Dr. Aschalew Kassu Profile

Dr. Aschalew Kassu

Associate Professor at Alabama A&M Univ

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Author

Publications (31)

Proceedings Article | 20 August 2020 Presentation + Paper

Raman spectroscopic analysis of model solid rocket propellant for the detection of stabilizer decay

Carlton Farley, Aschalew Kassu, Jonathan Mills, Paul Ruffin, Michael Curley, Sandra Sadate-Moualeu, James Parker, Christopher Marshall, Jeremy Rice, Brian McDonald, Anup Sharma

Proceedings Volume 11498, 114980A (2020) https://doi.org/10.1117/12.2568206

KEYWORDS: Raman spectroscopy, Calibration, Rockets, Missiles, Liquids, Solids, Spectroscopy, Silicon, Laser systems engineering

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Proceedings Article | 20 August 2020 Presentation + Paper

Spectroscopic analysis of the degradation of solid propellant stabilizer

Carlton Farley, Jonathan Mills, Paul Ruffin, Aschalew Kassu, Sandra Sadate-Moualeu, Michael Curley, James Parker, Christopher Marshall, Jeremy Rice, Brian McDonald, Anup Sharma

Proceedings Volume 11498, 114980L (2020) https://doi.org/10.1117/12.2581859

KEYWORDS: Raman spectroscopy, Missiles, Luminescence, Solids, Spectroscopy, Nondestructive evaluation, Statistical analysis, Spectral resolution, Rockets

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Proceedings Article | 9 September 2019 Presentation

Dual wavelength Raman spectroscopic analysis of solid rocket propellant for the detection of stabilizer decay (Conference Presentation)

Carlton Farley, Paul Ruffin, Jonathan Mills, Sandra Sadate-Moualeu, Michael Curley, James Parker, Aschalew Kassu, Christopher Marshall, Jeremy Rice, Brian McDonald, Anup Sharma

Proceedings Volume 11123, 111230L (2019) https://doi.org/10.1117/12.2530025

KEYWORDS: Raman spectroscopy, Spectroscopy, Solids, Rockets, Luminescence, Chemical analysis, Statistical analysis, Fluorescence spectroscopy

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Proceedings Article | 19 September 2018 Paper

Optical characterization of polystyrene and ZnO

Padmaja Guggilla, Aschalew Kassu, David Simpson

Proceedings Volume 10730, 107301R (2018) https://doi.org/10.1117/12.2504000

KEYWORDS: Zinc oxide, FT-IR spectroscopy, Optical properties, Polymers, Dielectrics, Absorption, Raman spectroscopy, Refractive index, Light emitting diodes, Composites

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Proceedings Article | 17 September 2018 Presentation + Paper

Broadband optical sensing/detection technology for missile systems

Carlton Farley III, Aschalew Kassu, Sandra Sadate-Moualeu, Jonathan Mills, Christina Brantley, Eugene Edwards, Paul Ruffin, Anup Sharma

Proceedings Volume 10746, 1074608 (2018) https://doi.org/10.1117/12.2321257

KEYWORDS: Lamps, Light sources, Halogens, Light emitting diodes, Missiles, Metals, Spectroscopy, Light, Aluminum, Near infrared

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Proceedings Article | 14 September 2018 Open Access

Impact of undergraduate research participation in characterization of materials

Aschalew Kassu, Carlton Farley III, Jonathan Mills, Anup Sharma, Paul Ruffin

Proceedings Volume 10741, 1074106 (2018) https://doi.org/10.1117/12.2320310

KEYWORDS: Physics, Internships, Raman spectroscopy, Optics education, Education and training, Engineering education

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Proceedings Article | 14 September 2018 Paper

Multifunctional organic flexible nanocomposite sensors for biomedical applications

Ashok Batra, Bir Bohara, Ravindra Lal, James Currie, Kunal Grover, Aschalew Kassu, Manmohan Aggarwal

Proceedings Volume 10738, 107381G (2018) https://doi.org/10.1117/12.2320141

KEYWORDS: Sensors, Dielectrics, Nanocomposites, Composites, Resistance, Temperature metrology, Biomedical optics, Energy harvesting, Ferroelectric polymers, Nanoparticles

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Proceedings Article | 4 September 2018 Paper

Raman detection of MNA in solid rocket fuels

Carlton Farley, Aschalew Kassu, Jonathan Mills, Sandra Sadate-Moualeu, Michael Curley, Paul Ruffin, Anup Sharma, Jeremy Rice, Christopher Marshall

Proceedings Volume 10755, 107550U (2018) https://doi.org/10.1117/12.2321356

KEYWORDS: Raman spectroscopy, Rockets, Missiles, Solids, Nondestructive evaluation, Chemical analysis, Sensors

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Proceedings Article | 23 August 2017 Paper

