Creation of Super Long Transversely Polarized Optical Needle Using Azimuthally Polarized Multi Gaussian Beam

Abstract

The intensity distribution in the focal region of a high-NA lens for the incident azimuthally polarized multi Gaussian beam transmitted through a multi belt spiral phase hologram is studied on the basis of the vector diffraction theory. Here we report a new method used to generate a needle of transversely polarized light beam with sub diffraction beam size of 0.366𝜆 that propagates without divergence over a long distance of about 22𝜆 in free space. We also expect that such a light needle of transversely polarized beam may find its applications in utilizing optical materials or instruments responsive to the transversal field only.

Tight Focusing Properties of Circularly Polarized Annular Multi-Gaussian Beam through a Uniaxial Birefringent Crystal

“…Chen Jian-Nong, et al proposed annular multi-Gaussian beam mode for sharp focusing [41]. Followed by this, tight focusing properties of annular multigaussian beam are investigated in several works [42][43][44][45]. In this paper, we demonstrate the tight focusing properties of circularly polarized annular multi-Gaussian beam through Uniaxial Birefringent Crystal.…”

Near-field characteristics of highly non-paraxial subwavelength optical fields with hybrid states of polarization

“…( 1) should be cancelled. [17][18][19][20][21] Figure 1 shows the corresponding hybrid SoP distributions in the cross-section of the initial field with m = 1 and m = 2. The white arrows indicate the directions of the polarization.…”

“…In contrast to most of the past researches based on spatially homogeneous polarization states such as linear, elliptical, and circular polarization, vector optical fields deal with spatially variant states of polarization (SoP) in the field cross-section. Recently, vector optical fields have aroused much interest in the linear and nonlinear optical fields because of their unique and novel properties and their potential applications, such as the generation of a different vector beam, [10][11][12][13][14] paraxial and nonparaxial propagation, [15][16][17][18] focusing a radially polarized beam to minimize the spot size, [19][20][21][22][23] and the self-focusing dynamics of a vector beam. [24,25] More recently, the evanescent waves of radially and azimuthally polarized and higherorder vector optical fields with locally linear polarization have been demonstrated.…”

Three-dimensional modulations on the states of polarization of light fields

“…[21,22] Hence, in the past decade, exploring novel vector fields with remarkable propagating and focusing property was becoming an interesting topic of beam physics. [23][24][25][26] It is well known that light wave is a transverse wave, that is, in free space, its electric vector is perpendicular to the propagation direction. Accordingly, the modulations of SoP mostly devote to engineer light fields with spatially inhomogeneous SoP in the cross-section, including in free space and optical media.…”