Now showing items 1-20 of 33

  • Angular dependent light emission from planar waveguides. 

    Peter, Jaison; Prabhu, Radhakrishna; Radhakrishnan, P.; Vallabhan, C. P. G.; Nampoori, V. P. N.; Kailasnath, M. (American Institute of Physics http://dx.doi.org/10.1063/1.4905011, 2015)
    PETER, J., PRABHU, R., RADHAKRISHNAN, P., VALLABHAN, C. P. G., NAMPOORI, V. P. N. and KAILASNATH, M., 2015. Angular dependent light emission from planar waveguides. Journal of Applied Physics, 117 (1), 015301.
    We have investigated the angular dependence of amplified spontaneous emission (ASE) and laser emission from an asymmetric and free-standing polymer thin films doped with rhodamine 6G, which is transversely pumped by a ...
  • Banknote authentication using chaotic elements technology. 

    Ambadiyil, Sajan; Krishnendu, P. S.; Pillai, V. P. Mahadevan; Prabhu, Radhakrishna (SPIE https://doi.org/10.1117/12.2278343, 2017-10-05)
    AMBADIYIL, S., KRISHNENDU, P.S., PILLAI, V.P.M. and PRABHU, R. 2017. Banknote authentication using chaotic elements technology. In Proceedings of the SPIE security and defence conference 2017, 10441: counterterrorism, crime fighting, forensics and surveillance, 11-14 September 2017, Warsaw, Poland. Bellingham, WA: SPIE [online], paper 1044104. Available from: https://doi.org/10.1117/12.2278343
    The counterfeit banknote is a growing threat to the society since the advancements in the field of computers, scanners and photocopiers, as they have made the duplication process for banknote much simpler. The fake note ...
  • Computational study of nanostructured composite materials for photonic crystal fibre sensors. 

    Johny, Jincy; Prabhu, Radhakrishna; Fung, Wai-Keung (IOP https://doi.org/10.1088/1757-899X/195/1/012012, 2017-05-11)
    JOHNY, J., PRABHU, R. and FUNG, W.-K. 2016. Computational study of nanostructured composite materials for photonic crystal fibre sensors. IOP conference series: materials science and engineering [online], 195: proceedings of the 3rd structural nano composites conference (NANOSTRUC 2016), 12-15 September 2016, Aberdeen, UK, article ID 012012. Available from: https://doi.org/10.1088/1757-899X/195/1/012012
    Photonic Crystal Fibres (PCFs) developed using nanostructured composite materials provides special optical properties which can revolutionise current optical sensing technologies. The modal and propagation characteristics ...
  • Controlled periodic illumination in semiconductor photocatalysis. 

    Tokode, Oluwatosin; Prabhu, Radhakrishna; Lawton, Linda A.; Robertson, Peter K. J. (Elsevier http://dx.doi.org/10.1016/j.jphotochem.2015.12.002, 2015-12-12)
    TOKODE, O., PRABHU, R., LAWTON, L.A. and ROBERTSON, P.K.J. 2015. Controlled periodic illumination in semiconductor photocatalysis. Journal of photochemistry and photobiology A: chemistry [online], 319-320, pages 96-106. Available from: http://dx.doi.org/10.1016/j.jphotochem.2015.12.002
    Controlled periodic illumination is a hypothesis postulated in the early 1990s for enhancing the efficiency of semiconductor photocatalytic reactions. This technique has been proposed to improve photocatalytic efficiency ...
  • Design optimization of Cassegrain telescope for remote explosive trace detection. 

    Bhavsar, Kaushalkumar; Eseller, K. E.; Prabhu, Radhakrishna (SPIE https://doi.org/10.1117/12.2277932, 2017-10-05)
    BHAVSAR, K., ESELLER, K.E. and PRABHU, R. 2017. Design optimization of Cassegrain telescope for remote explosive trace detection. In Proceedings of the SPIE security and defence conference 2017, 10441: counterterrorism, crime fighting, forensics and surveillance, 11-14 September 2017, Warsaw, Poland. Bellingham, WA: SPIE [online], paper 1044103. Available from: https://doi.org/10.1117/12.2277932
    The past three years have seen a global increase in explosive-based terror attacks. The widespread use of improvised explosives and anti-personnel landmines have caused thousands of civilian casualties across the world. ...
  • Development of dithizone based fibre optic evanescent wave sensor for heavy metal ion detection in aqueous environments. 

