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9 September 2011 Discrete complex amplitude filter for ultra long optical tube
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We proposed a discrete complex amplitude filter to create a focused hollow field with ultra long depth of focus. As for a high numerical aperture lens (NA=0.95), the focused field in the focal region can be engineered into a field like a long "tube" with flat wall through manipulating the distribution of the transmitted amplitude and phase at the pupil plane. This complex amplitude filter at the pupil plane can be discretized into multiple annular zones with different radius, transmittances and phase delays. A focused tube field with long depth of focus(~9λ) has been created as an example through separating and averaging of the projected pupil radiation pattern of magnetic dipole array in the focal region. Imperfections of the designed filter will influence the quality of the generated optical tube field and tolerance deviation of the radius, transmittance and phase delay in each zone is discussed. For the optical trapping, this created tube field can expand the manipulated distance and increase the trapped particles' numbers.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jiming Wang, Qingliang Liu, Youwen Liu, Weibin Chen, and Qiwen Zhan "Discrete complex amplitude filter for ultra long optical tube", Proc. SPIE 8097, Optical Trapping and Optical Micromanipulation VIII, 809722 (9 September 2011);


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