Organic Ligand-Mediated Synthesis of Shape-Tunable Gold Nanoparticles:  An Application of Their Thin Film as Refractive Index Sensors

2007 ◽  
Vol 111 (27) ◽  
pp. 9684-9693 ◽  
Author(s):  
Md. Harunar Rashid ◽  
Rama Ranjan Bhattacharjee ◽  
Tarun K. Mandal
Keyword(s):  
Thin Film ◽  
Gold Nanoparticles ◽  
Refractive Index ◽  
Organic Ligand ◽  
Refractive Index Sensors

Response Properties of Waveguide-Optic Evanescent Field Refractive Index Sensors According to Titanium Dioxide Thin Film Conditions

2010 ◽  
Vol 8 (3) ◽  
pp. 431-435 ◽  
Author(s):  
S. W. Kwon ◽  
W. S. Yang ◽  
H. M. Lee ◽  
W. K. Kim ◽  
H.-Y. Lee ◽  
...  
Keyword(s):  
Thin Film ◽  
Refractive Index ◽  
Titanium Dioxide ◽  
Evanescent Field ◽  
Response Properties ◽  
Refractive Index Sensors

Gold nanoparticles in ethanol deposited on PCF for refractive index sensors

2020 ◽  
Author(s):  
Makram A. Fakhri ◽  
Zainab H. Tawfiq ◽  
Salah A. Adnan
Keyword(s):  
Gold Nanoparticles ◽  
Refractive Index ◽  
Refractive Index Sensors

scholarly journals Photo-Aligned Nematic Liquid Crystals Enable the Modulation of Thermoplasmonic Heating

2021 ◽  
Vol 11 (14) ◽  
pp. 6272
Author(s):  
Giovanna Palermo ◽  
Rossella Grillo ◽  
Luigia Pezzi ◽  
Thomas Bürgi ◽  
Nelson Tabiryan ◽  
...  
Keyword(s):  
Thin Film ◽  
Gold Nanoparticles ◽  
Refractive Index ◽  
Liquid Crystal ◽  
Single Layer ◽  
Organic Layer ◽  
Molecular Reorientation ◽  
Index Value ◽  
Director Reorientation ◽  
Director Orientation

We experimentally demonstrate that the plasmonic heat delivered by a single layer of homogeneously distributed gold nanoparticles (AuNPs), immobilized on a glass substrate, can be optically tuned by taking advantage of the properties of an organic layer based on azobenzene and nematic liquid crystal (NLC) molecules. The effect, which exploits the dependence of the NLC refractive index value on the molecular director orientation, is realized using the polarization-dependent, light-induced molecular reorientation of a thin film of photo-aligning material that the NLC is in contact with. The reversibility of the optically induced molecular director reorientation of the NLC enables an active modulation of the plasmonic photo-induced heat.

Size effect of gold nanoparticles on optical microfiber refractive index sensors

2011 ◽  
Author(s):  
Ying Cui ◽  
Perry Ping Shum ◽  
Guanghui Wang ◽  
Hong Chang ◽  
Xuan Quyen Dinh ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Refractive Index ◽  
Size Effect ◽  
Refractive Index Sensors ◽  
Optical Microfiber

Refractive Index Sensors using Polarization-independent Metamaterial

2017 ◽  
Vol 137 (11) ◽  
pp. 415-416 ◽  
Author(s):  
Tomoki Shimizu ◽  
Yoshiaki Kanamori ◽  
Kazuhiro Hane
Keyword(s):  
Refractive Index ◽  
Refractive Index Sensors ◽  
Polarization Independent

scholarly journals Synthesis, Crystallography, Microstructure, Crystal Defects, Optical and Optoelectronic Properties of ZnO:CeO2 Mixed Oxide Thin Films

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 112
Author(s):  
Qais M. Al-Bataineh ◽  
Mahmoud Telfah ◽  
Ahmad A. Ahmad ◽  
Ahmad M. Alsaad ◽  
Issam A. Qattan ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Refractive Index ◽  
Mixed Oxide ◽  
Visible Region ◽  
Functional Materials ◽  
Crystal Defects ◽  
Optoelectronic Properties ◽  
Oxide Thin Films ◽  
Pure Ceo2

We report the synthesis and characterization of pure ZnO, pure CeO2, and ZnO:CeO2 mixed oxide thin films dip-coated on glass substrates using a sol-gel technique. The structural properties of as-prepared thin film are investigated using the XRD technique. In particular, pure ZnO thin film is found to exhibit a hexagonal structure, while pure CeO2 thin film is found to exhibit a fluorite cubic structure. The diffraction patterns also show the formation of mixed oxide materials containing well-dispersed phases of semi-crystalline nature from both constituent oxides. Furthermore, optical properties of thin films are investigated by performing UV–Vis spectrophotometer measurements. In the visible region, transmittance of all investigated thin films attains values as high as 85%. Moreover, refractive index of pure ZnO film was found to exhibit values ranging between 1.57 and 1.85 while for CeO2 thin film, it exhibits values ranging between 1.73 and 2.25 as the wavelength of incident light decreases from 700 nm to 400 nm. Remarkably, refractive index of ZnO:CeO2 mixed oxide-thin films are tuned by controlling the concentration of CeO2 properly. Mixed oxide-thin films of controllable refractive indices constitute an important class of smart functional materials. We have also investigated the optoelectronic and dispersion properties of ZnO:CeO2 mixed oxide-thin films by employing well-established classical models. The melodramatic boost of optical and optoelectronic properties of ZnO:CeO2 mixed oxide thin films establish a strong ground to modify these properties in a skillful manner enabling their use as key potential candidates for the fabrication of scaled optoelectronic devices and thin film transistors.

Strain, torsion and refractive index sensors based on helical long period fibre grating inscribed in small-core fibre for structural condition monitoring

2021 ◽  
Vol 24 (6) ◽  
pp. 1248-1255
Author(s):  
Cailing Fu ◽  
Yi-Qing Ni ◽  
Tong Sun ◽  
Yiping Wang ◽  
Siqi Ding ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Single Mode ◽  
Structural Condition ◽  
Core Diameter ◽  
Small Core ◽  
Long Period ◽  
Sensing Applications ◽  
Core Fibre ◽  
Refractive Index Sensors

This study is intended to develop long period fibre grating sensors for potential applications in environmental and durability monitoring of coastal structures. High-quality helical long period fibre gratings (HLPFGs) are inscribed in different types of small-core single mode fibre (SMF) by use of hydrogen-oxygen flame heating technique. A detailed investigation of the effect of core diameter on their transmission spectrum and optimum length of the HLPFG has been pursued. A longer length is required to achieve the same coupling attenuation in a smaller-core SMF than that of a larger-core fibre. The strain, torsion and refractive index (RI) properties of the HLPFG is investigated experimentally to develop a high-sensitivity sensor. The experimental results show that the strain sensitivity could be enhanced by means of employing a larger-core diameter SMF. Moreover, the HLFPGs are also sensitive to the torsion and external RI. Hence, such HLFPGs have great potential for sensing applications.

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