Label‐free superresolution effect of nonlinear reverse saturation absorption thin films through difference method

2019 ◽  
Vol 276 (2) ◽  
pp. 82-88
Author(s):  
C. DING ◽  
J. WEI
Keyword(s):  
Thin Films ◽  
Difference Method ◽  
Label Free ◽  
Reverse Saturation Absorption ◽  
Saturation Absorption

Ultrafast broadband reverse saturation absorption in Al-doped InSe thin films for optical limiting at visible/near-infrared

2020 ◽  
Vol 108 ◽  
pp. 110171 ◽  
Author(s):  
Xiaoyan Yan ◽  
Xingzhi Wu ◽  
Yu Fang ◽  
Wenjun Sun ◽  
Chengbao Yao ◽  
...  
Keyword(s):  
Thin Films ◽  
Near Infrared ◽  
Optical Limiting ◽  
Reverse Saturation Absorption ◽  
Saturation Absorption

scholarly journals Universal Fabrication of Highly Efficient Plasmonic Thin‐Films for Label‐Free SERS Detection

Small ◽  
2021 ◽  
pp. 2100755
Author(s):  
Sara Gullace ◽  
Verónica Montes‐García ◽  
Victor Martín ◽  
David Larios ◽  
Valentina Girelli Consolaro ◽  
...  
Keyword(s):  
Thin Films ◽  
Label Free ◽  
Highly Efficient ◽  
Sers Detection

scholarly journals Capacitive Field-effect (bio-)chemical Sensors Based on Nanocrystalline Diamond Films

2009 ◽  
Vol 1203 ◽  
Author(s):  
Matthias Bäcker ◽  
Arshak Poghossian ◽  
Maryam H. Abouzar ◽  
Sylvia Wenmackers ◽  
Stoffel D. Janssens ◽  
...  
Keyword(s):  
Thin Films ◽  
Field Effect ◽  
High Sensitivity ◽  
Ph Sensitive ◽  
Nanocrystalline Diamond ◽  
Penicillin G ◽  
Layer By Layer ◽  
Label Free ◽  
High Coverage ◽  
Layer Adsorption

AbstractCapacitive field-effect electrolyte-diamond-insulator-semiconductor (EDIS) structures with O-terminated nanocrystalline diamond (NCD) as sensitive gate material have been realized and investigated for the detection of pH, penicillin concentration, and layer-by-layer adsorption of polyelectrolytes. The surface oxidizing procedure of NCD thin films as well as the seeding and NCD growth process on a Si-SiO2 substrate have been improved to provide high pH-sensitive, non-porous thin films without damage of the underlying SiO2 layer and with a high coverage of O-terminated sites. The NCD surface topography, roughness, and coverage of the surface groups have been characterized by SEM, AFM and XPS methods. The EDIS sensors with O-terminated NCD film treated in oxidizing boiling mixture for 45 min show a pH sensitivity of about 50 mV/pH. The pH-sensitive properties of the NCD have been used to develop an EDIS-based penicillin biosensor with high sensitivity (65-70 mV/decade in the concentration range of 0.25-2.5 mM penicillin G) and low detection limit (5 μM). The results of label-free electrical detection of layer-by-layer adsorption of charged polyelectrolytes are presented, too.

OPTICAL AND STRUCTURAL PROPERTIES OF SILVER NANOPARTICLES EMBEDDED IN INDIUM OXIDE FILMS

2011 ◽  
Vol 10 (03) ◽  
pp. 433-440 ◽  
Author(s):  
A. A. DAKHEL ◽  
F. Z. HENARI
Keyword(s):  
Indium Oxide ◽  
Nonlinear Optical ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Third Order ◽  
X Ray ◽  
Reverse Saturation Absorption ◽  
Saturation Absorption ◽  
Order Susceptibility ◽  
Nanoparticles Of Silver

