Photonic Jet-Shaped Optical Fiber Tips versus Lensed Fibers

Bouaziz, Djamila; Chabrol, Grégoire; Guessoum, Assia; Demagh, Nacer-Eddine; Lecler, Sylvain

doi:10.3390/photonics8090373

Cited by 10 publications

(6 citation statements)

References 42 publications

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“…In addition, the sensing point has been fixed laterally to the axis joining the two cylinders (in the direction of the y-axis in Figure 1a). Both the illumination and detection systems would be performed with either lensed optical fibers or shaped optical fibers providing sub-micron spot sizes for a futurist prototype of the proposal [38].…”

Section: Methodsmentioning

confidence: 99%

All-Optical Nanosensor for Displacement Detection in Mechanical Applications

et al. 2022

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In this paper, we propose the design of an optical system based on two parallel suspended silicon nanowires that support a range of optical resonances that efficiently confine and scatter light in the infrared range as the base of an all-optical displacement sensor. The effects of the variation of the distance between the nanowires are analyzed. The simulation models are designed by COMSOL Multiphysics software, which is based on the finite element method. The diameter of the nanocylinders (d = 140 nm) was previously optimized to achieve resonances at the operating wavelengths (λ = 1064 nm and 1310 nm). The results pointed out that a detectable change in their resonant behavior and optical interaction was achieved. The proposed design aims to use a simple light source using a commercial diode laser and simplify the readout systems with a high sensitivity of 1.1 × 106 V/m2 and 1.14 × 106 V/m2 at 1064 nm and 1310 nm, respectively. The results may provide an opportunity to investigate alternative designs of displacement sensors from an all-optical approach and explore their potential use.

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Section: Methodsmentioning

confidence: 99%

All-Optical Nanosensor for Displacement Detection in Mechanical Applications

et al. 2022

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“…The PNJ has many properties, which depend on the refractive index, the shape, the size of the microsphere, and the wavelength of the incident light [13]. In this study, the essential characteristics of the PNJ under consideration encompass the following parameters: full width at half maximum (FWHM), working distance (WD, defined as the distance from the tip end to the PNJ's maximum intensity), peak light intensity, and intensity decay length (IDL) [14,15]. Due to the FWHM being narrower than the diffraction limit, it can be precisely directed towards the measurement position of the MMS, thereby reducing Doppler scattering interference to a minimum.…”

Section: Theory Of Pnj and Fabry-perot Interferencementioning

confidence: 99%

Microsphere-Based Microsensor for Miniature Motors’ Vibration Measurement

Xu,

Jiang,

Ban

et al. 2023

Sensors

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We present a microsphere-based microsensor that can measure the vibrations of the miniature motor shaft (MMS) in a small space. The microsensor is composed of a stretched fiber and a microsphere with a diameter of 5 μm. When a light source is incident on the microsphere surface, the microsphere induces the phenomenon of photonic nanojet (PNJ), which causes light to pass through the front. The PNJ’s full width at half maximum is narrow, surpassing the diffraction limit, enables precise focusing on the MMS surface, and enhances the scattered or reflected light emitted from the MMS surface. With two of the proposed microsensors, the axial and radial vibration of the MMS are measured simultaneously. The performance of the microsensor has been calibrated with a standard vibration source, demonstrating measurement errors of less than 1.5%. The microsensor is expected to be used in a confined space for the vibration measurement of miniature motors in industry.

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“…Researchers initially used spatially separated coaxial lenses to collect the light scattered and emitted from objects then couple it into fiber for the optical sensor and imaging, which increased the volume and packaging difficulty of the optical fiber probe [7,8] . Microlens integrated on fiber tip by LOT technology is a preliminary exploration to solve these problems, which can also effectively reduce the difficulty of device packaging and eliminate the tedious alignment process [9][10][11][12][13] . However, the fabrication of these lenses is complicated with strict requirements for fiber materials [14] .…”

Section: Introductionmentioning

confidence: 99%

Polarization-insensitive broadband metalens integrated on photonic crystal fiber tip

Dai

Wang

Liu

et al. 2023

Nanophotonics, Micro/Nano Optics, and Plasmonics VIII

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Fiber-tip lens not only makes the optical system more flexible and compact, but also eliminates complex alignment process, which makes it widely used in the fields of spatial light-fiber coupling, laser direct writing and fiber optic imaging. Compared to traditional glass lens, metalens is easier to be processed and integrated on fiber tip because of its special planar structure and small footprint. Fiber-tip metalens with high efficiency achromatic focusing ability has great application potential in multimode endoscope and other optical fiber imaging systems, so we designed a metalens with Si nanopost array that can achieve broadband focusing in the wavelength range of 1.2μm -1.6μm. For realizing broadband achromatic focusing, it is the crucial to meet the focusing phase and phase dispersion requirements simultaneously. Then we built a library of unit pillars with three kinds of cross-sectional geometries to provide diverse focusing phase (φ) and phase dispersion (δφ) combinations and defined a phase-dispersion space composed of parameters. In order to find the optimal unit pillar at each cell, we regarded the minimum Euclid distance between the points from the library and the target point in the phase-dispersion space as the criterion. Photonic crystal fiber (PCF) is a suitable integration platform for metalens because of the large core diameter and good dispersion property, so the PCF guided mode and plane wave are selected to lunch into the metalens for comparison and verification in the present work. The simulation results demonstrated that the metalens had a good achromatic focusing performance in the target wavelength band and changed little at different polarization of the source, which showed a good polarization-insensitive property.

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Photonic Jet-Shaped Optical Fiber Tips versus Lensed Fibers

Cited by 10 publications

References 42 publications

All-Optical Nanosensor for Displacement Detection in Mechanical Applications

All-Optical Nanosensor for Displacement Detection in Mechanical Applications

Microsphere-Based Microsensor for Miniature Motors’ Vibration Measurement

Polarization-insensitive broadband metalens integrated on photonic crystal fiber tip

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