Raman monitoring and evaluation of the aging effects of rocket propellant stabilizers

Jonathan Mills, Carlton Farley, Aschalew Kassu, Michael Curley, Anup Sharma, Paul Ruffin, Christopher Marshall, Jeremy Rice, Brian McDonald

Proceedings Volume 10382, 1038210 (2017) https://doi.org/10.1117/12.2274931

KEYWORDS: Rockets, Raman spectroscopy, Photonic crystal fibers, Nitrous oxide, Nondestructive evaluation, Crystals, Photonic crystals, Photonic devices

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Proceedings Article | 19 April 2017 Paper

Nondestructive spectroscopic characterization of building materials

Aschalew Kassu, Lauren Walker, Rachel Sanders, Carlton Farley, Jonathan Mills, Anup Sharma

Proceedings Volume 10169, 101692V (2017) https://doi.org/10.1117/12.2261886

KEYWORDS: Latex, Absorption, Composites, Civil engineering, Raman scattering, Forensic science, Raman spectroscopy, Buildings, Spectroscopy, Silicon, Nondestructive evaluation, Sensors, Intelligent sensors, Intelligent sensor systems

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Proceedings Article | 26 September 2016 Paper

Raman detection of extra virgin olive oil adulterated with cheaper oils

Carlton Farley, Aschalew Kassu, Jonathan Mills, Brianna Kenney, Paul Ruffin, Anup Sharma

Proceedings Volume 9933, 99330K (2016) https://doi.org/10.1117/12.2238369

KEYWORDS: Raman spectroscopy, Glasses, Vegetable oil, Spectroscopy, Agriculture, FT-IR spectroscopy, Chemistry, Chemical analysis, Near infrared spectroscopy, Infrared spectroscopy

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Proceedings Article | 15 September 2016 Paper

Raman spectral analysis of high efficiency PVDF: nanocomposite films doped with MWCNT

Padmaja Guggilla, Aschalew Kassu, Rachel Powell

Proceedings Volume 9927, 99271R (2016) https://doi.org/10.1117/12.2240030

KEYWORDS: Ferroelectric polymers, Nanocomposites, Raman spectroscopy, Composites, Sensors, Ferroelectric materials, Dielectrics, Temperature metrology, Dielectric polarization, Pyroelectric detectors

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Nanocomposite films are of great interest in the development of infrared detectors and other technology. Polyvinylidenefluoride (PVDF) with excellent pyroelectric and piezoelectric properties such as fast, dynamic response has great potential for use in touch/tactile sensors, infrared detectors and thermal vidicon/imaging devices. PVDF:LiNbO₃, PVDF:LiTaO₃, and PVDF:BaTiO₃ nanocomposites are fabricated with optimal characteristics using the solution casting technique. All these nanocomposite films are doped with multi-walled carbon nanotubes (MWCNT) with various weight percentages. The objective of this research was to characterize the low-frequency dielectric constant, dielectric loss and the pyroelectric properties of these composite films and thus the materials figures of merit for their use in space applications. Nanocomposites are also characterized using Raman Spectroscopy to get the finger print of these materials and their existence in the composite film. Dielectric constant and dielectric loss results are presented as a function of temperature and frequency, and pyroelectric coefficient as a function of temperature. Raman Spectrum of the nanocomposite materials is presented using 785nm laser. Obtained Raman spectrum matches with the literature available. Authors also observed that both microscopic structure and environmental conditions contributed to observed properties. Dielectric loss resulted from electromagnetic energy loss as manifested through phase differences between low-frequency input signal to the films and time varying polarization. In addition, both the dielectric constant and dielectric loss were observed to be highest for MWCNT doped nanocomposite materials compared to pure PVDF and pure PVDF:LiNbO₃, PVDF:LiTaO₃, and PVDF:BaTiO₃. Among all the MWCNT doped nanocomposite materials PVDF:LiTaO₃ showed the highest Pyroelectric coefficient which would make the best material to be used in space applications compared to the other materials at test.

Proceedings Article | 7 September 2016 Presentation + Paper

Raman studies for stockpile reliability of missiles by detecting degradation of propellant stabilizers

Carlton Farley, Aschalew Kassu, Jonathan Mills, Jonathan Bibb, Michael Curley, Paul Ruffin, Anup Sharma, Jeremy Rice, Brian McDonald

Proceedings Volume 9958, 99580P (2016) https://doi.org/10.1117/12.2236331

KEYWORDS: Raman spectroscopy, Missiles, Rockets, Reliability, Sensors, Luminescence, Nitrous oxide, Humidity, Solids, Chemical analysis

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Proceedings Article | 12 September 2014 Paper

Stand-off and up-close Raman detection of nitrates buried in sand and soils

Carlton Farley, Sandra Sadate, Aschalew Kassu, Belther Monono, William Witt, Jonathan Bibb, Anup Sharma

