Dr. James R. Heflin Profile

Dr. James R. Heflin

Professor of Physics at Virginia Polytechnic Institute and State Univ

SPIE Involvement:

Author

Publications (26)

Proceedings Article | 28 September 2013 Paper

Self-assembled nanomaterials for nonlinear fiber optics and tunable plasmonics

Islam Ashry, Chalongrat Daengngam, Ishac Kandas, James Heflin, Hans Robinson, Yong Xu

Proceedings Volume 8845, 88450D (2013) https://doi.org/10.1117/12.2024380

KEYWORDS: Luminescence, Polymers, Plasmonics, Second-harmonic generation, Silica, Coating, Molecular self-assembly, Gold, Nonlinear optics, Molecules

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Proceedings Article | 9 April 2010 Paper

Transports of ionic liquids in ionic polymer conductor network composite actuators

Yang Liu, Sheng Liu, Junhong Lin, Dong Wang, Vaibhav Jain, Reza Montazami, James Heflin, Jing Li, Louis Madsen, Q. Zhang

Proceedings Volume 7642, 76421A (2010) https://doi.org/10.1117/12.847618

KEYWORDS: Ions, Composites, Electrodes, Actuators, Liquids, Polymers, Diffusion, Polymeric actuators, Electroactive polymers, Magnetism

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Proceedings Article | 6 April 2009 Paper

Investigating a few key issues of ionomeric polymer conductive network composite electromechanical transducers

Sheng Liu, Minren Lin, Yang Liu, Qiming Zhang, Reza Montazami, Vaibhav Jain, James Heflin

Proceedings Volume 7287, 72870T (2009) https://doi.org/10.1117/12.815855

KEYWORDS: Composites, Actuators, Electrodes, Resistance, Ions, Capacitors, Polymers, Capacitance, Polymeric actuators, Cesium

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SPIE Journal Paper | 1 January 2009

Fabrication of nonlinear optical devices in ionically self-assembled monolayers

Aruna Kroetch, Stephen Buswell, Stephane Evoy, Cemil Durak, James Heflin, Vladimir Kochergin, Roger Duncan

JM3, Vol. 8, Issue 01, 013011, (January 2009) https://doi.org/10.1117/12.10.1117/1.3066521

KEYWORDS: Silicon, Nanoimprint lithography, Chromophores, Second-harmonic generation, Self-assembled monolayers, Nonlinear optics, Reactive ion etching, Waveguides, Etching, Photonic crystals

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Proceedings Article | 21 September 2007 Paper

Robust antireflection coatings By UV cross-linking of silica nanoparticles and diazo-resin polycation

Jason Ridley, James Heflin, Alfred Ritter

Proceedings Volume 6674, 667406 (2007) https://doi.org/10.1117/12.734515

KEYWORDS: Nanoparticles, Silica, Antireflective coatings, Adhesives, Mass attenuation coefficient, Ultraviolet radiation, Multilayers, Refractive index, Composites, Particles

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Proceedings Article | 12 September 2007 Paper

Sensitivity control of optical fiber biosensors utilizing turnaround point long period gratings with self-assembled polymer coatings

Erika Gifford, Z. Wang, S. Ramachandran, J. Heflin

Proceedings Volume 6659, 66590D (2007) https://doi.org/10.1117/12.734392

KEYWORDS: Biosensors, Refractive index, Optical fibers, Signal attenuation, Cladding, Etching, Molecules, Silica, Nanoparticles, Thin films

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Proceedings Article | 4 October 2005 Paper

Modelling of external quantum efficiency spectra as a function of varying P3OT thickness in P3OT-C60 polymer photovoltaic devices

A. Gopal, M. Drees, R. Davis, J. Heflin

Proceedings Volume 5938, 593813 (2005) https://doi.org/10.1117/12.615987

KEYWORDS: External quantum efficiency, Polymers, Absorption, Photovoltaics, Fullerenes, Interfaces, Sulfur, Aluminum, Solids, Data modeling

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Proceedings Article | 13 September 2005 Paper

Sensitivity of long period fiber gratings to nanoscale ionic self-assembled multilayers

Zhiyong Wang, J. Heflin, Kevin Vancott, Rogers Stolen, Siddharth Ramachandran, Samir Ghalmi

Proceedings Volume 5925, 59250U (2005) https://doi.org/10.1117/12.616002

KEYWORDS: Refractive index, Thin films, Cladding, Multilayers, Optical fibers, Biosensors, Sensors, Annealing, Silica, Molecules

