Geometric effect on photonic nanojet generated by dielectric microcylinders with non-cylindrical cross-sections

Liu, Chengyang; Lin, Fan Chih

doi:10.1016/j.optcom.2016.06.021

Cited by 39 publications

(12 citation statements)

References 44 publications

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“…This type of focusing occurs when a plane wave is incident on a microscopic dielectric object of comparable size to λ vacc (for example, microspheres of radius ≈ 1–30 λ vacc [ 80 , 81 , 82 , 83 ]). PJ has been extensively studied during the last decade, both numerically and experimentally, for a wide range of dielectric microparticles of symmetric and asymmetric geometries, especially microspheres and microcylinders [ 80 , 82 , 84 ]. The mechanism of PJ focusing can be explained via the Mie scattering theory [ 82 ] as well as near-field diffraction approximations [ 79 ].…”

Section: Resultsmentioning

confidence: 99%

Numerical Analysis of the Light Modulation by the Frustule of Gomphonema parvulum: The Role of Integrated Optical Components

et al. 2022

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Siliceous diatom frustules present a huge variety of shapes and nanometric pore patterns. A better understanding of the light modulation by these frustules is required to determine whether or not they might have photobiological roles besides their possible utilization as building blocks in photonic applications. In this study, we propose a novel approach for analyzing the near-field light modulation by small pennate diatom frustules, utilizing the frustule of Gomphonema parvulum as a model. Numerical analysis was carried out for the wave propagation across selected 2D cross-sections in a statistically representative 3D model for the valve based on the finite element frequency domain method. The influences of light wavelength (vacuum wavelengths from 300 to 800 nm) and refractive index changes, as well as structural parameters, on the light modulation were investigated and compared to theoretical predictions when possible. The results showed complex interference patterns resulting from the overlay of different optical phenomena, which can be explained by the presence of a few integrated optical components in the valve. Moreover, studies on the complete frustule in an aqueous medium allow the discussion of its possible photobiological relevance. Furthermore, our results may enable the simple screening of unstudied pennate frustules for photonic applications.

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Section: Resultsmentioning

confidence: 99%

Numerical Analysis of the Light Modulation by the Frustule of Gomphonema parvulum: The Role of Integrated Optical Components

et al. 2022

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“…Photonics 2021, 8, x FOR PEER REVIEW 3 of 12 min, the solidified PDMS cube was obtained from the hole-type pattern. Some details of the technological process may be found in References [21,37]. A scanning optical microscope system was used to measure the focusing performances of the DMC with and without metal masks.…”

Section: Methods and Resultsmentioning

confidence: 99%

“…These PJ beam shaping methods have a lot in common. The field intensity distributions of the PJ shape depend significantly on the optical properties and size of the generating particle materials as well as the shape and polarization state of illuminating waves [21]. Additionally, the modulation of PJ properties by dielectric spherical and cuboid particles surrounded with ideally conducting thin masks has been theoretically investigated [22].…”

Section: Introductionmentioning

confidence: 99%

Multispectral Photonic Jet Shaping and Steering by Control of Tangential Electric Field Component on Cuboid Particle

Liu¹,

Chen²,

Minin

2021

Photonics

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In this study, we present the simulations and experimental observations of photonic jet (PJ) shaping by control of tangential electric field components at illuminating wavelengths of 405 nm, 532 nm, and 671 nm. The PJs are generated by a single dielectric 4-micrometer cube that was fabricated from polydimethylsiloxane (PDMS). The dielectric cube is deposited on a silicon substrate and placed on two aluminum masks with a width equal to the side length of the cube. Due to the appearance of the metal masks, the focal length and decay length of the generated PJs decreased almost twice, while the PJ resolution increased 1.2 times. Thus, PJ shaping can be controlled by the presence of the metal mask along the lateral surface of the cube without changing the external shape or internal structure of the cube. This effect is based on the control of the tangential components of the electric field along the lateral surface of the cube. In the case of a one-sided metal mask, the effect of optical deflection and bending is predicted to form a photonic hook. Due to the low cost of these dielectric cubes, they have potential in far-field systems to better meet the requirements of modern optical integration circuits and switches.

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“…One limitation of this approach is that the particles must have a large size (around five wavelengths) in order to achieve subwavelength resolution. In addition to spheres and cylinders, alternative geometries to produce PNJs have been suggested such as core-shell dielectrics 26,27 , hemispherical and elliptical particles 28,29 , dielectric cuboids [30][31][32] and graded index structures 33 . They have been proposed and demonstrated in different areas such as waveguiding [34][35][36] , directional emission 37 , surface plasmons 38,39 , optical trapping 40,41 backscattering 16,21,42,43 , Raman signal enhancement 44,45 and also working in reflection mode 44,46 , demonstrating to be good candidates to overcome the diffraction limit in different fields and spectral ranges.…”

Section: Introductionmentioning

confidence: 99%

Photonic nanojets with mesoscale high-index dielectric particles

Pacheco‐Peña

Beruete

2019

Journal of Applied Physics

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In this work, we demonstrate the ability of high-index dielectric particles immersed in air to generate photonic nanojets with extreme resolution (~0.06λ0).Both 2D (cylindrical) and 3D (spherical) particles are analyzed and their profile is truncated using the Weierstrass formulation for solid immersion lenses to produce a photonic nanojet at the output surface under planewave illumination. Their focusing capability is evaluated in terms of the spatial resolution achieving subwavelength values of ~0.14λ0 and ~0.06λ0, for a truncated cylinder and sphere respectively. The capability of the truncated sphere to enhance the backscattering produced by two small metallic spherical scatterers placed near the photonic nanojet is evaluated by using a scanning-probe microscopy configuration. The imaging capabilities of this technique are also analyzed by moving the metallic spheres in the transversal plane where the photonic nanojet is produced. The results here presented improve greatly the typical resolution of photonic nanojets generated with dielectric particles with small index contrast. In addition, the highindex material allows using mesoscale particles, leading to a more compact setup.These results may find applications in areas such as microscopy, imaging and sensing devices where a subwavelength resolution below the diffraction limit is needed.

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Geometric effect on photonic nanojet generated by dielectric microcylinders with non-cylindrical cross-sections

Cited by 39 publications

References 44 publications

Numerical Analysis of the Light Modulation by the Frustule of Gomphonema parvulum: The Role of Integrated Optical Components

Numerical Analysis of the Light Modulation by the Frustule of Gomphonema parvulum: The Role of Integrated Optical Components

Multispectral Photonic Jet Shaping and Steering by Control of Tangential Electric Field Component on Cuboid Particle

Photonic nanojets with mesoscale high-index dielectric particles

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