Abstract
Conventional optics suffer from the diffraction limit. Our recent work has predicted a nanoslit-based two-dimensional (2D) lens with transverse-electric (TE) polarized design that is capable of realizing the super-resolution focusing of light beyond the diffraction limit in the quasi-far field. Furthermore, the super-resolution capability can be kept in a high-refractive-index dielectric over a wide wavelength range from ultraviolet to visible light. Here, we systematically investigate the influence of various factors on the super-resolution focusing performance of the lens. Factors such as lens aperture, focal length and nanoslit length are considered. In particular, the influence of nanoslit length on lens focusing was ignored in the previous reports about nanoslit-based 2D lenses, since nanoslit length was assumed to be infinite. The numerical results using the finite-difference time-domain (FDTD) method demonstrate that the super-resolution focusing capability of a nanoslit-based 2D lens increases with the lens aperture and reduces with the increase of the lens focal length. On the other hand, it is notable that the length of the lens focus is not equal to but smaller than that of the nanoslits. Therefore, in order to achieve a desired focus length, a lens should be designed with longer nanoslits.
Highlights
The spatial resolution of conventional optical devices is restricted by diffraction to nearly half the operating wavelength, which greatly limits the performance of all the imaging and focusing systems that lie at the heart of modern biology, electronics and optical integrated circuits [1,2,3]
We explore the effect of various factors on the super-resolution focusing properties of a TE-polarized nanoslit-based 2D lens for guiding practical application
The results illustrate that the nanoslit length determines the line focus length of a nanoslit-based 2D lens
Summary
The spatial resolution of conventional optical devices is restricted by diffraction to nearly half the operating wavelength, which greatly limits the performance of all the imaging and focusing systems that lie at the heart of modern biology, electronics and optical integrated circuits [1,2,3]. Without the excitation plasmonic-zone lens was proposed realize far-field super-resolution focusing [28].ofInSPPs, our we successfully designed a planar lens composed of metallic nanoslits under the illumination of a latest research, without the excitation of SPPs, we successfully designed a planar lens composed of TE-polarized plane wave (the polarization parallel to the nanoslit) with a capability of super-resolution metallic nanoslits under the illumination of a TE-polarized plane wave Further improve the method and provide a guide for practical applications
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