Abstract
To resolve the problem of missed evanescent waves in a beam focusing system,
a hyperlens-based beam focusing device is proposed in this letter. This device can
convert the evanescent waves into propagating waves, and then a super-resolution
spot is formed at the center of the hyperlens. The working principle of the device
is presented, and the way in which the material and structural parameters of the
hyperlens affect the resolution and transmission is analyzed in detail. A multibeam
focusing device is optimally designed, and the simulated results verify that a
nanoscale spot with a diameter of 15.6 nm (corresponding to λ<sub>0</sub>/24, where
λ<sub>0</sub> is the working wavelength in vacuum) is achieved, which is far less than
the diffraction limited resolution with a value of 625 nm (1.7λ<sub>0</sub>). The device
is expected to find numerous applications in optical data storage and
nano{photolithography, among others.
© 2012 Chinese Optics Letters
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