Evaluation of fiber-optic phase-gradient meta-tips for sensing applications

Principe, M.; Consales, M.; Castaldi, G.; Galdi, Vincenzo; Cusano, A.

doi:10.1177/1847980419832724

Cited by 22 publications

(14 citation statements)

References 53 publications

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“…This MT configuration was applied for beam polarization and phase gradient control. 262 Similarly, Yang et al 263 reported an optical metalens patterned on the core area of a PCF endface to be used for light focusing at communications wavelengths, which showed a maximum enhanced optical intensity as large as 234% at the focal point of the lens. Moreover, Xomalis et al 264 reported a fully fiberized and packaged optical switching meta-fiber device based on coherently controlled absorption [Fig.…”

Section: D Functional Surfacesmentioning

confidence: 99%

Multifunctional integration on optical fiber tips: challenges and opportunities

Xiong

2020

Adv. Photon.

133

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The flat endface of an optical fiber tip is an emerging light-coupled microscopic platform that combines fiber optics with planar micro-and nanotechnologies. Since different materials and structures are integrated onto the endfaces, optical fiber tip devices have miniature sizes, diverse integrated functions, and low insertion losses, making them suitable for all-optical networks. In recent decades, the increasing demand for multifunctional optical fibers has created opportunities to develop various structures on fiber tips. Meanwhile, the unconventional shape of optical fibers presents challenges involving the adaptation of standard planar micro-and nanostructure preparation strategies for fiber tips. In this context, researchers are committed to exploring and optimizing fiber tip manufacturing techniques, thereby paving the way for future integrated all-fiber devices with multifunctional applications. First, we present a broad overview of current fabrication technologies, classified as "top-down," "bottom-up," and "material transfer" methods, for patterning optical fiber tips. Next, we review typical structures integrated on fiber tips and their known and potential applications, categorized with respect to functional structure configurations, including "optical functionalization" and "electrical integration." Finally, we discuss the prospects for future opportunities involving multifunctional integrated fiber tips.

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Section: D Functional Surfacesmentioning

confidence: 99%

Multifunctional integration on optical fiber tips: challenges and opportunities

Xiong

2020

Adv. Photon.

133

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“…Numerical simulations showed that for d ≥ 1000 nm, the reflectivity spectra are mainly affected by the resonance of the single antennas and much more mildly by the array structure. [40] Step 2: Having fixed L 1 and L 2 to the values found at step 1, we gradually decrease d, up to its minimum value that allows the MS resonance wavelength to be as close as possible to (but still greater than) r SW . Indeed, as d decreases, the resonance wavelength of the MS blueshifts, so that, at the optimal value of d, the resonance wavelength lies about in the middle of the range of interest.…”

Section: Design Proceduresmentioning

confidence: 99%

“…[39] The remain-ing parameters to be optimized are the antennas' side lengths, L 1 and L 2 , and the distance d between neighboring elements. Based on a preliminary numerical study, [40] these parameters are tuned so that, at the resonance wavelength r , the grazing condition is satisfied both in transmission and in reflection; this implies that at r , the (constant) phase gradient must be ≥ max{n t , n r } 2 0 = n r 2 ∕ 0 . Furthermore, in order to improve the quality factor of the resonance, r must be slightly larger than r SW ; this implies the coupling of the antennas' resonance to the lattice surface modes, whose effects have been widely studied in the topical literature.…”

Section: Design Proceduresmentioning

confidence: 99%

“…[47] The resonance is designed to be close to the excitation condition of such surface wave, which coincides with the first-order Rayleigh anomaly. [40] Note that the polarization of the incident field does not affect the phenomenon under study; we assumed a linearly polarized incident field for a simpler characterization of the fabricated samples. The metasurface exhibits the same behavior also for right/left circularly polarized light, [37] in which case parallel and orthogonal polarization components become same-sense and reverse-sense circularly polarized components.…”

Section: Probe Designmentioning

confidence: 99%

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Metasurface‐Enhanced Lab‐on‐Fiber Biosensors

Consales

Quero

Spaziani

et al. 2020

Laser & Photonics Reviews

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The integration of metasurfaces on the tip of optical fibers enables advanced wavefront manipulations in Lab‐on‐Fiber application scenarios, and brings about new degrees of freedom that can be exploited for optimizing the surface sensitivity to local variations of the refractive index. Here, a novel biosensing platform is reported based on the integration of a phase‐gradient plasmonic metasurface on the tip of an optical fiber, able to detect biomolecular interactions with very high sensitivity. Specifically, the capability of the proposed platform to detect very low concentrations of streptavidin in running buffer solutions, with a limit of detection of the order of a few ng mL−1, is demonstrated. In addition, its inherent integrability within medical catheters/needles renders it potentially very attractive for application scenarios of real‐time diagnosis via liquid biopsy at precise locations inside the human body.

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“…The principles of operation of the device, applications along with their extraordinary advantages, fabrication challenges, and prospects are being discussed in a detailed manner. In the aspect of fabrication of new and novel optical devices, metasurface and optical fiber integrated [124,125] for the development of novel "lab-on-fiber" structures are also illustrated in this paper, which possess enormous potentials for future applications. The review work is concluded with a summarization of the challenges and prospects of this research area.…”

Section: Introductionmentioning

confidence: 99%

A Review on Metasurface: From Principle to Smart Metadevices

et al. 2021

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Metamaterials are composed of periodic subwavelength metallic/dielectric structures that resonantly couple to the electric and magnetic fields of the incident electromagnetic waves, exhibiting unprecedented properties which are most typical within the context of the electromagnetic domain. However, the practical application of metamaterials is found challenging due to the high losses, strong dispersion associated with the resonant responses, and the difficulty in the fabrication of nanoscale 3D structures. The optical metasurface is termed as 2D metamaterials that inherent all of the properties of metamaterials and also provide a solution to the limitation of the conventional metamaterials. Over the past few years, metasurfaces; have been employed for the design and fabrication of optical elements and systems with abilities that surpass the performance of conventional diffractive optical elements. Metasurfaces can be fabricated using standard lithography and nanoimprinting methods, which is easier campared to the fabrication of the counterpart 3 days metamaterials. In this review article, the progress of the research on metasurfaces is illustrated. Concepts of anomalous reflection and refraction, applications of metasurfaces with the Pancharatanm-Berry Phase, and Huygens metasurface are discussed. The development of soft metasurface opens up a new dimension of application zone in conformal or wearable photonics. The progress of soft metasurface has also been discussed in this review. Meta-devices that are being developed with the principle of the shaping of wavefronts are elucidated in this review. Furthermore, it has been established that properties of novel optical metasurface can be modulated by the change in mechanical, electrical, or optical stimuli which leads to the development of dynamic metasurface. Research thrusts over the area of tunable metasurface has been reviewed in this article. Over the recent year, it has been found that optical fibers and metasurface are coagulated for the development of optical devices with the advantages of both domains. The metasurface with lab-on fiber-based devices is being discussed in this review paper. Finally, research trends, challenges, and future scope of the work are summarized in the conclusion part of the article.‬‬‬‬‬‬‬

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Evaluation of fiber-optic phase-gradient meta-tips for sensing applications

Cited by 22 publications

References 53 publications

Multifunctional integration on optical fiber tips: challenges and opportunities

Multifunctional integration on optical fiber tips: challenges and opportunities

Metasurface‐Enhanced Lab‐on‐Fiber Biosensors

A Review on Metasurface: From Principle to Smart Metadevices

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