Near- to Far-Field Coupling of Evanescent Waves by Glass Microspheres

Boudoukha, Rayenne; Perrin, Stéphane; Demagh, Assia; Montgomery, P.C.; Demagh, Nacer-Eddine; Lecler, Sylvain

doi:10.3390/photonics8030073

Cited by 22 publications

(9 citation statements)

References 30 publications

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“…The results clearly show the conversion of an evanescent wave by the microsphere into a propagating wave in free space above the microsphere. 21 While this strengthens the idea that evanescent waves are involved in improving the lateral resolution, modeling results by other authors lead to the conclusion that it is mainly due to the increased numerical aperture of the microsphere. 22 ■ USE OF ENVIRONMENTAL CHAMBERS FOR…”

Section: Optical Propertiessupporting

confidence: 68%

Characterization of Functional Materials Using Coherence Scanning Interferometry and Environmental Chambers

et al. 2023

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Functional materials are challenging to characterize because of the presence of small structures and inhomogeneous materials. If interference microscopy was initially developed for use for the optical profilometry of homogeneous, static surfaces, it has since been considerably improved in its capacity to measure a greater variety of samples and parameters. This review presents our own contributions to extending the usefulness of interference microscopy. For example, 4D microscopy allows real-time topographic measurement of moving or changing surfaces. High-resolution tomography can be used to characterize transparent layers; local spectroscopy allows the measurement of local optical properties; and glass microspheres improve the lateral resolution of measurements. Environmental chambers have been particularly useful in three specific applications. The first one controls the pressure, temperature, and humidity for measuring the mechanical properties of ultrathin polymer films; the second controls automatically the deposition of microdroplets for measuring the drying properties of polymers; and the third one employs an immersion system for studying changes in colloidal layers immersed in water in the presence of pollutants. The results of each system and technique demonstrate that interference microscopy can be used for more fully characterizing the small structures and inhomogeneous materials typically found in functional materials.

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Section: Optical Propertiessupporting

confidence: 68%

Characterization of Functional Materials Using Coherence Scanning Interferometry and Environmental Chambers

et al. 2023

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“…Therefore, the fields inside the cylinder and the shape of the excited WGM strongly depends on the phase of the grating above it. The obtained result is an indicator for the conversion of evanescent waves to propagating waves by microspheres and -cylinders as discussed in more detail by Zhou et al 22 and Boudoukha et al 19 In comparison to the reflection mode, the effect of evanescent waves is expected to be enhanced in case of transmission since on the one hand the background field is expected to be significantly weakened and, on the other hand, further evanescent waves occur at the interface between glass and air. Nonetheless, also for reflection there seem to be slight contributions of the grating also for periods smaller than 180 nm.…”

Section: Resultsmentioning

confidence: 54%

“…Despite many investigations, the major reason for the obtained resolution enhancement is not clearly clarified yet. However, evanescent waves (EWs), 18,19 photonic nanojets (PNs), 5,20 whispering-gallery modes (WGMs) 21,22 and super-resonances 23 are effects frequently mentioned in the context of MAM. A detailed overview of optical phenomena occurring in microelements is provided by Minin and Minin.…”

Section: Introductionmentioning

confidence: 99%

Simulative investigation of microcylinder-assisted microscopy in reflection and transmission mode

Pahl,

Hagemeier,

Hüser

et al. 2023

Modeling Aspects in Optical Metrology IX

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Microsphere and microcylinder-assisted microscopy (MAM) has grown to an intensively studied optical farfield imaging technique over the last decade that overcomes the fundamental lateral resolution limit of a given microscope. However, the physical effects leading to resolution enhancement are still frequently debated. In addition, various configurations of MAMs operating in transmission as well as reflection mode are examined and results generalized. We present a rigorous simulation model of MAM and present a way to quantify the resolution simulatively. The lateral resolution is compared for microscope arrangements in reflection and transmission mode. Further, we discuss different physical effects with respect to their contribution to resolution enhancement. The results indicate that the effects affecting the resolution as well as the enhancement itself strongly depend on the arrangement of the microscope and the measurement object.

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“…Usually, the lateral resolution or beam waist of photonic jet focusing is a better than the simple diffraction limit (i.e. less than half of wavelength) [1,2,[7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Influence of the environment on the effect of super resonance in mesoscale dielectric spheres

Minin

Song

2023

Nanophotonics, Micro/Nano Optics, and Plasmonics VIII

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Dielectric mesoscale spheres have aroused strong interest because of their potential to localize light at deep subwavelength volume and to yield extremal internal magnetic and/or electric field enhancements. Recently, it was showed that such particle could support high-order Mie resonance modes with giant field localization and enhancement. Optimizing the internal fields appears as a key challenge for enhancing wave matter interactions in dielectric mesoscale particles. However, a dielectric particle is always located in some medium, and not in a vacuum. Moreover, the question is how much the environment medium affects the internal field intensities enhancement in the super-resonance effect. Based on Mie theory we show for the first time that the presence of the environment leads to a significant decrease in the intensity of the field in the particle. Thus, the study of the effect of super-resonance becomes meaningless without taking into account the environment. However, a greater enhancement of the internal field is found for the blue-shifted Mie size parameter of the sphere when the particle, for example, is in air rather than in vacuum.

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Near- to Far-Field Coupling of Evanescent Waves by Glass Microspheres

Cited by 22 publications

References 30 publications

Characterization of Functional Materials Using Coherence Scanning Interferometry and Environmental Chambers

Characterization of Functional Materials Using Coherence Scanning Interferometry and Environmental Chambers

Simulative investigation of microcylinder-assisted microscopy in reflection and transmission mode

Influence of the environment on the effect of super resonance in mesoscale dielectric spheres

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