    Bhavsar, Kaushalkumar; Prabhu, Radhakrishna; Pollard, Pat (IOP Publishing. http://dx.doi.org/10.1088/1742-6596/450/1/012011, 2013-09)
    BHAVSAR, K., PRABHU, R. and POLLARD, P., 2013. Development of dithizone based fibre optic evanescent wave sensor for heavy metal ion detection in aqueous environments. Journal of Physics: Conference Series, 450, 012011.
    Detection of highly toxic heavy metal ions requires rapid, simple, sensitive and selective detection methods in the environment. Optical fibre based sensing facilitates the remote, continuous and in-situ detection ...
  • The effect of pH on the photonic efficiency of the destruction of methyl orange under controlled periodic illumination with UV-LED sources. 

    Tokode, Oluwatosin; Prabhu, Radhakrishna; Lawton, Linda A.; Robertson, Peter K. J. (Elsevier http://dx.doi.org/10.1016/j.cej.2014.03.002, 2014-03-12)
    TOKODE, O., PRABHU, R., LAWTON, L.A. and ROBERTSON, P.K.J. 2014. The effect of pH on the photonic efficiency of the destruction of methyl orange under controlled periodic illumination with UV-LED sources. Chemical engineering journal [online], 246, pages 337-342. Available from: http://dx.doi.org/10.1016/j.cej.2014.03.002
    The nature of photon interaction and reaction pH can have significant impacts on semiconductor photocatalysis. This paper describes the effect of pH on the photonic efficiency of photocatalytic reactions in the aqueous ...
  • Electrochemical oxidation of acetyl salicylic acid and its voltammetric sensing in real samples at a sensitive edge plane pyrolytic graphite electrode modified with graphene. 

    Kruanetr, Senee; Pollard, Pat; Fernandez, Carlos; Prabhu, Radhakrishna (ESG http://www.electrochemsci.org/papers/vol9/91005699.pdf, 2014-07-16)
    KRUANETR, S., POLLARD, P., FERNANDEZ, C. and PRABHU, R. 2014. Electrochemical oxidation of acetyl salicylic acid and its voltammetric sensing in real samples at a sensitive edge plane pyrolytic graphite electrode modified with graphene. International journal of electrochemical science [online], 9(10), pages 5699-5711. Available from: http://www.electrochemsci.org/papers/vol9/91005699.pdf
    We present in this manuscript for the first time the electrochemical oxidation of acetyl salicylic acid and its voltammetric sensing in real samples at a sensitive edge plane pyrolitic graphite electrode (EPPGE) modified ...
  • Extending the capability of forensic electrochemistry to the novel psychoactive substance benzylpiperazine. 

    Waddell, Stuart; Fernandez, Carlos; Inverarity, Catherine C.; Prabhu, Radhakrishna (Elsevier https://doi.org/10.1016/j.sbsr.2016.12.001, 2016-12-21)
    WADDELL, S.A., FERNANDEZ, C., INVERARITY, C.C. and PRABHU, R. 2017. Extending the capability of forensic electrochemistry to the novel psychoactive substance benzylpiperazine. Sensing and bio-sensing research [online], 13, pages 28-39. Available from: https://doi.org/10.1016/j.sbsr.2016.12.001.
    Benzylpiperazine (BZP) is a novel psychoactive substance that is commonly abused in tablet form as an 'ecstasy-type' drug. Electroanalysis offers genuine potential for field testing of bulk drug samples. This research is ...
  • Highly textured and transparent RF sputtered Eu2O3 doped ZnO films. 

    Sreedharan, Remadevi Sreeja; Ganesan, Vedachalaiyer; Sudarsanakumar, Chellappan Pillai; Bhavsar, Kaushalkumar; Prabhu, Radhakrishna; Pillai, V. P. Mahadevan (Co-Action Publishing. http://dx.doi.org/10.3402/nano.v6.26759, 2015-03)
    SREEDHARAN, R. S., GANESAN, V., SUDARSANAKUMAR, C. P., BHAVSAR, K., PRAHBU, R. and PILLAI, V. P. P. M., 2015. Highly textured and transparent RF sputtered Eu2O3 doped ZnO films. Nano Reviews. [online] Volume 6 Article 26759. (Available from: http://dx.doi.org/10.3402/nano.v6.26759) [Accessed 16 March 2015]
    Background: Zinc oxide (ZnO) is a wide, direct band gap II-VI oxide semiconductor. ZnO has large exciton binding energy at room temperature, and it is a good host material for obtaining visible and infrared emission of ...
  • Highly transparent and luminescent nanostructured Eu203 doped ZnO films. 

