Nonlinear optical properties of natural laccaic acid dye studied using Z-scan technique
- Zongo, S, Sanusi, Kayode, Britton, Jonathan, Mthunzi, P, Nyokong, Tebello, Maaza, M, Sahraoui, B
- Authors: Zongo, S , Sanusi, Kayode , Britton, Jonathan , Mthunzi, P , Nyokong, Tebello , Maaza, M , Sahraoui, B
- Date: 2015
- Language: English
- Type: Article
- Identifier: vital:7261 , http://hdl.handle.net/10962/d1020270
- Description: We have investigated the nonlinear optical properties, including the optical limiting behaviour for five different concentrations of laccaic acid dye in solution and a thin film obtained through doping in poly (methyl methacrylate) (PMMA) polymer. The experiments were performed by using single beam Z-scan technique at 532 nm with 10 ns, 10 Hz Nd:YAG laser pulses excitation. From the open-aperture Z-scan data, we derived that the laccaic dye samples exhibit strong two photon absorption (2PA). The nonlinear refractive index was determined through the closed aperture Z-scan data. The estimated absorption coefficient β2, nonlinear refractive index n2 and second order hyperpolarizability γ were found to be of the order of 10−10 m/W, 10−9 esu and 10−32 esu, respectively. The Z-scan study reveals that the natural laccaic acid dye emerges as a promising material for third order nonlinear optical devices application. , Original publication is available at http://dx.doi.org/10.1016/j.optmat.2015.04.031
- Full Text: false
- Authors: Zongo, S , Sanusi, Kayode , Britton, Jonathan , Mthunzi, P , Nyokong, Tebello , Maaza, M , Sahraoui, B
- Date: 2015
- Language: English
- Type: Article
- Identifier: vital:7261 , http://hdl.handle.net/10962/d1020270
- Description: We have investigated the nonlinear optical properties, including the optical limiting behaviour for five different concentrations of laccaic acid dye in solution and a thin film obtained through doping in poly (methyl methacrylate) (PMMA) polymer. The experiments were performed by using single beam Z-scan technique at 532 nm with 10 ns, 10 Hz Nd:YAG laser pulses excitation. From the open-aperture Z-scan data, we derived that the laccaic dye samples exhibit strong two photon absorption (2PA). The nonlinear refractive index was determined through the closed aperture Z-scan data. The estimated absorption coefficient β2, nonlinear refractive index n2 and second order hyperpolarizability γ were found to be of the order of 10−10 m/W, 10−9 esu and 10−32 esu, respectively. The Z-scan study reveals that the natural laccaic acid dye emerges as a promising material for third order nonlinear optical devices application. , Original publication is available at http://dx.doi.org/10.1016/j.optmat.2015.04.031
- Full Text: false
Rhodes University graduation ceremonies address - 7-9 April 2011
- Authors: Badat, Saleem
- Date: 2014-04-07
- Language: English
- Type: Text
- Identifier: vital:7842 , http://hdl.handle.net/10962/d1016035
- Full Text:
- Authors: Badat, Saleem
- Date: 2014-04-07
- Language: English
- Type: Text
- Identifier: vital:7842 , http://hdl.handle.net/10962/d1016035
- Full Text:
Rhodes fundraiser input
- Authors: Badat, Saleem
- Date: 2013-11-07
- Language: English
- Type: Text
- Identifier: vital:7928 , http://hdl.handle.net/10962/d1016478
- Full Text:
- Authors: Badat, Saleem
- Date: 2013-11-07
- Language: English
- Type: Text
- Identifier: vital:7928 , http://hdl.handle.net/10962/d1016478
- Full Text:
How to spread it: Saleem Badat
- Authors: Badat, Saleem
- Date: 2013-08-04
- Language: English
- Type: Text
- Identifier: vital:7903 , http://hdl.handle.net/10962/d1016453
- Full Text:
- Authors: Badat, Saleem
- Date: 2013-08-04
- Language: English
- Type: Text
- Identifier: vital:7903 , http://hdl.handle.net/10962/d1016453
- Full Text:
CHERTL panel on university rankings
- Authors: Badat, Saleem
- Date: 2013-07-15
- Language: English
- Type: Text
- Identifier: vital:7901 , http://hdl.handle.net/10962/d1016451
- Full Text:
- Authors: Badat, Saleem
- Date: 2013-07-15
- Language: English
- Type: Text
- Identifier: vital:7901 , http://hdl.handle.net/10962/d1016451
- Full Text:
Address of the Vice-Chancellor at the unveiling of the tapestry in the Rhodes University Council and Senate Chamber
- Authors: Badat, Saleem
- Date: 2011-12-01
- Language: English
- Type: Text
- Identifier: vital:7857 , http://hdl.handle.net/10962/d1016050
