Laser-written nanoporous silicon ridge waveguide for highly sensitive optical sensors

2012 ◽  
Vol 37 (2) ◽  
pp. 256 ◽  
Author(s):  
Jinan Xia ◽  
Andrea M. Rossi ◽  
Thomas E. Murphy
Keyword(s):  
Optical Sensors ◽  
Ridge Waveguide ◽  
Nanoporous Silicon ◽  
Highly Sensitive

scholarly journals Highly Sensitive Fluorescence Sensor for Carrageenan from a Composite Methylcellulose/Polyacrylate Membrane

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5043
Author(s):  
Riyadh Abdulmalek Hassan ◽  
Lee Yook Heng ◽  
Ling Ling Tan
Keyword(s):  
Composite Membrane ◽  
Optical Sensors ◽  
Optical Sensor ◽  
Detrimental Effect ◽  
Acrylic Polymer ◽  
Sulphated Polysaccharides ◽  
Highly Sensitive ◽  
Confectionery Products ◽  
Linear Manner ◽  
Better Than

Carrageenans are linear sulphated polysaccharides that are commonly added into confectionery products but may exert a detrimental effect to human health. A new and simpler way of carrageenan determination based on an optical sensor utilizing a methylcellulose/poly(n-butyl acrylate) (Mc/PnBA) composite membrane with immobilized methylene blue (MB) was developed. The hydrophilic Mc polymer membrane was successfully modified with a more hydrophobic acrylic polymer. This was to produce an insoluble membrane at room temperature where MB reagent could be immobilized to build an optical sensor for carrageenan analysis. The fluorescence intensity of MB in the composite membrane was found to be proportional to the carrageenan concentrations in a linear manner (1.0–20.0 mg L−1, R2 = 0.992) and with a detection limit at 0.4 mg L−1. Recovery of spiked carrageenan into commercial fruit juice products showed percentage recoveries between 90% and 102%. The optical sensor has the advantages of improved sensitivity and better selectivity to carrageenan when compared to other types of hydrocolloids. Its sensitivity was comparable to most sophisticated techniques for carageenan analysis but better than other types of optical sensors. Thus, this sensor provides a simple, rapid, and sensitive means for carageenan analysis.

Thin Chitosan Films for Optical Gas Sensors

2014 ◽  
Vol 605 ◽  
pp. 536-539 ◽  
Author(s):  
Alexander Y. Mironenko ◽  
Alexander A. Sergeev ◽  
Sergey Voznesensky ◽  
Svetlana Y. Bratskaya
Keyword(s):  
Gas Sensors ◽  
Optical Sensors ◽  
Linear Response ◽  
Gaseous Ammonia ◽  
Natural Polysaccharide ◽  
Highly Sensitive ◽  
Integrated Optical ◽  
Ammonia Detection ◽  
Chitosan Films ◽  
Highly Sensitive Detection

Here we report on fabrication of integrated-optical sensors for relative humidity and ammonia detection based on natural polysaccharide chitosan. The sensing properties of the fabricated sensor to gaseous ammonia are presented. The sensor exhibits a linear response in the range of 1-300 ppm with the response time less than 1 second. It has been shown that 1 μm-thick chitosan-based waveguide film allows highly sensitive detection of RH level.

Highly Sensitive Plasmonic Optical Sensors Based on Gold Core–Satellite Nanostructures Immobilized on Glass Substrates

2016 ◽  
Vol 8 (32) ◽  
pp. 20522-20526 ◽  
Author(s):  
Kentaro Ode ◽  
Mai Honjo ◽  
Yohei Takashima ◽  
Takaaki Tsuruoka ◽  
Kensuke Akamatsu
Keyword(s):  
Optical Sensors ◽  
Glass Substrates ◽  
Gold Core ◽  
Highly Sensitive

scholarly journals Water-stable Perovskite-loaded Nanogels Containing Antioxidant Property for Highly Sensitive and Selective Detection of Roxithromycin in Animal-derived Food Products

2021 ◽  
Author(s):  
Jinsol Han ◽  
Mirkomil Sharipov ◽  
Youngil Lee ◽  
Bui The Huy ◽  
YONG-ILL LEE ◽  
...  
Keyword(s):  
Optical Sensors ◽  
Limit Of Detection ◽  
Aqueous Media ◽  
Food Products ◽  
Antioxidant Property ◽  
Aqueous Solvent ◽  
Highly Sensitive ◽  
Antioxidant Function ◽  
Perovskite Nanoparticles ◽  
Enhanced Stability

