Tight Focusing of Light Beams: Effect of Polarization, Phase, and Coherence

Chen, Ziyang; Hua, Limin; Pu, Jixiong

doi:10.1016/b978-0-44-459422-8.00004-7

Cited by 34 publications

(21 citation statements)

References 148 publications

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“…Although we excite with a highly linearly polarized beam (extinction ratio higher than 1 : 10 3 ), an ellipticity is created due to the high numerical aperture of the focusing lens. Indeed, the electric field of a linearly polarized beam, when focused by a high-NA objective, acquires non-zero components in the two directions perpendicular to the polarization of the incident field (i.e., at the focal plane the electric field vector sweeps an ellipse) 37,38 . Thus, the tight focus of a linearly polarized excitation beam, breaks the rotational symmetry of the σ + and σ − polarizations and introduces an ellipticity in the pump spot.…”

Section: Theoretical Modelmentioning

confidence: 99%

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Polariton spin whirls

et al. 2015

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We report on the observation of spin whirls in a radially expanding polariton condensate formed under non-resonant optical excitation. Real space imaging of polarization-and time-resolved photoluminescence reveal a spiralling polarization pattern in the plane of the microcavity. Simulations of the spatiotemporal dynamics of a spinor condensate reveal the crucial role of polariton interactions with a spinor exciton reservoir. Harnessing spin dependent interactions between the exciton reservoir and polariton condensates allows for the manipulation of spin currents and the realization of dynamic collective spin effects in solid state systems.

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Section: Theoretical Modelmentioning

confidence: 99%

“…For a review see Ref. 38 . In our experiments, the polarization at the pump spot has been measured by focusing a linearly polarized beam with a 0.4 NA objective (the same used in the experiment) on a glass.…”

Section: S3 Ellipticity Of the Excitation Spotmentioning

confidence: 99%

Polariton spin whirls

et al. 2015

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“…Applications of this scheme may include the detection of objects near bright sources (e. g., extrasolar planets, zodiacal dusts, missiles with attached plumes, or defects in laser optics), optical tomography, or measurement techniques based on light scattering [8]. Chen's group studied the transmission of tight focused vortex beams through turbid media, and their results show that the electric fields of vortex beams are found to be more penetration capacity through the turbid media than that of no-vortex beams, and large topological charge L of the vortex beams is, the higher is the penetration capacity through the turbid media [2]. Ou's group investigated scattering of the Laguerre-Gaussian beam by a homogeneous spheroid, and compared LG beams with different topological charges L. It turns out that the magnitude of the scattering intensity decreases as the topological charge increases indicating that the transmission intensity increases with the topological charge L [1].…”

Section: Discussionmentioning

confidence: 98%

“…Light beams carrying OAM have wide applications in trapping particles, imaging and medical diagnosis, micro-machines, and quantum information. [1][2][3][4][5]. Therefore, it is of great interest to reveal the influence of OAM states of the vortex beams on the propagation and penetration capabilities through the turbid media.…”

Section: Introductionmentioning

confidence: 99%

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Propagation and transmission of optical vortex beams through turbid scattering wall with orbital angular momentums

et al. 2015

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Light scattering and transmission of optical Laguerre Gaussian (LG) vortex beams with different orbital angular momentum (OAM) states in turbid scattering media were investigated in comparison with Gaussian (G) beam. The scattering media used in the experiments consist of various sizes and concentrations of latex beads in water solutions. The LG beams were generated using a spatial light modulator in reflection mode. The ballistic transmissions of LG and G beams were measured with different ratios of thickness of samples (z) to scattering mean free path (l s ) of the turbid media, z/l s . The results show that in the ballistic region where z/l s is small, the LG and G beams show no significant difference, while in the diffusive region where z/ls is large, LG beams show higher transmission than Gaussian beam. In the diffusive region, the LG beams with higher orbital angular momentum L values show higher transmission than the beams with lower L values. The transition points from ballistic to diffusive regions for different scattering media were studied and determined.

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Laser Superdiffraction Optical Needle Direct Writing Lithography Method for Single‐Exposure Fabrication of High‐Aspect‐Ratio Microstructures

Wang

Zhang²,

Tian

et al. 2022

Adv Materials Technologies

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In this paper, a laser superdiffraction optical needle direct writing lithography method for single‐exposure fabrication of high‐aspect‐ratio microstructures (HARMs) is proposed. The principles of 3/4 circular image focusing and lithography exposure are theoretically analyzed, and the experimental setup is built. Experiments show that the linear interval and focusing accuracy of this method can reach 60 and 0.1 µm, respectively. Compared with the circular image focusing method, this method can determine the direction of defocus through the opening direction of the 3/4 circular spot. In addition, an optical needle with a resolution of 0.308 µm, a depth of focus of 1.836 µm, and an aspect ratio of 5.9538 is achieved by tightly focusing a radially polarized beam modulated by an annular amplitude type modulator with an annular factor of 0.7. Using this optical needle as the direct writing head, the HARM with a line width of 0.22 µm, a depth of 1.76 µm, and an aspect ratio of 8 is obtained experimentally by adjusting the photolithographic process parameters in combination with the focus detection curve. This method has the advantages of high fabrication efficiency, super diffraction resolution and high‐aspect‐ratio, which provides a new research idea for the fabrication of HARMs.

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Tight Focusing of Light Beams: Effect of Polarization, Phase, and Coherence

Cited by 34 publications

References 148 publications

Polariton spin whirls

Polariton spin whirls

Propagation and transmission of optical vortex beams through turbid scattering wall with orbital angular momentums

Laser Superdiffraction Optical Needle Direct Writing Lithography Method for Single‐Exposure Fabrication of High‐Aspect‐Ratio Microstructures

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