- Full Text:
- Authors: Badat, Saleem
- Date: 2011-12-01
- Language: English
- Type: Text
- Identifier: vital:7857 , http://hdl.handle.net/10962/d1016050
- Full Text:
Welcome and opening comments at the Rhodes University Colloquium on Postgraduate Supervision
- Authors: Badat, Saleem
- Date: 2011-11-21
- Language: English
- Type: Text
- Identifier: vital:7850 , http://hdl.handle.net/10962/d1016043
- Full Text:
- Authors: Badat, Saleem
- Date: 2011-11-21
- Language: English
- Type: Text
- Identifier: vital:7850 , http://hdl.handle.net/10962/d1016043
- Full Text:
Management 1 lecture
- Authors: Badat, Saleem
- Date: 2011-09-06
- Language: English
- Type: Text
- Identifier: vital:7814 , http://hdl.handle.net/10962/d1016007
- Full Text:
- Authors: Badat, Saleem
- Date: 2011-09-06
- Language: English
- Type: Text
- Identifier: vital:7814 , http://hdl.handle.net/10962/d1016007
- Full Text:
On university differentiation and diversity
- Authors: Badat, Saleem
- Date: 2011-06-30
- Language: English
- Type: Text
- Identifier: vital:7840 , http://hdl.handle.net/10962/d1016033
- Full Text:
- Authors: Badat, Saleem
- Date: 2011-06-30
- Language: English
- Type: Text
- Identifier: vital:7840 , http://hdl.handle.net/10962/d1016033
- Full Text:
Rhodes University Postgraduates orientation welcome
- Authors: Badat, Saleem
- Date: 2011-02-18
- Language: English
- Type: Text
- Identifier: vital:7849 , http://hdl.handle.net/10962/d1016042
- Full Text:
- Authors: Badat, Saleem
- Date: 2011-02-18
- Language: English
- Type: Text
- Identifier: vital:7849 , http://hdl.handle.net/10962/d1016042
- Full Text:
How healthy is our Constitutional Democracy?
- Authors: Badat, Saleem
- Date: 2009-09-22
- Language: English
- Type: Text
- Identifier: vital:7743 , http://hdl.handle.net/10962/d1015890
- Full Text:
- Authors: Badat, Saleem
- Date: 2009-09-22
- Language: English
- Type: Text
- Identifier: vital:7743 , http://hdl.handle.net/10962/d1015890
- Full Text:
Valuing the purposes of higher education
- Authors: Badat, Saleem
- Date: 2009-09-20
- Subjects: Higher Education
- Language: English
- Type: Text
- Identifier: vital:7732 , http://hdl.handle.net/10962/d1015879
- Full Text:
- Authors: Badat, Saleem
- Date: 2009-09-20
- Subjects: Higher Education
- Language: English
- Type: Text
- Identifier: vital:7732 , http://hdl.handle.net/10962/d1015879
- Full Text:
Address at the Farewell to Mr. David Wylde, Headmaster of St Andrews College, Grahamstown
- Authors: Badat, Saleem
- Date: 2008-10-18
- Subjects: Wylde, David
- Language: English
- Type: Text
- Identifier: vital:7664 , http://hdl.handle.net/10962/d1015809
- Full Text:
- Authors: Badat, Saleem
- Date: 2008-10-18
- Subjects: Wylde, David
- Language: English
- Type: Text
- Identifier: vital:7664 , http://hdl.handle.net/10962/d1015809
- Full Text:
Public acknowledgement of and apology for past shameful actions : circular issued by the Office of the Vice-Chancellor
- Authors: Badat, Saleem
- Date: 2008-09-16
- Subjects: Rhodes University
- Language: English
- Type: Text
- Identifier: vital:7680 , http://hdl.handle.net/10962/d1015825
- Full Text:
- Authors: Badat, Saleem
- Date: 2008-09-16
- Subjects: Rhodes University
- Language: English
- Type: Text
- Identifier: vital:7680 , http://hdl.handle.net/10962/d1015825
- Full Text:
Address to the convocation of Rhodes University
- Authors: Badat, Saleem
- Date: 2008-08-23
- Subjects: Rhodes University
- Language: English
- Type: Text
- Identifier: vital:7685 , http://hdl.handle.net/10962/d1015830
- Full Text:
- Authors: Badat, Saleem
- Date: 2008-08-23
- Subjects: Rhodes University
- Language: English
- Type: Text
- Identifier: vital:7685 , http://hdl.handle.net/10962/d1015830
- Full Text:
Address on receipt of an Honorary Doctorate from the University of York, United Kingdom
- Authors: Badat, Saleem
- Date: 2008-07-10
- Language: English
- Type: Text
- Identifier: vital:7701 , http://hdl.handle.net/10962/d1015846
- Full Text:
- Authors: Badat, Saleem
- Date: 2008-07-10
- Language: English
- Type: Text
- Identifier: vital:7701 , http://hdl.handle.net/10962/d1015846
- Full Text:
SANPAD : South Africa Netherlands Research Programme for Alternatives in Development
- Authors: Badat, Saleem
- Date: 2008-06-23
- Language: English
- Type: Text
- Identifier: vital:7710 , http://hdl.handle.net/10962/d1015855