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Proceedings Article | 6 February 2004 Paper

Enhanced photovoltaic efficiency in polymer-fullerene composites by thermally controlled interdiffusion

Martin Drees, James Heflin, Richey Davis, Daniela Topasna, Paige Stevenson

Proceedings Volume 5215, (2004) https://doi.org/10.1117/12.506586

KEYWORDS: Polymers, Transmission electron microscopy, Fullerenes, External quantum efficiency, Absorption, Interfaces, Luminescence, Photovoltaics, Glasses, Organic photovoltaics

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Proceedings Article | 7 December 2001 Paper

In-situ second harmonic generation measurements of the formation of ionically self-assembled monolayers

Charles Brands, Patrick Neyman, M. Guzy, S. Shah, Rick Davis, Kevin Van Cott, Hong Wang, Harry Gibson, James Heflin

Proceedings Volume 4461, (2001) https://doi.org/10.1117/12.449844

KEYWORDS: Second-harmonic generation, Glasses, Harmonic generation, Self-assembled monolayers, Polymers, Adsorption, Chromophores, Nonlinear optics, Interfaces, In situ metrology

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Proceedings Article | 7 December 2001 Paper

Second-order nonlinear optical responses of ionically self-assembled films: polycation variations and dianionic chromophores

Patrick Neyman, M. Guzy, S. Shah, Rick Davis, Kevin Van Cott, Hong Wang, Harry Gibson, Charles Brands, James Heflin

Proceedings Volume 4461, (2001) https://doi.org/10.1117/12.449834

KEYWORDS: Chromophores, Second-harmonic generation, Polymers, Nonlinear optics, Absorbance, Glasses, Ions, Molecules, Polarization, Self-assembled monolayers

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Proceedings Article | 13 November 2001 Paper

Electrochromic switching in ionically self-assembled nanostructures

Jerzy Janik, James Heflin, Daniela Marciu, Michael Miller, Hong Wang, Harry Gibson, Rick Davis

Proceedings Volume 4458, (2001) https://doi.org/10.1117/12.448242

KEYWORDS: Absorption, Switching, Polymers, Control systems, Ions, Photodiodes, Nanostructures, Polymer thin films, Liquids, Absorbance

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Proceedings Article | 5 February 2001 Paper

Photoluminescence studies on energy migration in multilayer organic photovoltaic devices based on ionically self-assembled monolayers

Raoul Schroeder, C. Soman, Charles Brands, James Heflin, Wilhelm Graupner, Hong Wang, Harry Gibson, Daniela Marciu, Michael Miller

Proceedings Volume 4108, (2001) https://doi.org/10.1117/12.416935

KEYWORDS: Excitons, Luminescence, Molecules, Diffusion, Solar energy, Photovoltaics, Reflection, Self-assembled monolayers, Absorption, Scattering

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Proceedings Article | 19 May 2000 Paper

Thermal stability and immersion solution dependence of second-order nonlinear optical ionically self-assembled films

Charles Figura, Patrick Neyman, Daniela Marciu, Charles Brands, Mandy Murray, Steve Hair, Rick Davis, Michael Miller, James Heflin

Proceedings Volume 3939, (2000) https://doi.org/10.1117/12.386378

KEYWORDS: Chromophores, Polymers, Nonlinear optics, Second-harmonic generation, Temperature metrology, Polymer thin films, Self-assembled monolayers, Interfaces, Absorbance, Glasses

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Proceedings Article | 17 April 2000 Paper

Efficiency optimization in ionically self-assembled thin film polymer light-emitting diodes

Daniela Marciu, M. Miller, A. Ritter, M. Murray, Patrick Neyman, Wilhelm Graupner, James Heflin, Hong Wang, Harry Gibson, Rick Davis

Proceedings Volume 3938, (2000) https://doi.org/10.1117/12.382828

KEYWORDS: Polymers, Aluminum, Luminescence, Absorption, Interfaces, Electrodes, Light emitting diodes, Thin films, Organic light emitting diodes, Polymer thin films

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Proceedings Article | 17 April 2000 Paper

Photovoltaic responses in ionically self-assembled nanostructures containing conjugated polymers and fullerenes

Charles Brands, T. Piok, Patrick Neyman, A. Erlacher, C. Soman, M. Murray, Raoul Schroeder, James Heflin, Wilhelm Graupner, Daniela Marciu, Adam Drake, Michael Miller, Hong Wang, Harry Gibson, Harry Dorn, Guenther Leising, M. Guzy, Rick Davis

