Journal
OPTICS EXPRESS
Volume 22, Issue 18, Pages 22163-22171Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.022163
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Funding
- China National Key Basic Research and Development Program [2013CBA01700]
- China National Science Foundation [61077057, 61177093]
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In this paper, we numerically demonstrate the advantage of utilizing continuous amplitude and phase modulation in super-oscillation focusing lens design. Numerical results show that compared with simple binary amplitude modulation, continuous amplitude and phase modulation can greatly improve the super-oscillation focusing performance by increasing the central lobe intensity and the ratio of its energy to the total energy, reducing the sidelobe intensity, and substantially extending the field of view. Our study also reveals the role of phase distribution in reducing the spatial frequency bandwidth of the super-oscillation optical field on the focal plane. Based on continuous amplitude and binary phase modulation, a lens was designed with double layer metal slit array for wavelength of 4.6 mu m. COMSOL is used to carry out the 2D simulation. The lens focal length is 40.18 lambda and the focal spot FWHM is 0.308 lambda. Two largest sidelobes are located right next to the central lobe with intensity about 40% of the central lobe intensity. Except for the two sidelobes, other sidelobes have intensity less than 25% of the central lobe intensity, which leads to a clear field of view on the whole focal plane. (C) 2014 Optical Society of America
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