Optical fiber meta-tips

Principe, M.; Micco, A.; Crescitelli, A.; Castaldi, G.; Consales, M.; Esposito, E.; Ferrara, V. La; Galdi, Vincenzo; Cusano, A.

doi:10.1117/12.2227337

Cited by 16 publications

(45 citation statements)

References 6 publications

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“…The metadevice demonstrated here is an example of the broad range of opportunities arising from fibreintegration of metasurfaces that could also be used to control, for example, focusing, polarization, spectral characteristics, propagation direction and angular momentum of light [31][32][33].…”

Section: Discussionmentioning

confidence: 99%

Fibre-optic metadevice for all-optical signal modulation based on coherent absorption

et al. 2018

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Recently, coherent control of the optical response of thin films in standing waves has attracted considerable attention, ranging from applications in excitation-selective spectroscopy and nonlinear optics to all-optical image processing. Here, we show that integration of metamaterial and optical fibre technologies allows the use of coherently controlled absorption in a fully fiberized and packaged switching metadevice. With this metadevice, which controls light with light in a nanoscale plasmonic metamaterial film on an optical fibre tip, we provide proof-of-principle demonstrations of logical functions XOR, NOT and AND that are performed within a coherent fibre network at wavelengths between 1530 and 1565 nm. The metadevice has been tested at up to 40 gigabits per second and sub-milliwatt power levels. Since coherent absorption can operate at the single-photon level and with 100 THz bandwidth, we argue that the demonstrated all-optical switch concept has potential applications in coherent and quantum information networks.

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Section: Discussionmentioning

confidence: 99%

Fibre-optic metadevice for all-optical signal modulation based on coherent absorption

et al. 2018

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“…Future studies will be focused on optimizing procedures for controlling MGs deposition. Although in our experiments the EOT-like structure parameters have been chosen in order to maximize the sensitivity at the expenses of the resonance bandwidth, resonance Q factor and sensitivity can be significantly optimized through exploitation of advanced patterns and structures 6 , 45 , 46 .…”

Section: Discussionmentioning

confidence: 99%

Microgel assisted Lab-on-Fiber Optrode

Aliberti

Ricciardi

Giaquinto

et al. 2017

Sci Rep

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Precision medicine is continuously demanding for novel point of care systems, potentially exploitable also for in-vivo analysis. Biosensing probes based on Lab-On-Fiber Technology have been recently developed to meet these challenges. However, devices exploiting standard label-free approaches (based on ligand/target molecule interaction) suffer from low sensitivity in all cases where the detection of small molecules at low concentrations is needed. Here we report on a platform developed through the combination of Lab-On-Fiber probes with microgels, which are directly integrated onto the resonant plasmonic nanostructure realized on the fiber tip. In response to binding events, the microgel network concentrates the target molecule and amplifies the optical response, leading to remarkable sensitivity enhancement. Moreover, by acting on the microgel degrees of freedom such as concentration and operating temperature, it is possible to control the limit of detection, tune the working range as well as the response time of the probe. These unique characteristics pave the way for advanced label-free biosensing platforms, suitably reconfigurable depending on the specific application.In biochemical sensing field, Lab-on -Fiber (LOF) based devices essentially consist on the combination of optical resonant nanostructures (typically patterned metallic slab supporting surface plasmon resonances (SPR)) and functional coating materials integrated on the optical fiber tip [1][2][3][4][5][6][7] . LOF technology is continuously leading to the development of novel biosensing probes with unique properties in term of size, weight and ease of interrogation 4,5 . In addition to point of care applications, LOF based devices seem to be particularly promising for in-vivo analysis systems, thanks to the intrinsic properties of optical fibers that make them easily integrable inside medical catheters or needles 8 . Typically, the working principle of LOF probes relies on the affinity interaction of a ligand attached to the sensor surface with the target molecule present in a liquid solution at a certain concentration. However, standard label-free approaches fail when target molecules are small, for example about a few hundreds of dalton. In that case, the ligand/analyte binding process produces a biological layer that is not thick enough for providing a local refractive index (RI) change that is optically detectable by the sensor. Analogous issues occur in such applications where the detection of larger analytes with very low limit of detection (LOD) is required. To enhance the sensitivity, gold and magnetic nanoparticles have been proposed as "molecular concentrators" able to localize multiple binding events on a single particle, and successively deliver target analyte from the solution to the sensor surface [9][10][11] . At the same time, approaches exploiting hydrogels (HGs) have been proposed 12,13 . HGs basically allow to: i) increase the analyte loading capacity by translating a conventional 2D interaction surface into a 3D volume inter...

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“…[ 39 ] The remaining 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 λ r , the grazing condition is satisfied both in transmission and in reflection; this implies that at λ r , the (constant) phase gradient must be

γ \geq \max false{n_{normalt}, n_{normalr} false} \frac{2 π}{λ_{0}} = n_{normalr} 2 π / λ_{0}

. Furthermore, in order to improve the quality factor of the resonance,

λ_{normalr}

must be slightly larger than

λ_{SW}^{r}

; this implies the coupling of the antennas’ resonance to the lattice surface modes, whose effects have been widely studied in the topical literature.…”

Section: Idea and Geometrymentioning

confidence: 99%

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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Optical fiber meta-tips

Cited by 16 publications

References 6 publications

Fibre-optic metadevice for all-optical signal modulation based on coherent absorption

Fibre-optic metadevice for all-optical signal modulation based on coherent absorption

Microgel assisted Lab-on-Fiber Optrode

Metasurface‐Enhanced Lab‐on‐Fiber Biosensors

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