Experimental Research on Focusing Property of Radially Polarized Beam Based on Solid Immersion Lens |
| |
Authors: | Qing Li Jia Wang Jiying Xu Jiefeng Xi Guofan Jin |
| |
Institution: | (1) State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing, 100084, P. R. China |
| |
Abstract: | Realization of a near-field optical virtual probe based on an evanescent Bessel beam is strongly dependent on a radially polarized
beam; this makes it essential to study the focusing property of the beam. In this paper, two experimental setups based on
a fiber device and a liquid crystal device, respectively, are built to generate a radially polarized beam. This beam and an
annular radially polarized beam are focused by means of a high numerical aperture objective and a solid immersion lens (SIL).
Near-field distribution of the focus spot, the evanescent Bessel field, is experimentally measured with a scanning near-field
optical microscope (SNOM). The full width at half maximum (FWHM) of the central peak of the evanescent Bessel field is about
200 nm in the close vicinity of the bottom surface of SIL. This has potential for use as a near-field optical virtual probe. |
| |
Keywords: | near-field optics solid immersion lens (SIL) radially polarized beam evanescent Bessel beam virtual probe |
本文献已被 SpringerLink 等数据库收录! |
|