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a–c Polarization distribution of CVB with φo = 0°,45°,90°. d-f polarization distribution with corresponding field intensity
Source publication
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Based on vector diffraction theory and annular Walsh function filter, axially splitted ultra-long multiple optical needles/optical tubes of electric as well as magnetic field distributions are numerically generated by generalized cylindrical vector Bessel Gaussian beam phase modulated by annular Walsh function filter. This multiple optical structur...
Citations
... For focusing systems, diffractive optical elements (DOE) can be used to modify the phase [1-6], amplitude [6,7], and polarization [2,6,8,9] of the incident beam, thereby obtaining various targetfocused light fields. Xu et al. proposed a method for generating super-resolution focused beams with an ultrahigh aspect ratio, which can enhance super-resolution microscopic imaging [4]. ...
... For focusing systems, diffractive optical elements (DOE) can be used to modify the phase [1-6], amplitude [6,7], and polarization [2,6,8,9] of the incident beam, thereby obtaining various targetfocused light fields. Xu et al. proposed a method for generating super-resolution focused beams with an ultrahigh aspect ratio, which can enhance super-resolution microscopic imaging [4]. ...
... The experimental results demonstrate the accurate optical field shaping effect and the axial intensity adjustable ability of LC DOE, indicating potential applications in optical tomography and precision manufacturing, among others. © For focusing systems, diffractive optical elements (DOE) can be used to modify the phase [1][2][3][4][5][6], amplitude [6,7], and polarization [2,6,8,9] of the incident beam, thereby obtaining various targetfocused light fields. Xu et al. proposed a method for generating super-resolution focused beams with an ultrahigh aspect ratio, which can enhance super-resolution microscopic imaging [4]. ...
In this Letter, we report the application of planar liquid crystal (LC) devices in axial focus shaping, proving that LC diffractive optical elements (DOEs) can achieve continuous adjustment of a symmetrical axial light field by changing the ellipticity of the incident light and can flexibly and quickly achieve various axial light field designs through an axial iterative Fourier transform algorithm. The LC DOE achieves a quasi-continuous phase and an extremely high transmittance (98.6% at 1030 nm), which makes the focusing efficiency of the LC DOE with two segments of uniform focal depths as high as 84%. The experimental results demonstrate the accurate optical field shaping effect and the axial intensity adjustable ability of LC DOE, indicating potential applications in optical tomography and precision manufacturing, among others.
... Recently F. Machado et al experimentally demonstrate the multiple-plane image formation using Walsh zone plates [40].More recently we also numerically generates the axial multiple focal hole segments by tight focusing of phase modulated azimuthally polarized beam with help of annular Walsh function lter [41,42]. In this paper, axially splitted multi foci (AMF) are numerically demonstrated by tight focusing of HCVB phase modulated with annular Walsh function lter. ...
Axially splitted multi foci(AMF) are numerically generated by tight focusing of higher order cylindrical vector beam(HCVB) through an annular Walsh filter .Here we report that by properly manipulating the parameters of HCVB such as initial phase( φ 0 ),topological charge ( m ), polarization rotation angle or azimuthal index ( a ) and suitably phase modulated with a Walsh function filter of fixed orders ( n ) and annular obstruction (ε) ,onecan generate axially polarized multiple spots,transversely polarized multiple holes,transversely polarized multi spots,axially and transversely polarized multi holes with extended central annular region.These distributions may be useful for multiple optical trapping and axial superresolution microscopy.
