Super-oscillation focusing lens based on
continuous amplitude and binary phase
modulation
Zhongquan Wen,
1
Yinghu He,
1
Yuyan Li,
1
Li Chen,
1
and Gang Chen
1,2,*
1
Key Laboratory of Optoelectronic Technology and Systems (Chongqing University), Ministry of Education, Key
Disciplines Lab of Novel Micro-nano Devices and System Technology, and School of Optoelectronics Engineering,
Chongqing University, Shapingba, Chongqing 400044, China
2
Department of Physics & Engineering Physics, Stevens Institute of Technology, Castle Point on Hudson, Hoboken,
New Jersey 07030, USA
*
GCHEN1@ cqu.edu.cn
Abstract: 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
µm. COMSOL is used to carry out the 2D simulation. The lens focal length
is 40.18λ and the focal spot FWHM is 0.308λ. 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.
©2014 Optical Society of America
OCIS codes: (220.3630) Lenses; (050.1965) Diffractive lenses; (050.6624) Subwavelength
structures; (230.3990) Micro-optical devices.
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Received 17 Jul 2014; revised 27 Aug 2014; accepted 27 Aug 2014; published 5 Sep 2014
8 September 2014 | Vol. 22, No. 18 | DOI:10.1364/OE.22.022163 | OPTICS EXPRESS 22163