Yohan Seepersad


Bio:   Yohan earned his PhD in Electrical Engineering from Drexel University in July 2015. Currently employed as a research assistant at the A.J. Drexel Plasma Institute, exploring the area of nanosecond pulsed plasma generation in liquids. Other research interests include applied plasma physics and diagnostics, optics, non-thermal plasma, photonics, control engineering and advanced system theory.

He served as a teaching assistant in the College of Engineering at Drexel University for four years, involved heavily with both graduate and undergraduate systems and controls classes. He has a strong interest in education work in STEM related fields. His programming experience includes Monte Carlo simulations of rarefied gas dynamics in a solar radiometer using PIC simulations in MATLAB and a wide-band spectrum analyzer for dynamic spectrum sensing developed using PYTHON. He also has prior experience working with single crystal silicon solar cells at IBM's T.J. Watson Research Center, characterizing quantum efficiency and device parameters.

Research:   Yohan works with the Drexel Plasma Institute ( ). This document contains  Yohan's publications.

Yang Gao


Bio:  Yang earned her Ph.D in Electrical Engineering from Drexel in June 2015. She completed her Bachelor’s and Master’s degree in Electrical Engineering at Xi'an Jiaotong University in China. She started her research work in the Nanophotonics lab since 2009 on Nano materials synthesis and devices for single cell applications. Outside of research, she loves  traveling, reading and cooking.

Research:  Yang is interested in carbon nanopipette and carbon nanotube for cellular probing. Working with a strong professors group from ECE, MSE and Surgery department of Drexel, she is focusing on integrating multiple tasks into the nanoprobe and developing new mechanics of detecting. She is also working with collaborator from Queen College, New York on optimizing the carbon nano pipette as  nano-electrode for electro-chemistry applications and collaborator from Temple University for localized micro perfusion system for neuron applications

Elizabeth Plowman


Bio: Liz graduated with a BS and MS in Electrical Engineering in June of 2015.  She enjoys singing opera and being awesome.

Research:  Percolation

Sylvia Herbert

Email:  sylvia.lee.herbert <at>


Bio: Sylvia graduated with her BS and MS in Mechanical Engineering and Mechanics in June of 2014.  She now is a PhD student in Electrical Engineering at University of California Berkeley.  In her spare time she enjoys reading, playing ukulele, annoying her little brothers, and traveling to interesting countries.

Research: Sylvia's thesis focused on a novel photolithography method for manufacturing liquid crystal waveguides and optical switches.  She also worked with Ben Pelleg and Alyssa Bellingham to develop H-PDLCs for display applications.  H-PDLC stands for Holographically Formed, Polymer Dispersed Liquid Crystal. This is a thin film of polymer and liquid crystal that has been treated with a split laser to form a reflective Bragg grating.  These H-PDLCs have the potential to make reflective, low cost displays that maintain the switching time of a liquid crystal (as opposed to other technologies like e-ink).

Sylvia has also worked with the newly founded ExCITe Center on making fabric antenna sensors to measure deformation. Silver-coated yarn is knitted into an antenna pattern using Shima Seiki industrial knitting machines.  When the knitted antenna is stretched, the change in size, shape, and tension in the fabric cause changes in antenna properties (both in resistance and return loss frequency).  Therefore this technology can be applied as a sensor for stretch in fabric.  This has a huge number of potential applications, but the current application we are focusing on is for our Smart Fabric Bellyband: a band of fabric worn around the stomach of a pregnant woman to comfortably measure uterine contractions

Ben Pelleg


Bio:  Ben Pelleg earned his PhD in Electrical Engineering from Drexel in 2014.  He earned a B.S. degree in applied and engineering physics from Cornell University in 2008.  Ben's graduate research focused on nanophotonics, specifically holographic polymer dispersed liquid crystals.  In addition to his technical interests, Ben has also acted as an NSF GK-12 fellow and taught science, math, and engineering to students in the School District of Philadelphia. Ben's work has led to various publications and presentations at national and international conferences. In his free time Ben plays ultimate Frisbee and enjoys cooking and eating.

Research:  Ben’s PhD research included the study of holographic polymer dispersed liquid crystals and other polymer/liquid crystal devices. Ben's research has led to work on applications in fields including displays, spectroscopy, imaging, and light filtering. The main goal of Ben's work is to fully understand how light interacts with H-PDLCs in terms of light reflections, scattering, and absorption.

