Figure 5
From: Planar binary-phase lens for super-oscillatory optical hollow needles
The experimental microscope setup. The laser beam from a He-Ne Laser passes through linear polarizer P1, and is converted to an azimuthally polarized Laguerre-Gaussian wave by S-waveplate SWP. Then, the wave is converted to an optical hollow needle by the super-oscillatory binary-phase lens BPL. A microscope system composed of a Nikon CF plan 100 × objective lens with NA = 0.95, open-loop nano-positioner PZT, tube lens, and CMOS camera is used to obtain the intensity image of the optical field generated by the BPL. The linear polarizer P2 is used only to verify the polarization of the resulting optical hollow needle, and removed otherwise.
