In this Letter, a phase-shifting angular shearing interferometer has been proposed for the application in optical surface metrology (SM) by using a combination of a wedge-shaped liquid crystal (LC) cell and a polarization phase shifter. The demonstration of this angular shearing interferometer for step height measurement is accomplished with the help of a phase-shifting technique. Four phase-shifted interferograms produced by a geometrical phase shifter are subjected to a simplified Wiener deconvolution method, which resembles a simple analysis technique for shearing interferograms in comparison to alternative approaches. A simulation study has been conducted to validate the proposed technique. The experimental results show an accuracy of 5.56 for determining the step height, which also agrees with the results obtained by atomic force microscopy. Owing to the tunability of birefringence, the proposed LC-based angular shearing interferometry technique will be useful to control spatial resolution in optical metrology.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OL.514441 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Approaching the refinement limit of nano laminated structures in cubic metals by severe plastic deformation.
Sci Rep
March 2025
School of Materials Science and Engineering, Nanjing University of Science & Technology, Nanjing, 210014, China.
Grain size refinement stagnates at the balance between refinement by dislocation accumulation and coarsening by thermal recovery for generally equiaxed structures upon increase of plastic strain. It is curious if this stagnation occurs also for laminated structures. In this paper, three kinds of metal with nanolamellar (NL) structure were successfully prepared by the method of equal channel angular processing (ECAP) followed by liquid nitrogen rolling (LNR).
View Article and Find Full Text PDFTurbulent Spectrum of 2D Internal Gravity Waves.
Phys Rev Lett
February 2025
Courant Institute of Mathematical Sciences, New York University, New York, New York 10012, USA.
We find the turbulent energy spectrum of weakly interacting 2D internal gravity waves using the full, nonhydrostatic dispersion relation. This spectrum is an exact solution of a regularized kinetic equation, from which the zero-frequency shear modes have been excised by a careful limiting process. This is a new method in wave kinetic theory.
View Article and Find Full Text PDFPacking of cohesive angular particles: Cohesive strength, structure, and effects of angularity.
Phys Rev E
January 2025
Université de Montpellier, LMGC, CNRS, Montpellier 34090, France.
Employing extensive 2D contact dynamics simulations, we analyze the effects of grain shape angularity on the quasistatic shear strength properties of cohesive granular packings. We consider sticky irregular polygons ranging from disklike shapes to triangle. We find that the Mohr-Coulomb cohesion (i.
View Article and Find Full Text PDFScattering insights into shear-induced scission of rod-like micelles.
J Colloid Interface Sci
May 2025
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, 37831, TN, United States. Electronic address:
Hypothesis: Understanding the scission of rod-like micelles under mechanical forces is crucial for optimizing their stability and behavior in industrial applications. This study investigates how micelle length, flexibility, and external forces interact, offering insights into the design of micellar systems in processes influenced by mechanical stress. Although significant, direct experimental observations of flow-induced micellar scission using scattering techniques remain scarce.
View Article and Find Full Text PDFMeasurement of Λ_{b}^{0}, Λ_{c}^{+}, and Λ Decay Parameters Using Λ_{b}^{0}→Λ_{c}^{+}h^{-} Decays.
Phys Rev Lett
December 2024
Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
A comprehensive study of the angular distributions in the bottom-baryon decays Λ_{b}^{0}→Λ_{c}^{+}h^{-}(h=π,K), followed by Λ_{c}^{+}→Λh^{+} with Λ→pπ^{-} or Λ_{c}^{+}→pK_{S}^{0} decays, is performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of 9 fb^{-1} collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. The decay parameters and the associated charge-parity (CP) asymmetries are measured, with no significant CP violation observed. For the first time, the Λ_{b}^{0}→Λ_{c}^{+}h^{-} decay parameters are measured.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!