    Sreedharan, Remadevi Sreeja; Ganasan, Vedachalaiyer; Sudarsanakumar, Chellappan Pillai; Prabhu, Radhakrishna; Pillai, V. P. Mahadevan (IOP Publishing. http://dx.doi.org/10.1088/1757-899X/64/1/012027, 2014-05)
    SREEDHARAN, R. S., GANASAN, V., SUDARSANAKUMAR, C., PRABHU, R. and PILLAI, V. P. M., 2014. Highly transparent and luminescent nanostructured Eu203 doped ZnO films. IOP Conference Series: Materials Science and Engineering, 64, 012027.
    Zinc oxide is a wide, direct band gap II-VI oxide semiconductor. Pure and Eu-doped ZnO films are prepared by RF Magnetron sputtering at different doping concentrations (0.5, 1, 3 and 5 wt %). The films are annealed at 500 ...
  • Holographic interfermetry for security and forensic applications. 

    Ambadiyil, Sajan; Sreelekshmi, R. C.; Pillai, V. P. Mahadevan; Prabhu, Radhakrishna (SPIE https://doi.org/10.1117/12.2242153, 2016-09-26)
    AMBADIYIL, S., SREELEKSHMI, R.C., PILLAI, V.P.M. and PRABHU, R. 2016. Holographic interfermetry for security and forensic applications. In Proceedings of the 12th SPIE optics and counterterrorism, crime fighting and defence conference, 9995, 26-27 September 2016, Edinburgh, UK. Cardiff: SPIE [online], paper 9995-1. Available from: https://doi.org/10.1117/12.2242153
    Security holograms having unique 3D images are one of the tools for enhancing the security for product and personnel authentication and anti-counterfeiting. Apart from the high technology that is required, the uniqueness ...
  • Influence of Pr doping on the structural, morphological, optical, luminescent and non-linear optical properties of RF-sputtered ZnO films. 

    Sreedharan, Remadevi Sreeja; Vinodkumar, R.; Navas, I.; Prabhu, Radhakrishna; Pillai, V. P. Mahadevan (Springer http://dx.doi.org/10.1007/s11837-015-1632-0, 2015-09-23)
    SREEDHARAN, R.S., VINODKUMAR, R., NAVAS, I., PRABHU, R. and PILLAI, V.P.M. 2015. Influence of Pr doping on the structural, morphological, optical, luminescent and non-linear optical properties of RF-sputtered ZnO films. JOM: the journal of the minerals, metals and materials society [online], 68(1), pages 341-350. Available from: http://dx.doi.org/10.1007/s11837-015-1632-0
    The effects of Pr doping on the structural, morphological, optical and non-linear optical properties have been investigated. X-ray diffraction and Raman analysis reveals the formation of highly c-axis-oriented films with ...
  • Investigation of novel methods to remove the cyanotoxin, Cylindrospermopsin, from drinking water. 

    Chandu, Vijith Cholakkal Parambil (Robert Gordon University School of Pharmacy and Life Sciences, 2013-04)
    The widespread distribution of cyanobacteria and their toxic effects on humans has become a major concern for researchers. Cyanobacteria are a group of oxygenic phototrophic bacteria that exhibit an enormous diversity ...
  • Investigation of positioning of FBG sensors for smart monitoring of oil and gas subsea structures. 

    Johny, Jincy; Prabhu, Radhakrishna; Fung, Wai-Keung; Watson, John (IEEE https://dx.doi.org/10.1109/OCEANSAP.2016.7485662, 2016-04-10)
    JOHNY, J., PRABHU, R., FUNG, W. and WATSON, J. 2016. Investigation of positioning of FBG sensors for smart monitoring of oil and gas subsea structures. In the Proceedings of the MTS/IEEE OCEANS 2016 conference: our future is with oceans, 10-13 April 2016, Shanghai, China. Shanghai: MTS/IEEE [online], paper 151207-036. Available from: https://dx.doi.org/10.1109/OCEANSAP.2016.7485662
    Condition monitoring of offshore structures is an indispensable task in the oil and gas industry. Fibre Bragg Grating (FBG) is the key technology used down-hole in order to sense different physical parameters such as strain, ...
  • Investigation of structural parameter dependence of confinement losses in PCF–FBG sensor for oil and gas sensing applications. 

