Three-dimensional focus shaping with cylindrical vector beams

• Published in: Optics communications Vol. 265; no. 2; pp. 411 - 417
• Main Authors: Chen, Weibin, Zhan, Qiwen
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.09.2006; Elsevier Science
• Subjects: Cylindrical vector beams; Depth of focus; Exact sciences and technology; Flattop focusing; Focus shaping; Fundamental areas of phenomenology (including applications); Optical bubble; Optics; Physics; Polarization; Wave optics; Optical bubble; Cylindrical vector beams; Polarization; Focus shaping; Flattop focusing; Depth of focus; Numerical aperture; Optical polarization; Field distribution; Diffractive optics; Optical focusing; High field; Diffractive optical elements
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2006.04.066

A three-dimensional focus shaping technique using the combination of cylindrical polarization with binary diffractive optical element is proposed. The energy density pattern at the vicinity of the focus can be tailored in three dimensions by appropriately adjusting the parameters of the cylindrical vector beam illumination, numerical aperture of the objective lens and the design of the binary diffractive optical element. Focus with extended depth of focus that has both transversal and longitudinal flattop profile is obtained. Optical bubble that has a total dark volume surrounded by high field distributions is also shown. Potential applications of this focus shaping technique are discussed.