Proceedings Volume 9219, 92190J (2014) https://doi.org/10.1117/12.2062184

KEYWORDS: Raman spectroscopy, Sodium, Glasses, Explosives, Telescopes, Signal to noise ratio, Soil science, Standoff detection, Raman scattering, Silicon

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Proceedings Article | 5 September 2014 Paper

Transmission of UV/visible light through model human epidermis at varying ambient humidity

Carlton Farley, Sandra Sadate, Aschalew Kassu, Anup Sharma

Proceedings Volume 9205, 92050W (2014) https://doi.org/10.1117/12.2062154

KEYWORDS: Humidity, Light scattering, Water, Skin, Lamps, Glasses, Mathematical modeling, Ultraviolet radiation, Scattering, Light emitting diodes

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Proceedings Article | 22 May 2014 Paper

Effect of film thickness on localized surface plasmon enhanced chemical sensor

Aschalew Kassu, Carlton Farley, Anup Sharma, Wonkyu Kim, Junpeng Guo

Proceedings Volume 9106, 910605 (2014) https://doi.org/10.1117/12.2050178

KEYWORDS: Gold, Raman scattering, Surface plasmons, Raman spectroscopy, Absorbance, Nanostructuring, Atomic force microscopy, Reflectivity, Resonance enhancement, Chemical fiber sensors

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Proceedings Article | 22 May 2014 Paper

Optical characterization of nanoporous AAO sensor substrate

Aschalew Kassu, Carlton Farley, Anup Sharma

Proceedings Volume 9106, 91060M (2014) https://doi.org/10.1117/12.2053440

KEYWORDS: Transmittance, Reflectivity, Absorbance, Reflection, Optical properties, Biological and chemical sensing, Atomic force microscopy, Optical sensing, Absorption, Sensors

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SPIE Journal Paper | 25 April 2013

Surface-enhanced Raman spectroscopy scattering from gold-coated ceramic nanopore substrates: effect of nanopore size

Paul Robinson, Aschalew Kassu, Anup Sharma, Tatiana Kukhtareva, Carlton Farley, Cydale Smith, Paul Ruffin, Christina Brantley, Eugene Edwards

JNP, Vol. 7, Issue 01, 073592, (April 2013) https://doi.org/10.1117/12.10.1117/1.JNP.7.073592

KEYWORDS: Surface enhanced Raman spectroscopy, Gold, Raman spectroscopy, Plasmons, Raman scattering, Ceramics, Scattering, Molecules, Absorption, Metals

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Proceedings Article | 17 October 2012 Paper

Gold-coated nanoporous substrates for SERS studies

P. Robinson, A. Kassu, A. Sharma, T. Kukhtareva, P. Ruffin, C. Brantley, E. Edwards

Proceedings Volume 8465, 84650P (2012) https://doi.org/10.1117/12.928788

KEYWORDS: Surface enhanced Raman spectroscopy, Gold, Raman spectroscopy, Molecules, Raman scattering, Metals, Laser scattering, Scattering, Molecular lasers, Silver

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Proceedings Article | 16 September 2011 Paper

Photodegradation of melanin thin films by UV lithography

C. Farley, A. Kassu, A. Sharma

Proceedings Volume 8103, 81030F (2011) https://doi.org/10.1117/12.892837

KEYWORDS: Humidity, Thin films, Ultraviolet radiation, Mathematical modeling, Adsorption, Glasses, Data modeling, Interferometry, Lithography, Absorption

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Proceedings Article | 16 September 2011 Paper

Standoff Raman measurement of nitrates in water

S. Sadate, A. Kassu, C. W. Farley, A. Sharma, J. Hardisty, Miles T. K. Lifson

Proceedings Volume 8156, 81560D (2011) https://doi.org/10.1117/12.893571

KEYWORDS: Raman spectroscopy, Sodium, Water, Explosives, Chemical analysis, Telescopes, Spectroscopy, Environmental monitoring, Atmospheric monitoring, Minerals

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SPIE Journal Paper | 1 October 2010

Recycling of surface-enhanced Raman substrates by ultraviolet cleaning

Sandra Sadate, Fernando Calzzani, Aschalew Kassu, Anup Sharma, Paul Ruffin, Christina Brantley, Eugene Edwards

OE, Vol. 49, Issue 10, 106501, (October 2010) https://doi.org/10.1117/12.10.1117/1.3491201

KEYWORDS: Surface enhanced Raman spectroscopy, Ultraviolet radiation, Raman spectroscopy, Lithography, Signal to noise ratio, Mercury, Ultrasonics, Optical engineering, Lamps, Rhodamine

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Proceedings Article | 28 August 2010 Paper