Nanoparticles of silver-embedded indium oxide thin films have been prepared on glass and silicon substrates. Silver concentration were 3 wt.% and 5 wt.% as measured by X-ray fluorescence. X-ray diffraction reveals that indium oxide of these samples remains amorphous even after pre-annealing at 400°C. The optical absorption of the samples manifests the surface plasmon resonance (SPR) phenomena, which varies with Ag content. The Ag nanoparticles radius was estimated with Mie classical theory by using the SPR data analysis. The nonlinear optical properties of films on glass substrate were investigated using z-scan technique. Under cw excitation the films exhibit large reverse saturation absorption and negative nonlinearities. The real and imaginary parts of third order susceptibility of the samples were measured and the imaginary part which arise from the change in absorption is found to be dominant.

scholarly journals Plasmonics for Biosensing

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1411 ◽  
Author(s):  
Xue Han ◽  
Kun Liu ◽  
Changsen Sun
Keyword(s):  
Thin Films ◽  
Molecular Level ◽  
Point Of Care ◽  
High Sensitivity ◽  
Short Review ◽  
Dynamic Monitoring ◽  
Label Free ◽  
Plasmonic Resonance ◽  
Hybrid Functions ◽  
Resonance Modes

Techniques based on plasmonic resonance can provide label-free, signal enhanced, and real-time sensing means for bioparticles and bioprocesses at the molecular level. With the development in nanofabrication and material science, plasmonics based on synthesized nanoparticles and manufactured nano-patterns in thin films have been prosperously explored. In this short review, resonance modes, materials, and hybrid functions by simultaneously using electrical conductivity for plasmonic biosensing techniques are exclusively reviewed for designs containing nanovoids in thin films. This type of plasmonic biosensors provide prominent potential to achieve integrated lab-on-a-chip which is capable of transporting and detecting minute of multiple bio-analytes with extremely high sensitivity, selectivity, multi-channel and dynamic monitoring for the next generation of point-of-care devices.

scholarly journals A Review of Refractometric Sensors Based on Long Period Fibre Gratings

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
G. Rego
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Transition Region ◽  
Food Quality ◽  
Scientific Community ◽  
Surrounding Medium ◽  
Quality And Safety ◽  
Label Free ◽  
Long Period ◽  
Food Quality And Safety

In the last decade refractometric sensors have attracted an increasing interest by the scientific community due to their ability to perform ambient monitoring, to assess food quality and safety, and also to the fact that they enable the development of label free sensors in the biomedical area. These advances result, namely, from the use of long period fibre gratings in the turning points and/or with thin films in the transition region that allows resolutions of 10−6to changes in the refractive index of the surrounding medium. Resolutions exceeding 10−8can also be achieved when long period fibre gratings are combined with evanescent field based devices. This paper reviews the recent path towards the development of ultrahigh sensitive optical fibre refractometric sensors.

scholarly journals SOME ASPECTS OF THE MATERIALS’ OPTICAL LIMITING FEATURES

2020 ◽  
Vol 1 ◽  
pp. 33-36
Author(s):  
Natalia Kamanina
Keyword(s):  
High Frequency ◽  
Kerr Effect ◽  
Optical Limiting ◽  
Reverse Saturation Absorption ◽  
High Laser ◽  
Effective Use ◽  
Human Eyes ◽  
Saturation Absorption ◽  
Display Technique ◽  
Good Coincidence

Due to the effective use of the fullerenes and other nanoparticles in the materials for the general optoelectronic, laser and display technique, as well as for biomedicine, the different mechanisms to attenuate the light intensity are considered with good advantage in order to protect the human eyes and technical devises from high laser irradiation. Reverse saturation absorption, complex formation, scattering, etc. are taken into account. In the current paper the influence of the content of the nanoobjects on the interface relief is shown and considered as an additional possible optical limiting mechanism. Moreover, the diffraction from the nanostructured materials via high frequency Kerr effect is added to extend the numbers of the optical limiting mechanisms. Different experimental instruments and supporting models are presented. VIS lasers, AFM, OCA devises are applied to test and visualize the results. Theoretical and experimental data are in good coincidence.

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