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2004
Journal Article
Titel
Diffraction-based solid immersion lens
Abstract
A solid immersion lens based on diffraction (dSIL) is proposed as an alternative to the conventional design based on refraction. A design analogous to a Fresnel zone plate is derived in accordance with the Huygens- Fresnel principle. Fabrication of a binary dSIL is achieved by electron-beam lithography and reactive-ion etching on LaSF35, with index n 5 2.014. Measurement of the point-spread function is performed with near- field optical microscopy. The results are in accord with the expected resolution enhancement of a factor n with respect to the diffraction limit.