- Full Text:
- Authors: Badat, Saleem
- Date: 2008-06-23
- Language: English
- Type: Text
- Identifier: vital:7710 , http://hdl.handle.net/10962/d1015855
- Full Text:
Exploring the political geoecology of African Drainage Basins
- Authors: Rowntree, Kate
- Date: 2008-04
- Language: English
- Type: Text
- Identifier: vital:580 , http://hdl.handle.net/10962/d1018873 , Transcript of Inaugural lecture August 2007
- Description: [From the text] Many people in Africa rely directly on their natural ecosystems for their livelihoods. A key driver of these ecosystems is water, which in Africa has a high spatial and temporal variability. Water comes from rainfall, but the availability of that water depends on the way that it is processed through the landscape unit known as a drainage basin. Drainage basins are the "home" of rivers; rivers which sustain ecosystems and their dependents (human society). Humans and ecosystems cannot live apart from one another, but the relationship can be exploitative and degrading, or harmonious and protective. Throughout history human activity has been subject to direct controls and indirect pressures subjected by the larger society, through political, economic and cultural forces that are often intertwined. Rivers are especially sensitive to the geography of this relationship. Being longitudinal ecosystems that transfer water and other materials from the source of the river to the oceans, activities in upstream areas have a direct impact on downstream areas. To explore these socio-ecological relationships within the context of an African drainage basin I have developed the concept of political geoecology that is explored in this address.
- Full Text:
- Authors: Rowntree, Kate
- Date: 2008-04
- Language: English
- Type: Text
- Identifier: vital:580 , http://hdl.handle.net/10962/d1018873 , Transcript of Inaugural lecture August 2007
- Description: [From the text] Many people in Africa rely directly on their natural ecosystems for their livelihoods. A key driver of these ecosystems is water, which in Africa has a high spatial and temporal variability. Water comes from rainfall, but the availability of that water depends on the way that it is processed through the landscape unit known as a drainage basin. Drainage basins are the "home" of rivers; rivers which sustain ecosystems and their dependents (human society). Humans and ecosystems cannot live apart from one another, but the relationship can be exploitative and degrading, or harmonious and protective. Throughout history human activity has been subject to direct controls and indirect pressures subjected by the larger society, through political, economic and cultural forces that are often intertwined. Rivers are especially sensitive to the geography of this relationship. Being longitudinal ecosystems that transfer water and other materials from the source of the river to the oceans, activities in upstream areas have a direct impact on downstream areas. To explore these socio-ecological relationships within the context of an African drainage basin I have developed the concept of political geoecology that is explored in this address.
- Full Text:
Perspectives on the skills shortage, the role of Higher Education Institutions to overcome this shortage and the possible role of JIPSA
- Authors: Badat, Saleem
- Date: 2008-03-26
- Subjects: Higher Education -- South Africa
- Language: English
- Type: Text
- Identifier: vital:7717 , http://hdl.handle.net/10962/d1015862
- Full Text:
- Authors: Badat, Saleem
- Date: 2008-03-26
- Subjects: Higher Education -- South Africa
- Language: English
- Type: Text
- Identifier: vital:7717 , http://hdl.handle.net/10962/d1015862
- Full Text:
Welcome address at the Department of Ichthyology and Fisheries State Vets Course, 2007
- Authors: Badat, Saleem
- Date: 2007-10-15 , 2014-06-13
- Language: English
- Type: Text
- Identifier: vital:7624 , http://hdl.handle.net/10962/d1011839
- Description: Welcome address at the Department of Ichthyology and Fisheries State Vets Course, 15 October 2007
- Full Text:
- Authors: Badat, Saleem
- Date: 2007-10-15 , 2014-06-13
- Language: English
- Type: Text
- Identifier: vital:7624 , http://hdl.handle.net/10962/d1011839
- Description: Welcome address at the Department of Ichthyology and Fisheries State Vets Course, 15 October 2007
- Full Text: