scholarly journals Preparation and Application of Metal Nanoparticals Elaborated Fiber Sensors

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5155
Author(s):  
Jin Li ◽  
Haoru Wang ◽  
Zhi Li ◽  
Zhengcheng Su ◽  
Yue Zhu
Keyword(s):  
Optical Fiber ◽  
Ph Value ◽  
Hot Spot ◽  
Incident Light ◽  
Environmental Parameters ◽  
Optical Diffraction ◽  
Nano Particles ◽  
Physical Parameters ◽  
Compact Structure ◽  
Metal Nano Particles

In recent years, surface plasmon resonance devices (SPR, or named plamonics) have attracted much more attention because of their great prospects in breaking through the optical diffraction limit and developing new photons and sensing devices. At the same time, the combination of SPR and optical fiber promotes the development of the compact micro-probes with high-performance and the integration of fiber and planar waveguide. Different from the long-range SPR of planar metal nano-films, the local-SPR (LSPR) effect can be excited by incident light on the surface of nano-scaled metal particles, resulting in local enhanced light field, i.e., optical hot spot. Metal nano-particles-modified optical fiber LSPR sensor has high sensitivity and compact structure, which can realize the real-time monitoring of physical parameters, environmental parameters (temperature, humidity), and biochemical molecules (pH value, gas-liquid concentration, protein molecules, viruses). In this paper, both fabrication and application of the metal nano-particles modified optical fiber LSPR sensor probe are reviewed, and its future development is predicted.

Effect of TEOS addition on formation of Au metal nano-particles in the Au-doped optical fiber and its optical nonlinearity

2010 ◽  
Vol 356 (44-49) ◽  
pp. 2578-2582 ◽  
Author(s):  
Seongmin Ju ◽  
Pramod R. Watekar ◽  
Seong Gu Kang ◽  
Jun-Ki Chung ◽  
Cheol Jin Kim ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Nonlinearity ◽  
Nano Particles ◽  
Metal Nano Particles

NONLINEAR OPTICAL PROPERTIES OF ZINC DOPED GERMANO-SILICATE GLASS OPTICAL FIBER

2010 ◽  
Vol 19 (04) ◽  
pp. 791-799 ◽  
Author(s):  
SEONGMIN JU ◽  
PRAMOD R. WATEKAR ◽  
SEONGMOOK JEONG ◽  
YOUNGWOONG KIM ◽  
WON-TAEK HAN
Keyword(s):  
Optical Fiber ◽  
Silicate Glass ◽  
Continuous Wave ◽  
Chemical Vapor ◽  
Average Diameter ◽  
Nano Particles ◽  
Modulation Method ◽  
Transmission Electron ◽  
Average Size ◽  
Metal Nano Particles

Zinc doped germano-silicate glass optical fiber was developed by using the modified chemical vapor deposition and the drawing tower process. Absorption peaks of the germano-silicate glass optical fiber preform appeared at 240 nm and 330 nm were due to the incorporated Zn metal nano-particles (MNPs) and ZnO semiconductor nano-particles (SNPs), respectively and the average diameter of nano-particles (NPs) was estimated to be about 2 nm by transmission electron microscopy. However, the absorption peak of the zinc doped optical fiber due to ZnO SNPs was found to appear at 490 nm red-shifted from 330 nm can be explained by the increase in average size of ZnO SNPs in the fiber core due to growth or recrystallization of ZnO SNPs during the fiber drawing process about 2150°C. The nonlinear refractive index coefficient, n2, of the fiber was estimated to be 5.62 × 10-20 m2/W due to the stable dispersion of ZnO SNPs using the continuous-wave self-phase modulation method.

Metal Nano Particles Formation on Rotating Powder (NPP) Substrate in Physical Vapor Deposition

2015 ◽  
Vol 1119 ◽  
pp. 3-8
Author(s):  
Seok Keun Koh ◽  
Charles Lee ◽  
Jung Hwan Lee ◽  
Byung Kwuan Kang ◽  
Hiroyuki Kaji ◽  
...  
Keyword(s):  
Thin Film ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Film Growth ◽  
Uv Spectroscopy ◽  
Thin Film Growth ◽  
Nano Particles ◽  
Physical Parameters ◽  
Metal Evaporation ◽  
Metal Nano Particles

Nano-sized (2~10 nm) metal particles were formed and accumulated on a rotating powders substrate by conventional physical vapor deposition (PVD) process. Sucrose was selected as a supporter for the nano-particles on powder (NPP) process. Nuclei, which were formed on the substrate from vaporized or sputtered metal atoms at an initial thin film growth, did not grow up to coalescence stage and did not agglomerate each other when the powder in the vessel was continuously circulated during the deposition. Size of the nanoparticles is controlled by the physical parameters such as metal evaporation rate, rotation speed of the powder, selection of the powder in the PVD. Formation mechanism of nano-particles on the carrier powder have been explained in terms of thermodynamics with TEM, SEM, EDX, UV spectroscopy, etc. comparing with conventional thin film growth in PVD.

scholarly journals How Can We Adapt Thermal Comfort for Disabled Patients? A Case Study of French Healthcare Buildings in Summer