    Johny, Jincy; Prabhu, Radhakrishna; Fung, Wai-Keung (Springer https://dx.doi.org/10.1007/s11082-016-0528-8, 2016-03-25)
    JOHNY, J., PRABHU, R. and FUNG, W.-K. 2016. Investigation of structural parameter dependence of confinement losses in PCF–FBG sensor for oil and gas sensing applications. Optical and quantum electronics [online], 48(4), article 252. Available from: https://dx.doi.org/10.1007/s11082-016-0528-8
    Photonic crystal fibre (PCF)–fibre bragg grating (FBG) integration opens up new possibilities in multi-parameter fibre-optic sensing, owing to their active control over light characteristics and mode confinements. Their ...
  • Investigations on surface wettability of ZnO nanowires using UV LEDs for biosensing applications. 

    Bhavsar, Kaushalkumar; Prabhu, Radhakrishna; Pollard, Pat (IOP Publishing. http://dx.doi.org/10.1088/1757-899X/64/1/012033, 2014-05)
    BHAVSAR, K., PRABHU, R. and POLLARD, P., 2014. Investigations on surface wettability of ZnO nanowires using UV LEDs for biosensing applications. IOP Conference Series: Materials Science and Engineering, 64, 012033.
    ZnO is a biocompatible material suitable for biosensors and microfluidic devices. Nanowires of ZnO tend to show hydrophobic nature which decelerates the adhesion/adsorption of biomolecules on the surface. This paper ...
  • LED-controlled tuning of ZnO nanowires’ wettability for biosensing applications. 

    Bhavsar, Kaushalkumar; Ross, Duncan; Prabhu, Radhakrishna; Pollard, Pat (Co-Action Publishing. http://dx.doi.org/10.3402/nano.v6.26711, 2015-04)
    BHAVSAR, K., ROSS, D., PRABHU, R. and POLLARD, P., 2014. LED-controlled tuning of ZnO nanowires’ wettability for biosensing applications. Nano Reviews, 6:26711
    Background: Wettability is an important property of solid materials which can be controlled by surface energy. Dynamic control over the surface wettability is of great importance for biosensing applications. Zinc oxide ...
  • Mathematical modelling of quantum yield enhancements of methyl orange photooxidation in aqueous TiO2 suspensions under controlled periodic UV LED illumination. 

    Tokode, Oluwatosin; Prabhu, Radhakrishna; Lawton, Linda A.; Robertson, Peter K. J. (Elsevier http://dx.doi.org/10.1016/j.apcatb.2014.03.046, 2014-03-30)
    TOKODE, O., PRABHU, R., LAWTON, L.A. and ROBERTSON, P.K.J. 2014. Mathematical modelling of quantum yield enhancements of methyl orange photooxidation in aqueous TiO2 suspensions under controlled periodic UV LED illumination. Applied catalysis B: environmental [online], 156-157, pages 398-403. Available from: http://dx.doi.org/10.1016/j.apcatb.2014.03.046
    Quantum yields of the photocatalytic degradation of methyl orange under controlled periodic illumination (CPI) have been modelled using existing models. A modified Langmuir-Hinshelwood (L-H) rate equation was used to predict ...
  • Microstructure encryption and decryption techniques in optical variable and invariable devices in printed documents for security and forensic applications. 

    Ambadiyil, Sajan; Jayan, K. G.; Prabhu, Radhakrishna; Pillai, V. P. Mahadevan (SPIE https://doi.org/10.1117/12.2179635, 2015-05-05)
    AMBADIYIL, S., JAYAN, K.G., PRABHU, R. and PILLAI, V.P.M. 2015. Microstructure encryption and decryption techniques in optical variable and invariable devices in printed documents for security and forensic applications. In Baldini, F., Homala, J. and Lieberman, R.A. (eds.) Proceedings of the SPIE optical sensors 2015 conference, 9506, 13-16 April 2016, Prague, Czech Republic. Bellingham, WA: SPIE [online]. Available from: https://doi.org/10.1117/12.2179635
    Today, document counterfeiting is a global menace because of the advanced technologies available at ever decreasing prices. Instead of eschew the paper documents; applying efficient cost effective security methodologies ...