface plasmon coupling inside the holes and between the surfaces on the two sides of the thin film. We have also observed that the thin film support two-dimensional wave guiding and the guided light has a red shift of 200nm. Finally, we have observed strong second-harmonic radiation from the thin films with a pulsed laser of wavelength 1064nm. Strong second-harmonic radiation was observed at the wavelength of 532nm with a halfwidth of 40nm.
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Mufei Xiao, Mufei Xiao, Nikifor Rakov, Nikifor Rakov, } "Linear and nonlinear optics of thin metal films with randomly distributed subwavelength holes", Proc. SPIE 5515, Nanoengineering: Fabrication, Properties, Optics, and Devices, (8 October 2004); doi: 10.1117/12.558625; https://doi.org/10.1117/12.558625
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