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4530
Author(s):  
Youcef Bouzidi ◽  
Zoubayre El Akili ◽  
Antoine Gademer ◽  
Nacef Tazi ◽  
Adil Chahboun
Keyword(s):  
Thermal Comfort ◽  
Thermal Environment ◽  
Residential Buildings ◽  
Linear Regression Analysis ◽  
Environmental Parameters ◽  
Physical Parameters ◽  
Mean Radiant Temperature ◽  
Operative Temperature ◽  
Neutral Temperature ◽  
Radiant Temperature

This paper investigates adaptive thermal comfort during summer in medical residences that are located in the French city of Troyes and managed by the Association of Parents of Disabled Children (APEI). Thermal comfort in these buildings is evaluated using subjective measurements and objective physical parameters. The thermal sensations of respondents were determined by questionnaires, while thermal comfort was estimated using the predicted mean vote (PMV) model. Indoor environmental parameters (relative humidity, mean radiant temperature, air temperature, and air velocity) were measured using a thermal environment sensor during the summer period in July and August 2018. A good correlation was found between operative temperature, mean radiant temperature, and PMV. The neutral temperature was determined by linear regression analysis of the operative temperature and Fanger’s PMV model. The obtained neutral temperature is 23.7 °C. Based on the datasets and questionnaires, the adaptive coefficient α representing patients’ capacity to adapt to heat was found to be 1.261. A strong correlation was also observed between the sequential thermal index n(t) and the adaptive temperature. Finally, a new empirical model of adaptive temperature was developed using the data collected from a longitudinal survey in four residential buildings of APEI in summer, and the obtained adaptive temperature is 25.0 °C with upper and lower limits of 24.7 °C and 25.4 °C.

scholarly journals Simultaneous Measurement of Temperature and Refractive Index Using High Temperature Resistant Pure Quartz Grating Based on Femtosecond Laser and HF Etching

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1028
Author(s):  
Na Zhao ◽  
Qijing Lin ◽  
Kun Yao ◽  
Fuzheng Zhang ◽  
Bian Tian ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Temperature ◽  
Femtosecond Laser ◽  
Optical Fiber ◽  
Temperature Response ◽  
High Sensitivity ◽  
Xrd Analysis ◽  
Refractive Index Sensor ◽  
Compact Structure ◽  
Fluid Analysis

The optical fiber temperature and refractive index sensor combined with the hollow needle structure for medical treatment can promote the standardization of traditional acupuncture techniques and improve the accuracy of body fluid analysis. A double-parameter sensor based on fiber Bragg grating (FBG) is developed in this paper. The sensor materials are selected through X-ray diffraction (XRD) analysis, and the sensor sensing principle is theoretically analyzed and simulated. Through femtosecond laser writing pure silica fiber, a high temperature resistant wavelength type FBG temperature sensor is obtained, and the FBG is corroded by hydrofluoric acid (HF) to realize a high-sensitivity intensity-type refractive index sensor. Because the light has dual characteristics of energy and wavelength, the sensor can realize simultaneous dual-parameter sensing. The light from the lead-in optical fiber is transmitted to the sensor and affected by temperature and refractive-index; then, the reflection peak is reflected back to the lead-out fiber by the FBG. The high temperature response and the refractive index response of the sensor were measured in the laboratory, and the high temperature characteristics of the sensor were verified in the accredited institute. It is demonstrated that the proposed sensor can achieve temperature sensing up to 1150 °C with the sensitivity of 0.0134 nm/°C, and refractive sensing over a refractive range of 1.333 to 1.4027 with the sensitivity of −49.044 dBm/RIU. The sensor features the advantages of two-parameter measurement, compact structure, and wide temperature range, and it exhibits great potential in acupuncture treatment.

Silicon Micro-Photonic Structure for Ultra-Sensitive Biosensing

2003 ◽  
Vol 797 ◽  
Author(s):  
Bradley Schmidt ◽  
Vilson Almeida ◽  
Christina Manolatou ◽  
Stefan Preble ◽  
Michal Lipson
Keyword(s):  
Nano Particles ◽  
Particle Detection ◽  
Strong Light ◽  
Extinction Cross Section ◽  
Low Concentrations ◽  
Silicon Photonic ◽  
Micron Size ◽  
Planar Silicon ◽  
Single Particle Detection ◽  
Metal Nano Particles

ABSTRACTWe demonstrate a micron-size planar silicon photonic device that is able to detect low concentrations of metal nano-particles approaching single particle detection. This sensitivity is achieved by using strong light confining structures that enhance the extinction cross-section of metal nano-particles by orders of magnitude. Structures were fabricated and measurements of the transmission spectra of the devices demonstrate the detection of 10 nm diameter gold particles resting on the device with a density of fewer than 2 particles per 104 nm2 (the area of the sensing region surface). Using such a device, in a fluidic platform, one could detect the presence of a single metal nano-particle specifically bound to various analytes, enabling ultrasensitive detection of analytes including DNA, RNA, proteins, and antigens.

Sign in / Sign up

Export Citation Format

Share Document