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Jared Coyle


Bio:  Dr. Coyle received his Ph.D in Electrical & Computer Engineering with a B.S. in Chemical Engineering from Drexel University in 2013. He is a former NSF IGERT Nanotechnology Fellow and an NSF GK12 Engineering Education Fellow. Jared's research focused on the applications of novel optoelectronic soft material composites (polymer, liquid crystal and carbon allotropes) in organic photovoltaics, display technology, RF electronics, and imaging systems. Jared is also a passionate educator who helps to connect high schools in inner city Philadelphia with partner schools in East Africa.

Research:  Jared research focus was the electrical percolation of onion-like carbon in conductive media. At relatively low loadings, highly conductive concentric spheres of nano-scale carbon are combined with a conductive polymer to create highly conductive, flexible films ideally suited for applications in many optoelectronic devices, such as solar photovoltaic cells, RF electronics, transport interlayers for thin film electronics, and high efficiency electromagnetic radiation blocking. Specifically, Jared's research focused on an understanding of the conductive mechanism of this two-part composite system through a comparison of applied laboratory results with theoretical nano-scale simulations.

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Dr. David Delaine

David graduated with his Electrical Engineering Ph.D. in 2012. He earned his BS degree in electrical engineering in 2005 from Northeastern University and received his MS in electrical engineering from Drexel University in 2007. His research included the development of novel power generation techniques through power scavenging with Stirling Engines, and the electrical poling of polymers. He is an active member IEEE, the Society of Hispanic Professional Engineers (SHPE), the National Society of Black Engineers (NSBE), and the American Association of Blacks in Energy (AABE)


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Dr. Sameet Shriyan

Sameet K. Shriyan received his PhD in the Department of Electrical and Computer engineering in 2010. He received his bachelors degree in Electronics and Communication engineering from Visveswarahia Technological University in India and his masters degree in Electrical/Telecommunications engineering here at Drexel University. His research area focused on developing novel stacking techniques  for holographic polymer dispersed liquid crystal thin films, wavefront analysis, morphology study, device physics and enhancing the electro-optic performance of these devices by doping them with carbon nanotubes. 


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Dr. Kashma Rai

Kashma's primary research interest was fabrication and creation of multiple configurations of holographic thin films for broadband wavelength applications. Material optimization of thin film hologram recipe for specific applications and modeling the interaction of light with them were essential part of my work at Drexel. Also an integral part of my research experience was the fundamental understanding of liquid crystal/polymer interaction using scanning electron microscopy (in high vacuum, variable pressure and environmental modes) and electron spin resonance spectroscopy (in collaboration with Zannoni Research Group).

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Dr. Anna Fox

Anna developed a real-time reconfigurable mask for contact photolithography fabricated from holographically formed polymer-dispersed liquid crystal films. Before pursuing her doctorate, Anna received her BS in Electrical Engineering from Columbia University and her MS in Engineering Science from Dartmouth College, Thayer School of Engineering. She has recently been awarded the National Science Foundation Graduate Student Research Fellowship supporting her work in adaptable thin-film based photomasks.

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Dr. Hemang Shah

Dr. Shah's research included working on alignment layers for Liquid Crystal Displays and interactions between Carbon Nanotubes and liquid crystals. Using ferroelectric polymers as alignment materials, he has developed a material set that can increase current display resolutions by 300%. His work also applies to the design and development of visible wavelength filters, which are tunable using electric fields. His collaboration with Materials Scientists have led to the first time imaging of liquid crystals inside carbon nanotubes using a Scanning Electron Microscope. This work is relevant to scientists studying fluid transport through carbon nanotubes for material storage and drug delivery applications. Hemang has been awarded the George Hill Jr. Fellowship (2005) and the NIST Summer Graduate Fellowship (2003). He graduated in 2007.

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Joshua Freedman

Josh researched the development of magnetic carbon nanotube based biological probes. This work gives biologists new capabilities to transfer fluids to and from intracellular regions which may advance the fields of molecular diagnostics, cellular biology, and pharmacology. He collaborated with members of the material science dept., chemistry dept., and medical school in research efforts aimed at the integration of biology and nanotechnology. Josh is a two-time winner of the National Science Foundations IGERT fellowship, Drexel University Dean’s fellowship, the Dean’s Award for Best Poster of Research Day 2006, and National Science Foundations GRFP Honorable Mention 2006. He joined the group in 2005. 

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Bill Norman

Bill completed the requirements for the MSEE (signal processing track) degree in June 2007. Previously, Bill earned a BSEE at Drexel in 2005, and a BS in Secondary Education from Pennsylvania State University in 1998. His primary research over the course of his graduate experience involved the localization of a field of ultra-wideband radios. The work involved the development of an algorithm that computes the position of location-unknown radios relative to the position of location-known radios.