Quantum digital spiral imaging

Chen, Lixiang; Lei, Jijin; Romero, Jacquiline

doi:10.1038/lsa.2014.34

Cited by 182 publications

(90 citation statements)

References 40 publications

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“…A particular kind of vortices with fractional topological charge (or order) has received increasing attention due to their special features and potential use in applications ranging from optical manipulation [15,16], quantum entanglement [17], digital spiral imaging [18] among other topics. Typically, such types of vortices [15,16] exhibit a diffractive slit opening while they propagate so the beam's cross-section becomes asymmetric.…”

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confidence: 99%

Negative optical spin torque wrench of a non-diffracting non-paraxial fractional Bessel vortex beam

Mitri

2016

Journal of Quantitative Spectroscopy and Radiative Transfer

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-An absorptive Rayleigh dielectric sphere in a non-diffracting non-paraxial fractional Bessel vortex beam experiences a spin torque. The axial and transverse radiation spin torque components are evaluated in the dipole approximation using the radiative correction of the electric field. Particular emphasis is given on the polarization as well as changing the topological charge  and the beam's half-cone angle. When  is zero, the axial spin torque component vanishes. However, when  becomes a real positive number, the vortex beam induces left-handed (negative) axial spin torque as the sphere shifts off-axially from the center of the beam. The results show that a non-diffracting non-paraxial fractional Bessel vortex beam is capable to induce a spin reversal of an absorptive Rayleigh sphere placed arbitrarily in its path. Potential applications are yet to be explored in particle manipulation, rotation in optical tweezers, optical tractor beams, the design of optically-engineered metamaterials to name a few areas. Keywords: Negative spin torque, dielectric sphere, dipole approximation.The optical radiation torque [1] which arises from the transfer of angular momentum of light to a (lossy) dielectric sphere has received significant attention in optical levitation [2-4] and particle rotation applications in atomic physics [5,6], cell biology [7] and other areas [8,9]. In common optical laser beams, and under some conditions related to the particle absorptive properties, a spin torque causing the particle to rotate around its center of mass arises, in addition to an orbital component causing the particle to rotate around the beam's axis of wave propagation [1]. Note that the orbital torque component exerted on the sphere vanishes at the center of the beam. Moreover, the sphere should be absorptive in order to experience a spin torque [1]. Various standard types of laser beams have been suggested and investigated for this purpose [10,11]. Examples of beams also include optical vortices of Gaussian-like [12,13] and nondiffracting beams [14].A particular kind of vortices with fractional topological charge (or order) has received increasing attention due to their special In contrast, another class for factional vortex beams (which can be realized experimentally using blazed-phase hologram encoded in a programmable liquid crystal display illuminated with a He-Ne laser [19]) and displays limited-diffracting features during propagation exists [19,20]. The physically-realizable apodized beam carrying finite energy preserves the nondiffracting propagation property. It is also known as a high-order Bessel vortex beam of fractional type  (HOBVB-F) [21][22][23]. A HOBVB-F with fractional order  connects standard nondiffracting Bessel (vortex) beams (Fig. 1) of successive integer order in a smooth transition. It also generates individual vortices in the (lateral) plane perpendicular to the axis of wave propagation corresponding to a cross-section of the incident nondiffracting beam [19]. This specific feature provides ...

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confidence: 99%

Negative optical spin torque wrench of a non-diffracting non-paraxial fractional Bessel vortex beam

Mitri

2016

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…(29) where   is the average value of matrix A, and similarly for parameter   and matrix B. When the correlation coefficient value is close to 1, results indicate that there is a positive linear relationship between the two matrices [11].…”

Section: Results Of Focused Infrared Telescopementioning

confidence: 99%

Parameterized Modeling of Spatially Varying PSF for Lens Aberration and Defocus

Wang

Chen

Jia

et al. 2015

Journal of the Optical Society of Korea

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Image deblurring by a deconvolution method requires accurate knowledge of the blur kernel. Existing point spread function (PSF) models in the literature corresponding to lens aberrations and defocus are either parameterized and spatially invariant or spatially varying but discretely defined. In this paper, a parameterized model is developed and presented for a PSF which is spatially varying due to lens aberrations and defocus in an imaging system. The model is established from the Seidel third-order aberration coefficient and the Hu moment. A skew normal Gauss model is selected for parameterized PSF geometry structure. The accuracy of the model is demonstrated with simulations and measurements for a defocused infrared camera and a single spherical lens digital camera. Compared with optical software Code V, the visual results of two optical systems validate our analysis and proposed method in size, shape and direction. Quantitative evaluation results reveal the excellent accuracy of the blur kernel model.

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“…Conventional approaches use bulky free space components, such as wave-plates and polarizing analyzers, diffraction gratings [119,120], spatial light modulator [121][122][123], and interference measurement [124][125][126][127]. Spin-dependent metasurfaces, on the contrary, show a strong capability to generate and detect the angular momentum of light [113,114,[128][129][130].…”

Section: Oam Generator and Detectormentioning

confidence: 99%

Spin-dependent optics with metasurfaces

et al. 2016

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Optical spin-Hall effect (OSHE) is a spindependent transportation phenomenon of light as an analogy to its counterpart in condensed matter physics. Although being predicted and observed for decades, this effect has recently attracted enormous interests due to the development of metamaterials and metasurfaces, which can provide us tailor-made control of the light-matter interaction and spin-orbit interaction. In parallel to the developments of OSHE, metasurface gives us opportunities to manipulate OSHE in achieving a stronger response, a higher efficiency, a higher resolution, or more degrees of freedom in controlling the wave front. Here, we give an overview of the OSHE based on metasurface-enabled geometric phases in different kinds of configurational spaces and their applications on spin-dependent beam steering, focusing, holograms, structured light generation, and detection. These developments mark the beginning of a new era of spin-enabled optics for future optical components.

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Quantum digital spiral imaging

Cited by 182 publications

References 40 publications

Negative optical spin torque wrench of a non-diffracting non-paraxial fractional Bessel vortex beam

Negative optical spin torque wrench of a non-diffracting non-paraxial fractional Bessel vortex beam

Parameterized Modeling of Spatially Varying PSF for Lens Aberration and Defocus

Spin-dependent optics with metasurfaces

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