Abstract Luminescent inorganic lead halide perovskite nanoparticles lack stability in aqueous solutions, which limits their application to optical sensors. Here, hybrid CsPbBr3-loaded MIP nanogels were developed with enhanced stability in aqueous media. Multifunctional MIP nanogels with antioxidant function and hydrophobic cavities were synthesized from HEMA derivatives in the presence of roxithromycin as a template. The CsPbBr3 nanoparticles were loaded into pre-synthesized MIP nanogels via in-situ synthesis with a size distribution of 200 nm. The developed CsPbBr3-nanogel exhibit excellent stability to air/moisture and enhanced stability toward an aqueous solvent. The developed CsPbBr3-loaded MIP nanogels showed a selective and sensitive detection of ROX with a limit of detection calculated to be 1.7 × 10− 5 µg/mL (20.6 pM). The developed CsPbBr3-loaded MIP antioxidant-nanogels were evaluated on practical application for quantitative determination of ROX antibiotic in animal-derived food products with excellent analytical performance. The detection of ROX in animal-derived food products showed good recovery results making them an ideal candidate for sensing ROX.

Multi-capillary based optical sensors for highly sensitive protein detection

2017 ◽  
Author(s):  
Yasuhira Okuyama ◽  
Takashi Katagiri ◽  
Yuji Matsuura
Keyword(s):  
Optical Sensors ◽  
Protein Detection ◽  
Highly Sensitive

Electrospun Nanofibrous Membranes for Highly Sensitive Optical Sensors

Nano Letters ◽  
2002 ◽  
Vol 2 (11) ◽  
pp. 1273-1275 ◽  
Author(s):  
Xianyan Wang ◽  
Christopher Drew ◽  
Soo-Hyoung Lee ◽  
Kris J. Senecal ◽  
Jayant Kumar ◽  
...  
Keyword(s):  
Optical Sensors ◽  
Highly Sensitive ◽  
Nanofibrous Membranes

scholarly journals Single-Mode Polymer Ridge Waveguide Integration of Organic Thin-Film Laser

2020 ◽  
Vol 10 (8) ◽  
pp. 2805 ◽  
Author(s):  
Marko Čehovski ◽  
Jing Becker ◽  
Ouacef Charfi ◽  
Hans-Hermann Johannes ◽  
Claas Müller ◽  
...  
Keyword(s):  
Thin Film ◽  
Optical Sensors ◽  
Pump Energy ◽  
Single Mode ◽  
Ridge Waveguide ◽  
Core Material ◽  
Small Scale ◽  
Organic Thin Film ◽  
Waveguide Laser ◽  
Space Optics

Organic thin-film lasers (OLAS) are promising optical sources when it comes to flexibility and small-scale manufacturing. These properties are required especially for integrating organic thin-film lasers into single-mode waveguides. Optical sensors based on single-mode ridge waveguide systems, especially for Lab-on-a-chip (LoC) applications, usually need external laser sources, free-space optics, and coupling structures, which suffer from coupling losses and mechanical stabilization problems. In this paper, we report on the first successful integration of organic thin-film lasers directly into polymeric single-mode ridge waveguides forming a monolithic laser device for LoC applications. The integrated waveguide laser is achieved by three production steps: nanoimprint of Bragg gratings onto the waveguide cladding material EpoClad, UV-Lithography of the waveguide core material EpoCore, and thermal evaporation of the OLAS material Alq3:DCM2 on top of the single-mode waveguides and the Bragg grating area. Here, the laser light is analyzed out of the waveguide facet with optical spectroscopy presenting single-mode characteristics even with high pump energy densities. This kind of integrated waveguide laser is very suitable for photonic LoC applications based on intensity and interferometric sensors where single-mode operation is required.

Refractive Index Estimation of Nanoporous Silicon in Visible and Near-Infrared Spectrum Range

2013 ◽  
Vol 710 ◽  
pp. 8-12
Author(s):  
Wei Qiang ◽  
Jin An Xia ◽  
Chun Rui Wang ◽  
Xiao Yan Zhang
Keyword(s):  
Refractive Index ◽  
Infrared Spectrum ◽  
Optical Sensors ◽  
Communication Systems ◽  
Near Infrared ◽  
Electrochemical Etching ◽  
Calculated Data ◽  
Nanoporous Silicon ◽  
Spectrum Range ◽  
Near Infrared Spectrum

In this paper, we use Bruggeman model to calculate refractive index of nanoporous silicon, which was fabricated by electrochemical etching. The calculated result shows that the refractive index of the nanoporous silicon decreases linearly with increasing porosity and etching current density. In addition, the refractive index of nanoporous silicon was also measured by spectroscopic ellipsometry in the visible light spectrum range. The measured refractive index and extinction coefficient were in agreement with the calculated data, after being modified by the refractive index modified model of heavily doped silicon. In particular, we estimate the refractive index at the optical wavelengths in visible and near-infrared spectrum ranges, which may be widely used in various types of optical sensors and optoelectronic devices for optical communication systems.

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