Optical Correlation Diagnostics of Surface Roughness

Angelsky, Oleg V.; Maksimyak, Peter P.

doi:10.1007/0-387-29989-0_2

Cited by 4 publications

(10 citation statements)

References 42 publications

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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%

“…The size of the focused beam is determined by the focusing conditions. We use the micro-objective with the input pupil and the focal distance, correspondingly, D 23.8 mm, f 14.6 mm; (12) the corresponding input beam width of the Gaussian envelope is accepted b i 0.5D/ 2 √ 8.4 mm. This means that the focused beam waist radius [33],…”

Section: E(r Z)mentioning

confidence: 99%

“…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%

“…It is the optical methods that enable the permanent on-line monitoring of the surface state in the course of technological process. Typically, the applicability of such methods is limited by the lateral resolution up to the Rayleigh diffraction limit [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we have proposed an optical method that makes it possible to test and evaluate the degree of surfaces' inhomogeneity of the order of tens of micrometers by using carbon nanoparticles [18][19][20]. The method is based on the property of laser radiation, scattered by a rough (structured) surface, to form a speckle pattern [12,13,21], and carbon nanoparticles are employed for the study of this pattern. The synthesized carbon nanoparticles [20], about 50-70 nm in size, with a significant absorption at the wavelength of 405 nm and moderate absorption at the wavelength of He-Ne laser radiation, are able to move within aqueous suspensions under the action of optical forces generated by the internal energy flows in the light field [21,22].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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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Section: Discussionmentioning

confidence: 91%

Section: E(r Z)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

et al. 2022

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Interference diagnostics of surfaces

Angelsky

Maksimyak

et al. 2007

Opt. Mem. Neural Networks

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Optical phase singularities: Physical nature, manifestations and applications

Angelsky

Bekshaev²,

Vasnetsov³

et al. 2022

Front. Phys.

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Over the past 30 years, physical optics has been enriched by the appearance of singular optics as a new branch approved in scientific classifiers. This review briefly outlines the main concepts of the singular optics, their role in physical research and applications, and prospects of further development. The wave singularities are considered as a sort of structured-light elements and analyzed based on the generic example of screw wavefront dislocation (optical vortex). Their specific topological and mechanical properties associated with the transverse energy circulation are discussed. Peculiar features of the non-linear optical phenomena with singular fields are exhibited, with the special attention to generation of multidimensional entangled quantum states of photons. Optical fields with multiple singularities, especially, the stochastic speckle fields, are discussed in the context of optical diagnostics of random scattering objects. The exact and approximate correspondences between characteristic parameters of the optical-field intensity and phase distributions are analyzed with the aim of recovering phase information from the intensity measurements (“phase problem” solution). Rational singularity-based approaches to informative measurements of the scattered-field distribution are discussed, as well as their employment for the objects’ diagnostics. In particular, the practical instruments are described for the high-precision rough-surface testing. Possible enhancements of the singular-optics ideas and concepts in a wider context, including the transformation optics, near-field optics (surface waves), partially-coherent fields, and wave fields of other physical nature, are briefly exposed.

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Optical Correlation Diagnostics of Surface Roughness

Cited by 4 publications

References 42 publications

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

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

Interference diagnostics of surfaces

Optical phase singularities: Physical nature, manifestations and applications

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