Optical vortex metrology for nanometric speckle displacement measurement

Wang, Wei; Yokozeki, Tomoaki; Ishijima, Reika; Wada, Atsushi; Miyamoto, Yoko; Takeda, Mitsuo; Hanson, Steen Grüner

doi:10.1364/opex.14.000120

Cited by 126 publications

(71 citation statements)

References 7 publications

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“…Optical singularities present a growing interest for applications, e.g. metrology for precise displacement measurement [2], or orbital angular momentum modulation for optical communications [3].…”

Section: Introductionmentioning

confidence: 99%

Polarized vortices in optical speckle field: observation of rare polarization singularities

Dupont¹,

Orlik²

2015

Opt. Express

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Abstract:Using a recent method able to characterize the polarimetry of a random field with high polarimetric and spatial accuracy even near places of destructive interference, we study polarized optical vortices at a scale below the transverse correlation width of a speckle field. We perform high accuracy polarimetric measurements of known singularities described with an half-integer topological index and we study rare integer index singularities which have, to our knowledge, never been observed in a speckle field.

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Section: Introductionmentioning

confidence: 99%

Polarized vortices in optical speckle field: observation of rare polarization singularities

Dupont¹,

Orlik²

2015

Opt. Express

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“…The first system (named SUPHIM-SUperresolution PHase Image Microscope) was proposed and tested by V. Tychynsky [1,2]. Although the solution proposed by Tychynsky was not successful [3], the phase singularities are still believed to constitute a potential solution for new imaging microscopic systems [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] (not all of which were focused on superresolution [7,8,13,14]). Presently, the most successful superresolution system using optical vortices is the STED microscope [9], where the vortex beam is used as a depletion beam.…”

Section: Introductionmentioning

confidence: 99%

Analytical Model of the Optical Vortex Scanning Microscope with a Simple Phase Object

2017

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An analytical model of an optical vortex microscope, in which a simple phase object was inserted into the illuminating beam, is presented. In this microscope, the focused vortex beam interacts with an object and transmits the corresponding information to the detection plane. It was shown that the beam at the detection plane can be separated analytically into two parts: a non-disturbed vortex part and an object beam part. The intensity of the non-disturbed part spreads out over the center; hence, the small disturbance introduced by the object can be detected at the image center. A first procedure for recovering information about the object from this set-up was proposed. The theory was verified experimentally.

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“…Light beams having optical vortices (OVs) or phase singularities [1][2][3][4] have been attracting much interest because of their wide range of applications, such as information encoding, 5 optical manipulation, 6,7 stimulated emission depletion microscopy, 8 optical metrology, 9,10 and so on. The phase structure of an OV has a helical waveform that varies continuously from 0 to 2nπ rad (where n is an integer called the topological charge), and the center of the phase structure is a singular point with zero amplitude and an undefined phase.…”

Section: Introductionmentioning

confidence: 99%

Eight-connected contour method for accurate position detection of optical vortices using Shack–Hartmann wavefront sensor

et al. 2015

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Abstract. We propose a simple method of realizing an accurate position detection of phase singularities in an optical vortex (OV) beam using a Shack-Hartmann wavefront sensor (SH-WFS). The method calculates circulations which are the discrete contour integrals of phase slope vectors measured by the SH-WFS and then determines the accurate positions of the singular points by calculating the centers-of-gravity with a fixed window size around the local peak of the circulation distribution. We use closed paths that connect the centers of eightconnected, instead of 2 × 2-neighboring lenslet apertures for calculating the circulations. Both the numerical analysis and proof-of-principle experiment were performed to confirm the measurement accuracy. In experiments, the positions of singular points in OV beams generated by a liquid-crystal-on-silicon spatial light modulator were measured. The root-mean-square error of the position measurement was approximately 0.09 in units of the lens size of the lenslet array used in the SH-WFS. We also estimated the topological charges of the singular points being detected based on the peak circulations, and the results agreed well with theoretical ones. The method achieves both rapid implementation and sublens-size spatial resolution detection and is suitable for applications that require real-time control of OV beams.

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Optical vortex metrology for nanometric speckle displacement measurement

Cited by 126 publications

References 7 publications

Polarized vortices in optical speckle field: observation of rare polarization singularities

Polarized vortices in optical speckle field: observation of rare polarization singularities

Analytical Model of the Optical Vortex Scanning Microscope with a Simple Phase Object

Eight-connected contour method for accurate position detection of optical vortices using Shack–Hartmann wavefront sensor

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