Proceedings Volume 3937, (2000) https://doi.org/10.1117/12.382794

KEYWORDS: Photovoltaics, Absorption, Reflection, Modulation, Fullerenes, Polymers, Thin films, Glasses, Aluminum, Solids

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Proceedings Article | 21 July 1998 Paper

Ionically self-assembled second-order nonlinear optical thin film materials and devices

Yanjing Liu, Youxiong Wang, Wei Zhao, Richard Claus, Kevin Lenehan, James Heflin

Proceedings Volume 3330, (1998) https://doi.org/10.1117/12.316960

KEYWORDS: Thin films, Thin film devices, Self-assembled monolayers, Quartz, Harmonic generation, Chromophores, Nonlinear optics, Polymers, Thin film deposition, Sensing systems

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Proceedings Article | 13 October 1997 Paper

Second-order nonlinear optical thin films fabricated from ionically self-assembled monolayers

James Heflin, Yanjing Liu, Charles Figura, Daniela Marciu, Richard Claus

Proceedings Volume 3147, (1997) https://doi.org/10.1117/12.284253

KEYWORDS: Self-assembled monolayers, Thin films, Polarization, Chromophores, Second-harmonic generation, Harmonic generation, Polymers, Absorbance, Quartz, Polarizers

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Proceedings Article | 10 October 1997 Paper

Optical limiting over an extended spectral region by derivatization of C60

James Heflin, Daniela Marciu, Charles Figura, S. Wang, R. Yordanov, James Withers

Proceedings Volume 3146, (1997) https://doi.org/10.1117/12.284160

KEYWORDS: Optical limiting, Absorption, Transmittance, Saturable absorption, Optical testing, Fullerenes, Data analysis, Spherical lenses, Molecules, Transparency

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Proceedings Article | 16 December 1996 Paper

Degenerate four-wave mixing in endohedral metallofullerenes and optical limiting of C60 derivatives and higher fullerenes

James Heflin, Daniela Marciu, Charles Figura, S. Wang, P. Burbank, S. Stevenson, Harry Dorn, James Withers

Proceedings Volume 2854, (1996) https://doi.org/10.1117/12.262978

KEYWORDS: Fullerenes, Optical limiting, Absorption, Transmittance, Saturable absorption, Four wave mixing, Optical testing, Molecules, Erbium, Nonlinear optics

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Proceedings Article | 8 December 1995 Paper

Optical limiting of C60, C60 charge-transfer complexes, and higher fullerenes from 532 to 750 nm

James Heflin, S. Wang, Daniela Marciu, Charles Figura, R. Yordanov

Proceedings Volume 2530, (1995) https://doi.org/10.1117/12.228117

KEYWORDS: Absorption, Optical limiting, Saturable absorption, Fullerenes, Transmittance, Optical testing, Nonlinear optics, Metals, Molecules, Light

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Proceedings Article | 1 February 1992 Paper

Two-photon correlated states and third order nonlinear optical processes in linear chains

J. Heflin

Proceedings Volume 1599, (1992) https://doi.org/10.1117/12.2322314

KEYWORDS: Physics, Chemistry, Medicine, Dispersion, Polarizability, Particles, Carbon, Polymers, Harmonic generation, Oscillators

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Proceedings Article | 1 December 1991 Paper

Experimental measurements and electron correlation theory of third-order nonlinear optical processes in linear chains

James Heflin, Yongming Cai, Qihou Zhou, Anthony Garito

Proceedings Volume 1560, (1991) https://doi.org/10.1117/12.50700

KEYWORDS: Dispersion, Organic materials, Polymers, Harmonic generation, Liquids, Electro optic polymers, Particles, Glasses, Physics, Ultrafast phenomena

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Proceedings Article | 1 September 1991 Paper

Excited-state nonlinear optical processes in polymers

James Heflin, Qihou Zhou, Anthony Garito

Proceedings Volume 1497, (1991) https://doi.org/10.1117/12.46798

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Proceedings Article | 1 December 1990 Paper

Excited-state nonlinear optics and enhancement mechanisms for nonresonant processes

James Heflin, Qihou Zhou, King-Young Wong, O. Zamani-Khamiri, Anthony Garito

Proceedings Volume 1337, (1990) https://doi.org/10.1117/12.22945

KEYWORDS: Organic materials, Dispersion, Optical pumping, Nonlinear optics, Four wave mixing, Silicon, Laser beam diagnostics, Kerr effect, Harmonic generation, Physics

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