10-09-2012 | Ethiraju Babu, Paulpandian Muthu Mareeswaran, Seenivasan Rajagopal, Journal of Fluorescence, 2012

We describe here the construction of a sensitive and selective optical sensor system for the detection of human α-thrombin. The surface functionalized luminescent [Ru(dpsphen)3]4− (dpsphen-4,7-diphenyl-1,10-phenanthroline disulfonate) ion doped silica nanoparticles (SiNPs) with a size ~70 nm ...

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05-09-2012 | Francesco Ricci; Alexis Vallée-Bélisle; Alessandro Porchetta; Kevin W. Plaxco, Journal of the American Chemical Society, 2012

The population-shift mechanism can be used for rational re-engineering of structure-switching biosensors to enable their allosteric inhibition and activation. As a proof-of-principle example of this, we have introduced distal allosteric sites into molecular beacons, which are optical sensors ...

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05-09-2012 | Bilro, Lúcia ; Alberto, Nélia ; Pinto, João L. ; Nogueira, Rogério, Sensors, 2012

The recent advances of polymer technology allowed the introduction of plastic optical fiber in sensor design. The advantages of optical metrology with plastic optical fiber have attracted the attention of the scientific community, as they allow the development of low-cost or cost competitive ...

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03-09-2012 | Zhang, Xinping ; Feng, Shengfei ; Zhang, Jian ; Zhai, Tianrui ; Liu, Hongmei ; Pang, Zhaoguang, Sensors, 2012

An optical sensor based on the coupling between the plasmonic and photonic resonance modes in metallic photonic crystals is investigated. Large-area metallic photonic crystals consisting of periodically arranged gold nanostructures with dimensions down to sub-100 nm are fabricated using ...

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21-08-2012 | Zeng, Rong ; Wang, Bo ; Niu, Ben ; Yu, Zhanqing, Sensors, 2012

The measurement of intense E-fields is a fundamental need in various research areas. Integrated optical E-field sensors (IOESs) have important advantages and are potentially suitable for intense E-field detection. This paper comprehensively reviews the development and applications of several ...

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20-08-2012 | M.M. Erenas, K. Cantrell, J. Ballesta-Claver, I. de Orbe-Payá, L.F. Capitán-Vallvey, Sensors and Actuators B: Chemical, 2012

In this paper the hue, or H component of the HSV (Hue, Saturation, Value) color space, is used as analytical parameter for bitonal optical sensors. This parameter is characterized by its robustness to variations in the imaging device, illuminant, and sensor membrane. It has a higher ...

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13-08-2012 | S.V. Pham, M. Dijkstra, A.J.F. Hollink, L.J. Kauppinen, R.M. de Ridder, M. Pollnau, P.V. Lambeck, H.J.W.M. Ho ..., Sensors and Actuators B: Chemical, 2012

A theoretical and experimental evaluation is given of a principle of direct, label-free opto-chemical sensing. According to this principle, which is applicable in compact planar optical sensors, measurand-induced wavelength shifts of the sharp fringes in the transmission spectra near the ...

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11-08-2012 | Abel Santos, Victor S Balderrama, María Alba, Pilar Formentín, Josep Ferré-Borrull, Josep Pallarès, Lluís F Marsal, Nanoscale Research Letters, 2012

Here, we present a systematic study about the effect of the pore length and its diameter on the specular reflection in nanoporous anodic alumina. As we demonstrate, the specular reflection can be controlled at will by structural tuning (i.e., by designing the pore geometry). This makes it ...

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10-08-2012 | Rachel C. Evans; Matti Knaapila; Niamh Willis-Fox; Mario Kraft; Ann Terry; Hugh D. Burrows; Ullrich Scherf, Langmuir, 2012

The absorption and photoluminescence spectra of the cationic conjugated polyelectrolyte poly[3-(6-trimethylammoniumhexyl)thiophene] (P3TMAHT) were observed to be dramatically altered in the presence of anionic surfactants due to self-assembly through ionic complex formation. Small-angle ...

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25-07-2012 | Fangyuan Zhao; Tianrong Zhan; Gaoshan Huang; Yongfeng Mei; Xinhua Hu, Lab on a Chip, 2012

Rolled-up tubular optical microcavities are a novel type of optical sensors for identifying different liquids. Based on a Mie scattering method, we study systematically the optical resonances and liquid sensing capability of microtubes. Analytical formulas are presented to calculate the ...

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