Current Trends in Development of Optical Metrology

Angelsky, Oleg V.; Maksymyak, P. P.; Zenkova, C. Yu.; Hanson, Steen Grüner; Zheng, Jinhai

doi:10.3103/s1060992x20040025

Cited by 6 publications

(4 citation statements)

References 51 publications

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“…[4,13]. Specific features of the PSs make them valuable instruments of optical metrology [123][124][125]. Like the familiar scalar singularities (e.g., optical vortices), the PSs create conditions for specific energy flow distributions favorable for the particles' trapping, guiding and manipulation in nanoengineering techniques [13,106,126,127].…”

Section: Discussionmentioning

confidence: 99%

Polarization singularities: Topological and dynamical aspects

et al. 2023

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The review describes general principles and characteristics of inhomogeneously polarized paraxial optical fields and, especially, the polarization singularities (PSs). Main parameters of the optical vector waves are discussed, with the emphasis on the physical relevance and topological distinctiveness of the PSs. Special features of the stochastic vector fields are considered in the context of the PSs’ genericity and structural stability. A detailed attention is paid to interrelations between the PSs and the phase singularities of scalar fields formed by the orthogonal polarization projections of the total field, and their derivatives (complex Stokes fields, phase-difference fields, etc.). On this base, the practical approaches are discussed for the experimental PS identification and characterization. A particular examination of the internal energy flows associated with the PSs, and accompanying distributions of the optical momentum and angular momentum, reveals meaningful dynamical features of PSs and supplies additional physically transparent and informative means for their studies and characterization.

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Section: Discussionmentioning

confidence: 99%

Polarization singularities: Topological and dynamical aspects

et al. 2023

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“…The data presented testify that observations of the mechanical motions of particles trapped in complex structured fields can give valuable information on the field properties and, especially, on the distribution of internal energy flows [6,9,10,30]. On the other hand, micro-and nano-objects with various optical properties (refractive index, external shape, and internal structure) differently react on the ponderomotive factors of the light field.…”

Section: Them (Figuresmentioning

confidence: 58%

Structured Light Control and Diagnostics Using Optical Crystals

et al. 2021

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We describe experimental results exposing the possibilities of optical crystals, especially anisotropic and birefringent, for creation, control, and diagnostics of structured light fields with singular and extraordinary properties. The efficiency of birefringent media is demonstrated for purposeful generation of optical beams with phase singularities (optical vortices) and desirable patterns of internal energy flows, in both the mono- and polychromatic light. On the other hand, anisotropic micro-objects can be used as probing bodies for investigation of the peculiar features of internal energy flows and corresponding momentum and angular momentum distributions in structured light fields. In particular, the specific mechanical action of light fields, formed under the total-reflection conditions, has been detected that confirms the existence of “extraordinary” dynamical characteristics of evanescent light waves predicted theoretically: the “transverse” momentum and “vertical” spin and their dependence on the incident beam polarization. The results can be useful for the optical trapping and micromanipulation techniques, including the biomedical and pharmaceutical applications.

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“…obtain its three-dimensional landscape. This fundamental difference distinguishes the proposed approach from the existing techniques described earlier [10][11][12][13][14][15][16] where only the data on the rough surface inhomogeneity is available.…”

Section: Discussionmentioning

confidence: 91%

“…In optical methods, information about the surface roughness is contained in the optical beam, obtained via the scattering of the probe radiation by the probed surface [6]. Among the optical approaches, the most common are methods [7] using optical profilometers [8,9], interference techniques [10][11][12][13], methods based on the speckle-correlation [14,15] and the light scattering phenomena [16]. It is the optical methods that enable the permanent on-line monitoring of the surface state in the course of technological process.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence Record Diagnostics of 3D Rough-Surface Landscapes With Nano-Scale Inhomogeneities

et al. 2022

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The paper proposes a new approach that enables the structure analysis and reconstruction of a rough surface where the height of inhomogeneities (from the depression to the upper point) varies within the spread about 20 nm. For the surface diagnostics, carbon nanoparticles are used, which serve as sensitive probes of the local surface height. A single nanoparticle can be positioned at a desirable point of the studied surface with the help of an optical tweezer employing the He-Ne laser radiation. Then the particle is illuminated by the strongly focused exciting beam of 405 nm wavelength, with the waist plane precisely fixed at a certain distance from the surface base plane. The particle’s luminescence response (in the yellow-green spectral range) strongly depends on the distance between the exciting beam waist and the particle, thus indicating the local height of the surface. After scanning the surface area and the consecutive interpolation, the surface “vertical” landscape can be reconstructed with a high accuracy: the numerical simulation shows that the RMS surface roughness is restored with an accuracy of 6.9% while the landscape itself is reconstructed with the mean error 7.7%.

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Current Trends in Development of Optical Metrology

Cited by 6 publications

References 51 publications

Polarization singularities: Topological and dynamical aspects

Polarization singularities: Topological and dynamical aspects

Structured Light Control and Diagnostics Using Optical Crystals

Fluorescence Record Diagnostics of 3D Rough-Surface Landscapes With Nano-Scale Inhomogeneities

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