Holographic sensors for the detection of bacterial spores

Bhatta, D.; Christie, Graham; Madrigal-González, B.; Blyth, Jeff; Lowe, Christopher R.

doi:10.1016/j.bios.2007.06.006

Cited by 28 publications

(27 citation statements)

References 27 publications

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“…They can function as gratings, lenses, beam splitters, spectral filters, shear elements, achromats, mirrors, birefringent elements, and multi-function elements. They can be used, for example, in optical sensors [1][2][3][4][5][6][7], fibre-optics [8][9][10][11], optical scanners [12][13][14], optical disk pick-up heads [15][16] as well as holographic concentrators [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications

Akbari¹,

Naydenova²,

Martin³

2014

Appl. Opt.

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A holographic device is under development that aims to improve light collection in solar cells. The aim is to explore the potential of using photopolymer Holographic Optical Elements (HOE) to collect light from a moving source, such as the sun, and re-direct it for concentration by a holographic lens.. A working range of 45 degrees is targeted for such a device to be useful in solar applications without tracking. A photopolymer HOE is capable of efficiently re-directing light, but the angular selectivity of a single grating is usually of the order of one degree at the thicknesses required for high efficiency. The challenge here is to increase the angular and wavelength range of the gratings so that a reasonable number may be multiplexed and/or combined to provide a device that can concentrate light incident from a large range of angles. In this paper low spatial frequency holographic recording is explored in order to increase the angular and wavelength range of an individual grating. Ultimately, a combination of gratings will be used so that a broad range of angles of incidence are accepted. A design is proposed for the combination of such elements into a holographic solar collector. The first step in achieving this is optimization of recording at low spatial frequency. This requires a photopolymer material with unique properties, such as a fast monomer diffusion rate. This paper reports results on the efficiency of holograms recorded in an acrylamide based photopolymer at low spatial frequencies (100, 200 and 300 l/mm). The diffraction efficiency and angular selectivity of recorded holograms have been studied for various photopolymer layer thicknesses and different intensities of the recording beams. A diffraction efficiency of over 80% was achieved at a spatial frequency of 200 l/mm. The optimum intensity of recording at this spatial frequency was found to be 1 mW/cm 2 . Individual gratings and focusing elements with high efficiency and FWHM angles of 3 o are experimentally demonstrated.

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Section: Introductionmentioning

confidence: 99%

Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications

Akbari¹,

Naydenova²,

Martin³

2014

Appl. Opt.

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“…The process of detection involves a change in the optical characteristics of the hologram caused by the interaction of the analyte with the support medium. The main effort in the development of holographic sensors for visual detection has been focused on reflection holographic sensors [72][73][74][75][76] and on optimization of the support medium to be analyte specific. The principle of operation of these holographic sensors [72][73][74][75][76] relies mainly on swelling/shrinking of the hologram support medium as a result of the exposure to the analyte and this leads to a visually observable change of the color of the light reflected by the hologram.…”

Section: Holographic Sensors Based On Zeolitesmentioning

confidence: 99%

Progress in zeolite synthesis promotes advanced applications

Zaarour

Dong

Naydenova³

et al. 2014

Microporous and Mesoporous Materials

160

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a b s t r a c tThis article outlines the importance of zeolite synthesis and their unique physicochemical characteristics promoting advanced applications. The main strategies for preparation of zeolites including organic-template assisted, organic-template free and alternative procedures are considered for synthesis of crystallites offering control and fine-tuning of their properties. Besides, rational design of zeolites with pre-determined structure, porosity, size, morphology, and composition are more viable by studying carefully the chemical and physical parameters controlling the zeolite synthesis and understanding the crystallization mechanism. Finally, a particular attention to the preparation of zeolites with nanosized dimensions and their utilization in innovative applications including photovoltaic, medicine and holographic sensors are presented.

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“…Instead, automated platforms such as the multiplexed immunoassay system and multiple reaction monitoring 74 are more likely candidates as clinically-friendly platforms which have already shown some promise. Also holographic sensors have already been employed for detection of biological materials 75 and molecules [76][77][78] and could therefore be adapted as a robust and comprehensive readout of a biomarker signature in clinical applications.…”

Section: The Development Of Biomarker Assays For Psychiatric Disordersmentioning

confidence: 99%

Testes sanguíneos de biomarcadores para diagnóstico e tratamento de desordens mentais: foco em esquizofrenia

Bahn¹,

Schwarz

Harris

et al. 2012

Arch. Clin. Psychiatry (São Paulo)

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A descoberta e a aplicação clínica de biomarcadores para desordens mentais são confrontadas com muitos desafios. Em geral, os atuais métodos de descoberta e validação de biomarcadores não produziram os resultados que foram inicialmente aguardados depois da finalização do Projeto Genoma Humano. Isso se deve principalmente à falta de processos padronizados conectando a descoberta de marcadores com tecnologias para a validação e a tradução para uma plataforma que ofereça precisão e fácil uso em clínica. Como consequência, a maior parte dos psiquiatras e praticantes em geral são relutantes em aceitar que testes de biomarcadores pode suplementar ou substituir os métodos de diagnóstico utilizados baseados em entrevista. Apesar disso, agências regulatórias concordam agora que melhoras nos correntes métodos são essenciais. Além disso, essas agências estipularam que biomarcadores são importantes para o desenvolvimento de futuras drogas e iniciaram esforços no sentido de modernizar métodos e técnicas para suportar esses esforços. Aqui revisamos os desafios encontrados por essa tentativa do ponto de vista de psiquiatras, praticantes em geral, agências reguladoras e cientistas de biomarcadores. Também descrevemos o desenvolvimento de um novo teste sanguíneo molecular para esquizofrenia como um primeiro passo a esse objetivo.

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Holographic sensors for the detection of bacterial spores

Cited by 28 publications

References 27 publications

Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications

Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications

Progress in zeolite synthesis promotes advanced applications

Testes sanguíneos de biomarcadores para diagnóstico e tratamento de desordens mentais: foco em esquizofrenia

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