Gold/silver coated nanoporous ceramic membranes: a new substrate for SERS studies

A. Kassu, P. Robinson, A. Sharma, P. Ruffin, C. Brantley, E. Edwards

Proceedings Volume 7764, 77640M (2010) https://doi.org/10.1117/12.859886

KEYWORDS: Surface enhanced Raman spectroscopy, Gold, Ceramics, Silicon, Sputter deposition, Molecules, Lithography, Raman spectroscopy, Silver, Nanorods

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Proceedings Article | 28 August 2010 Paper

Reusing commercial SERS substrate by gold/silver coating

A. Kassu, P. Robinson, A. Sharma, P. Ruffin, C. Brantley, E. Edwards

Proceedings Volume 7764, 77640Q (2010) https://doi.org/10.1117/12.859897

KEYWORDS: Surface enhanced Raman spectroscopy, Gold, Coating, Silver, Raman spectroscopy, Sputter deposition, Silicon, Metals, Nanolithography, Resonance enhancement

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Proceedings Article | 9 September 2008 Paper

UV lithographic patterning on spin-coated DNA thin-films

Darnell Diggs, James Grote, Carrie Bartsch, Fahima Ouchen, Anup Sharma, J. M. Taguenang, Aschalew Kassu, Redahegn Sileshi

Proceedings Volume 7040, 70400E (2008) https://doi.org/10.1117/12.802222

KEYWORDS: Ultraviolet radiation, Lithography, Photomasks, Proteins, Thin films, Optical lithography, Opacity, Interferometry, Polymers, Diffraction gratings

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Proceedings Article | 28 August 2008 Paper

Photochemical nano-scale patterning with Rhodamine 6G dye from aqueous phase

Aschalew Kassu, Fernando Calzzani, Jean Taguenang, Redahegn Sileshi, Anup Sharma

Proceedings Volume 7033, 703306 (2008) https://doi.org/10.1117/12.794967

KEYWORDS: Rhodamine, Holography, Optical lithography, Lithography, Absorption, Photomasks, Molecules, Dye lasers, Interferometry, Thin films

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Proceedings Article | 28 August 2008 Paper

Patterning and characterization of model phospholipid membranes

Aschalew Kassu, Fernando Calzzani, Jean M. Taguenang, Redahegn Sileshi, Anup Sharma

Proceedings Volume 7035, 703508 (2008) https://doi.org/10.1117/12.794377

KEYWORDS: Optical lithography, Lithography, Photomasks, Molecules, Proteins, Interferometry, Photomicroscopy, Holography, Absorption, Polymers

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Proceedings Article | 15 April 2008 Paper

Detection of residual traces of explosives by surface enhanced Raman scattering using gold coated substrates produced by nanospheres imprint technique

F. Calzzani, R. Sileshi, A Kassu, J. M. Taguenang, A. Chowdhury, A. Sharma, P. Ruffin, C. Brantley, E. Edwards

Proceedings Volume 6945, 69451O (2008) https://doi.org/10.1117/12.777072

KEYWORDS: Surface enhanced Raman spectroscopy, Explosives, Raman spectroscopy, Gold, Nanoparticles, Chemical analysis, Raman scattering, Glasses, Particles, Explosives detection

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Proceedings Article | 22 September 2007 Paper

Surface enhanced Raman spectroscopy on the tip of a plastic optical fiber

J. Taguenang, A. Kassu, A. Sharma, D. Diggs

Proceedings Volume 6641, 66411X (2007) https://doi.org/10.1117/12.731246

KEYWORDS: Surface enhanced Raman spectroscopy, Gold, Polymethylmethacrylate, Raman spectroscopy, Nanoparticles, Molecules, Silicon, Rhodamine, Polymer optical fibers, Chemical analysis

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Proceedings Article | 11 September 2007 Paper

Nano-scale patterning of phospholipid thin films by interferometric UV lithography

Aschalew Kassu, Jean-Michel Taguenang, Anup Sharma

Proceedings Volume 6645, 664509 (2007) https://doi.org/10.1117/12.731248

KEYWORDS: Ultraviolet radiation, Thin films, Interferometry, Lithography, Humidity, Diffraction gratings, Optical lithography, Polymers, Mirrors, Holography

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Proceedings Article | 7 September 2006 Paper

Chemical sensing through multiple light taps in plastic optical fiber

J. Taguenang, A. Kassu, A. Sharma, P. Ruffin, C. Brantley, E. Edwards

Proceedings Volume 6296, 62961F (2006) https://doi.org/10.1117/12.679105

KEYWORDS: Luminescence, Biological and chemical sensing, Polymer optical fibers, Environmental sensing, Chemical fiber sensors, Fiber lasers, Laser induced fluorescence, Chemical analysis, Endoscopy, Industrial chemicals

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Showing 5 of 31 publications

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