Temat: refractive index sensor

Skocz do pozycji: 1.

Tytuł:: Single air-mode resonance photonic crystal nanofiber cavity for ultra-high sensitivity refractive index sensing
Autorzy:: Zhang, Yanni
Yang, Jiaxi
Song, Meiqi
Zhang, Xuan
Yang, Daquan
Tematy:: photonic crystal nanocavity
air mode nanofiber
refractive index sensor
sensitivity; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/173916.pdf Link otwiera się w nowym oknie
Opis:: We propose a design of series-connected one-dimensional photonic crystal nanofiber cavity sensor (1-D PC-NCS) and one-dimensional photonic crystal nanofiber bandgap filter (1-D PC-NBF). The proposed structure can get a single air mode for refractive index sensing with its extinction ratio of 58.64 dB. It filters out the high order mode and reduces the interaction between signals. By 3D FDTD, the calculated sensitivity is 848.18 nm/RIU (RIU – refractive index unit). Compared with general silicon on-chip nanobeam cavity, the sensitivity is increased by eight times. The additional 1-D PC-NBF will not change the sensitivity and the position of the resonance wavelength. Therefore, the new design we propose addresses the issue of crosstalk, and can be applied to ultra-high sensitivity index-based gas sensing and biosensing without the need for complicated coupling systems.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Optical simulations and optimization of highly sensitive biosensor for cancer cell detection
Autorzy:: El Mouncharih, Abdelkarim
Takassa, Rabi
Farkad, Omar
Tchenka, Abdelaziz
Ibnouelghazi, El Alami
Abouelaoualim, Driss
Tematy:: refractive index sensor
sensitivity
cancer cell
photonic crystal
finite difference time domain
FDTD; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/27310106.pdf Link otwiera się w nowym oknie
Opis:: In this work, using the two-dimensional finite difference time domain method, we are theoretically studying the optical properties of a two-dimensional photonic crystal biosensor based on silicon rods arranged as a square structure in an air bottom with two waveguides and a nanocavity. For this purpose, six different cells are infiltrated into the point defect. These six cells are Jurkat, HeLa, PC-12, MDA-MB-231, MCF-7, and basal cells. As a result, we have successfully detected cancer and benign cases of these cells through resonance peaks in the transmission spectrum. We evaluated the sensitivity, quality factor, detection limit, and figure of merit at different values for sensing region radius for optimization purposes. We report that we observed the maximum sensitivity of 1350 nm/RIU at 0.15 μm for the basal cell. Finally, the proposed biosensor can be a miniaturized structure with extreme sensitivity in cancer cell detection models.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Nanoblocks embedded in L-shaped nanocavity of a plasmonic sensor for best sensor performance
Autorzy:: Butt, M. A.
Kazanskiy, N. L.
Tematy:: plasmonic sensor
refractive index sensor
metal-insulator-metal waveguide
L-shaped cavity
finite element method; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1835766.pdf Link otwiera się w nowym oknie
Opis:: In this work, we proposed a highly sensitive design of a plasmonic sensor which is formed by embedding a periodic array of nanoblocks in L-shaped cavity formed by the metal–insulator–metal waveguide. The nanoblocks are placed in the strong electric field confinement region to further enhance its strength by confining it to a small area. To validate the study, the spectral characteristics of the proposed sensor design is compared to the spectral characteristics of a standard design having the same geometric parameters excluding nanoblocks in the cavity. The study shows that the incorporation of 5 nanoblocks of length 25 nm in the cavity can provide best performance indicators in the form of sensitivity, figure of merit and Q-factor. The sensitivity, figure of merit and Q-factor of the proposed sensor design is 1065 nm/RIU, 251.17 and 343.4 which is significantly higher than the standard L-shape resonator design. The sensor design can be developed with a single fabrication step. Due to the ease of fabrication and the highly responsive nature of the design, it can be used in biomedical applications.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Nanoslotted microring resonator for high figure of merit refractive index sensing
Autorzy:: Yang, Daquan
Duan, Bing
Zhang, Xuan
Lu, Hui
Tematy:: nanoslot
microring resonator
refractive index sensor
figure of merit
integrated nanophotonics
3D-FDTD; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174324.pdf Link otwiera się w nowym oknie
Opis:: A nanoslotted microring resonator (NSMR) with enhanced light-matter interaction has been designed, which can be used for high sensitive refractive index sensing. The performance of the device is investigated theoretically based on a three-dimensional finite-difference time-domain (3D-FDTD) method. In order to achieve high figure of merit sensing, the nanoslot geometry is exploited to make the optical field strongly localized inside the low index region and overlap sufficiently with the analytes. By using the 3D-FDTD method, the proposed NSMR sensor device achieves a high Q-factor (Q > 10⁵) and sensitivity ~100 nm/RIU (RIU – refractive index unit). Moreover, the strong light confinement introduced by the nanoslot in NSMR results in the sensor figure of merit as high as 6.73 × 10³. Thus, the design we proposed is a promising platform for refractive index-based biochemical sensing and lab-on-a-chip applications.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Design of localized surface plasmon resonance-based refractive index sensor using optical fiber
Autorzy:: Yadav, Mukti
Kaler, R. S.
Tematy:: localized surface plasmon resonance
LSPR
multi-mode optical fibre
refractive index sensor
sensitivity
COMSOL Multiphysics; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/58970213.pdf Link otwiera się w nowym oknie
Opis:: The paper proposes a design of a localized surface plasmon resonance-based refractive index sensor for the detection of a chemical compound availing unclad geometry of the optical fiber. The geometry is explored to analyze the sensing behavior and coupling phenomenon at the metal-dielectric interface. The finite element method (FEM) is applied numerically to evaluate the analytical change in the reflectance spectra of the fiber model by inoculating potassium nitrate compound. The resonance shift and reflectance of the surface plasmon resonance (SPR) signal obtained after the optimization of structural parameters enhance the sensing performance of the prototype. The sensor exhibits a maximum sensitivity of 80.2919 rad/RIU for a 1.56 high refractive index analyte and minimum sensitivity of 2.3446 rad/RIU for a 1.33 low refractive index analyte. The proposed sensor is modelled in such a way that it can be employed in various sensing applications for a wide range of refractive indices.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Ultraczuły fazowy sensor plazmonowy
Ultrasensitive plasmonic phase sensor
Autorzy:: Frydrychowicz, Adrianna
Opis:: Na potrzeby niniejszej pracy magisterskiej stworzono fazowy sensor plazmonowy, który umożliwia ultraczułą detekcję zmian współczynnika załamania światła. Kluczową kwestią było uzyskanie rezonansu plazmonowego, który w przedstawianej pracy wytworzono w oparciu o układ Kretschmanna oraz siatkę odbiciową, pozyskaną z odpowiednio zmodyfikowanej płyty DVD-R.Celem pozyskania dokładniejszych pomiarów, badana zmiana współczynnika załamania światła przebiegała w komorze próżniowej, umożliwiającej kontrolowany dopływ gazów o znanych współczynnikach załamania światła, wraz z jednoczesnym pomiarem ciśnienia w komorze. Detekcja fazowa polegała natomiast na analizie zmian różnicy fazy światła lasera o polaryzacji s i p za pryzmatem oraz siatką odbiciową.
For this master's thesis, a phase plasmonic sensor was developed, enabling ultra-sensitive detection of changes in the refractive index. Plasmonic resonance was achieved with an incident laser beam on prism in Kretschmann configuration and also on the reflective grating, obtained from a modified DVD-R disc. In order to achieve more accurate measurements, the tested change in the refractive index was carried out in a vacuum chamber, allowing a controlled inflow of gases with known refractive indexes, along with the simultaneous measurement of the pressure in the chamber. Phase detection measured changes in the phase difference of the laser beam with the polarization s and p, reflected from the prism and the reflection grating.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Inne

na półce

Skocz do pozycji: 7.

Tytuł:: Plasmonic phase sensor - build and optimization
Fazowy sensor plazmonowy - budowa i optymalizacja
Autorzy:: Frydrychowicz, Adrianna
Opis:: This thesis aimed to create a highly sensitive refractive index phase sensor. Plasmonic resonance was achieved with an incident laser beam on prism in Kretschmann configuration and also on reflective grating made from split DVD-R disc covered with a thin layer of gold. The sensor of this type, with diffractive grating made from a modified DVD-R disc, was constructed for the first time.Refractive index sensitivity was measured according to change of s and p polarization phase difference, reflected from prism and diffraction grating. Sensor calibration based on observation of changes for air and nitrogen allowed us to estimate sensitivity at the level of 2 * 10^{-7} RIU (refractive index unit) for the sensor with prism and 5 * 10^{-8} RIU for the sensor with grating.
Celem pracy było stworzenie detektora plazmonowego o wysokiej czułości detekcji. Na potrzeby badań zbudowano od podstaw układ detektora fazowego, w którym rezonans plazmonowy był uzyskiwany poprzez oświetlenie wiązką lasera pryzmatu pokrytego warstwą złota o grubości kilkudziesięciu nanometrów oraz siatki dyfrakcyjnej w postaci rozwarstwionej płyty DVD-R, również pokrytej cienką warstwą złota. Sensor tego rodzaju, oparty na siatce dyfrakcyjnej w postaci zmodyfikowanej płyty DVD-R, był skonstruowany po raz pierwszy. Czułość na zmiany współczynnika załamania światła w badanym ośrodku sprawdzano na podstawie zmian różnicy fazy światła lasera o polaryzacji s i p, odbijanego od pryzmatu oraz siatki dyfrakcyjnej. Kalibracja detektora bazująca na obserwacji zmian wskazań dla powietrza i czystego azotu pozwoliła na oszacowanie czułości na poziomie 2 * 10^{-7} RIU (refractive index unit) dla sensora z pryzmatem oraz 5 * 10^{-8} RIU dla sensora z płytą.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Inne

na półce

Skocz do pozycji: 8.

