Effect of random grating pit displacements on the Talbot image

Goloborodko, Andrey A.

doi:10.1364/josab.452649

Cited by 10 publications

(4 citation statements)

References 39 publications

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“…This is essential for assessing the performance and optimization of plasmonic devices in various applications 46 – 57 . In this realm recently several invaluable practical were proposed 58 – 64 .…”

Section: Plasmonics Biosensors Based On the Talbot Effectmentioning

confidence: 99%

Observation of Plasmonics Talbot effect in graphene nanostructures

Farmani,

Omidniaee

2024

Sci Rep

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We report on the theoretical models of the plasmoincs Talbot effect in graphene nanostructure. The Talbot effect for the plasmonics applications in the IR range is theoretically studied and the respective Talbot effect for the novel advanced plasmonics structures are numerically investigated for the first time. It is shown that the metamaterial structures with periodic grating configuration represents a complex three-dimensional lattice of beamlet-like graphene plasmonics devices. The calculated results agree well with the experimental ones. The results obtained can be used to create and optimize the structures considering diffraction limit for a wide range of application areas. Effective focusing of plasmonic waves with exact focal spots and a subwavelength full width at half maximum can be obtained by using periodic graphene grating.

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Section: Plasmonics Biosensors Based On the Talbot Effectmentioning

confidence: 99%

Observation of Plasmonics Talbot effect in graphene nanostructures

Farmani,

Omidniaee

2024

Sci Rep

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“…One should also note, that grating image structure depends on the correlation length in the way of general intensity what is defined by correlation function multiplier e − x 2 2r 2 . The pit image position provides the numerical data for grating measurement accuracy in the image plane [25,9]:…”

Section: Theorymentioning

confidence: 99%

Aberration measurements by a Talbot wavefront sensor in the presence of intensity variations

Kotov¹,

Danko²,

Goloborodko³

2023

J. Opt. Soc. Am. B

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Paper deals with the theoretical investigations of measurement accuracy of optical aberrations by Talbot wavefront sensor in the presence of random amplitude variations. Theoretical prediction of intensity distribution for gratings of any type based on their spatial spectrum is obtained, and it is shown that grating is fully restored in Talbot plane even for the high fraction of random amplitude. The possibilities of self-imaging phenomenon is investigated based on the simulation results. Simulation results show that pit displacement error increases when the correlation length decreases or when grating spatial spectrum increases. It is found that for defocus aberration intensity variations decrease measured defocus value and increment of aberrations of same order (oblique and vertical astigmatisms).

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“…The self-imaging effect reveals a phenomenon that, when a periodic structure (e.g., optical grating) is irradiated by a plane wave, the intensity distribution of the optical field at certain distances behind the structure shows the same period [19]. Benefiting from a simple optical path and high compactness, either linear or angular measurement has been demonstrated in past years based on the self-imaging effect of optical gratings.…”

Section: Introductionmentioning

confidence: 99%

Combined Displacement and Angle Sensor with Ultra-High Compactness Based on Self-Imaging Effect of Optical Microgratings

Zhang,

Yang,

Niu

et al. 2024

Sensors

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In this paper, an ultracompact combined sensor for displacement and angle-synchronous measurement is proposed based on the self-imaging effect of optical microgratings. Using a two-grating structure, linear and angular displacement can be measured by detecting the change of phase and amplitude of the optical transmission, respectively, within one single structure in the meantime. The optically transmitted properties of the two-grating structure are investigated in both theory and simulation. Simulated results indicate that optical transmission changes in a sinusoidal relationship to the input linear displacement. Meanwhile, the amplitude of the curve decreases with an input pitch angle, indicating the ability for synchronous measurement within one single compact structure. The synchronous measurement of the linear displacement and the angle is also demonstrated experimentally. The results show a resolution down to 4 nm for linear displacement measurement and a maximum sensitivity of 0.26 mV/arcsec within a range of ±1° for angle measurement. Benefiting from a simple common-path structure without using optical components, including reflectors and polarizers, the sensor shows ultra-high compactness for multiple-degrees-of-freedom measuring, indicating the great potential for this sensor in fields such as integrated mechanical positioning and semiconductor fabrication.

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Effect of random grating pit displacements on the Talbot image

Cited by 10 publications

References 39 publications

Observation of Plasmonics Talbot effect in graphene nanostructures

Observation of Plasmonics Talbot effect in graphene nanostructures

Aberration measurements by a Talbot wavefront sensor in the presence of intensity variations

Combined Displacement and Angle Sensor with Ultra-High Compactness Based on Self-Imaging Effect of Optical Microgratings

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