Title :
A Hyperlens-Embedded Solid Immersion Lens for Beam Focusing Beyond the Diffraction Limit
Author :
Zheng, Guoxing ; Zhang, Ruiying ; Li, Song ; He, Ping An ; Zhou, Hui ; Shi, Yan
Author_Institution :
Sch. of Electron. Inf., Wuhan Univ., Wuhan, China
Abstract :
A novel beam focusing device called hyperlens-embedded solid immersion lens (HESIL) is proposed in this letter. In the device, a hyperlens which supports propagating waves with very large wavenumbers is embedded into a super-hemispherical solid immersion lens and a super-resolution focusing spot can be formed at the bottom planar plane of the HESIL. The working principles and characteristics of the device are discussed in detail. Numerical simulations verify that a nano-scale spot with a diameter of 57.5 nm (1/6.5 of the vacuum wavelength λ0 ) is achieved (the numerical aperture of the objective is 0.45) and the system transmission exceeds 34%, which validates the effectiveness of our proposed device for beam focusing. The device is expected to find numerous applications in high-density near-field optical data storage, nano-photolithography, and so on.
Keywords :
lenses; light diffraction; nanophotonics; numerical analysis; optical focusing; beam focusing device; diffraction limit; high-density near-field optical data storage; hyperlens-embedded solid immersion lens; nano-photolithography; numerical simulations; propagating waves; size 57.5 nm; super-hemispherical solid immersion lens; super-resolution focusing spot; Diffraction; Focusing; Lenses; Materials; Optical diffraction; Optical imaging; Optical refraction; Lenses; optical beam focusing; optical propagation in nonhomogeneous media;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2158638