Tytuł:: A microfluidic system for analysis of electrochemical processing using a highly sensitive optical fiber microcavity
Autorzy:: Śmietana, Mateusz
Janik, Monika
Krześniak, Andrzej
Koba, Marcin
Gabler, Tomasz
Jönsson-Niedziółka, Martin
Wydawca:: Elsevier
Cytata wydawnicza:: Optics and Lasers in Engineering 158 (2022) 107173. https://doi.org/10.1016/j.optlaseng.2022.107173
Opis:: National Science Centre Poland (NCN), NCN 2018/29/B/ST7/02552
Microfluidics provide unique possibilities to control tiny volumes of liquids and their composition. In this work we combined a microfluidic system with a microcavity in-line Mach-Zehnder interferometer (μIMZI) induced in the side surface of a single-mode optical fiber using a femtosecond laser micromachining. The μIMZI shows capability for investigating optical properties of volumes down to picoliters with an exceptionally high refractive index sensitivity. Here we report numerical analysis and experimental results that show that when the μIMZI is incorporated with the microfluidic system the measurements can be performed with sensitivity exceeding 14,000 nm/RIU which is similar to measurements done under static conditions. In a flow injection system, we show the influence of flow rate and injection volume on the response, and that the orientation of the cavity versus the flow direction has only a minor impact on the results. Finally, we have supported the system by band electrodes making it possible to induce redox reactions in the microchannel to detect the flowing products of the reactions optically. It has been found that thanks to the high sensitivity of the μIMZI the products of the reactions can be clearly detected both electrochemically and optically even when the only part of the flowing redox probe is oxidized at the band electrode. The capability for monitoring the products was shown for a standard redox probe, potassium ferricyanide, as well as for the neurotransmitter dopamine. This work shows that the proposed solution may offer highly sensitive optical measurements, even when the chemical reactions are not effective in the whole volume of the system.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: Refractive index sensor based on the micromachined side-hole optical fibre
Autorzy:: Kosturek, Rafał
Dudek, Michał
Zdanowicz, Mariusz
Jaroszewicz, Leszek R.
Osuch, Tomasz
Tematy:: fibre optic sensor
microcavity
refractive index
side-hole optical fibre
immersion liquid; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Powiązania:: https://bibliotekanauki.pl/articles/59112884.pdf Link otwiera się w nowym oknie
Opis:: An intensity-based refractive index (RI) sensor using a laser micromachined side-hole optical fibre (S-H OF) is presented in this paper. To achieve this, a microcavity was cut into a side surface of the S-H OF, providing access to one of the air holes within its structure. The geometrically modified fibre was then connected at both ends to a single-mode fibre for structure investigation in a system containing a supercontinuum laser and an optical signal analyser. In the next step, an immersion liquid was applied to a microcavity for RI values ranging from 1.30 to 1.57 in increments of 0.02. Power loss measurements were conducted for each RI value. Based on the obtained results, it can be concluded that an RI sensor has been successfully developed, which holds potential applications in biochemistry.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Numerical simulations of a simple refractive index sensor based on side-hole optical fibres
Autorzy:: Dudek, Michał
Köllő, Kinga K.
Tematy:: fibre optic sensor
finite-difference time-domain
numerical simulations
refractive index
side-hole optical fibre; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2174855.pdf Link otwiera się w nowym oknie
Opis:: In this work the influence of the cavity parameters on optical losses of a simple intensitybased in-line refractive index sensor utilizing a micromachined side-hole fibre was studied by means of numerical simulations. To perform these simulations, the Authors used the finite-difference time-domain method. The proposed sensor setup consists of light source, micromachined optical fibre as a sensor head, and a detector which makes it low-cost and easy to build. The changes of the external refractive index can be, therefore, recovered by direct measurements of the transmitted intensity from which insertion loss values can be calculated. By changing geometry of the cavity micromachined into the side-hole optical fibre, it was possible to determine its influence on the final sensor sensitivity and measurements range. Based on the provided analysis of simulations results, a simple fibre optic sensor can be fabricated mainly for sensing external liquids refractive index for application in biochemistry or healthcare.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Informacja

Wyszukujesz frazę "refractive index sensor" wg kryterium: Temat