Agarwal Group

Year: 2011

  • Tailoring hot-exciton emission and lifetimes in semiconducting nanowires via whispering-gallery nanocavity plasmons

  • One-dimensional polaritons with size-tunable and enhanced coupling strengths in semiconductor nanowires

  • Hee-Suk Chung completes his post-doctoral candidature

    Hee-Suk Chung has completed his post-doctoral candidature with the group. He is headed to Samsung, South Korea. The group wishes him all the very best for his future and will surely miss him and his expertise!

  • High Resolution Transmission Electron Microscopy Study of Electrically-Driven Phase Change Phenomena in Ge2Sb2Te5 Nanowires

  • Incorporating Polaritonic Effects in Semiconductor Nanowire Waveguide Dispersion

  • Latest News

  • Nanowire Transformation by Size-Dependent Cation Exchange Reactions

  • 2011

    Click to enlarge 39. J. D. Cox, M. R. Singh, C. Racknor, and R. Agarwal, “Switching in Polaritonic–Photonic Crystal Nanofibers Doped with Quantum Dots”, Nano Letters. [Link] Click to enlarge 38. Christopher M. Rodd and Ritesh Agarwal, “Enhancement of Interfacial Polymer Crystallinity Using Chromism in Single Inorganic Nanowire–Polymer Nanohybrids for Photovoltaic Applications”, Nano Letters. [Link]…

  • 2010

    Click to enlarge 32. L.K. Van Vugt, B. Piccione, and R. Agarwal*, “Incorporating Polaritonic Effects in Semiconductor Nanowire Waveguide Dispersion”, Applied Physics Letters [Link] Click to enlarge 31. M. Mitra, Y. Jung, and R. Agarwal, “Extremely Low Drift of Resistance and Threshold Voltage in Amorphous Phase Change Nanowire Devices”, Applied Physics Letters[Link] Click to enlarge…

  • 2009

    Click to enlarge 28. H.-S. Chung, Y. Jung, S. C. Kim, D. H. Kim, K. H. Oh and R. Agarwal, “Epitaxial Growth and Ordering of GeTe Nanowires on Microcrystals Determined by Surface Energy Minimization”, Nano Letters[Link] Click to enlarge 27. Y. Jung, C.-Y. Yang, S.-H. Lee and R. Agarwal, Phase-Change Ge-Sb Nanowires: Synthesis, “Memory Switching,…

  • 2008

    23. Y. Jung, S.-H. Lee, D.-K. Ko, and R. Agarwal, “Size-dependent Surface-induced Heterogeneous Nucleation Driven Phase-change in Ge2Sb2Te5 Nanowires”, Nano Letters, 8, 3303 (2008). [Link] 22. O. Hayden, R. Agarwal*, and W. Lu, “Semiconductor Nanowire Devices – Bottom Up Meets Top Down”, Nano Today, 3, 12 (2008). [Link] 21. Y. Jung, S.-H. Lee, A. T.…

  • 2007

    17. S.-H. Lee, Y. Jung and R. Agarwal, “Highly-scalable Nonvolatile and Ultra-low Power Phase-change Nanowire Memory”, Nature Nanotechnology, 2, 626 (2007). [Link] 16. Y. Jung, D-K Ko, and R. Agarwal, "Synthesis and Structural Characterization of Branched Nanowire Heterostructures," Nano Letters. 7, 264 -268, 2007. [Link]

  • 2006

    15. Y. Jung, S.-H. Lee, D.-K. Ko, and R. Agarwal, “Synthesis and Characterization of Ge2Sb2Te5 Nanowires with Memory Switching Effect”, J. American Chemical Society, 128, 14026, (2006). 14. S.-H. Lee, D.-K. Ko, Y. Jung and R. Agarwal, “Size-Dependent Phase Transition Memory Switching Behavior and Low Writing Currents in GeTe Nanowires”, Appied. Physics Letters, 89, 223116,…

  • 2005 and Earlier

    11. R. Agarwal, K. Ladavac, Y. Roichman, G. Yu, C. M. Lieber & D. G. Grier," Assembling Semiconductor Nanowire Heterostructures with Holographic Optical Traps," Optics Express 13, 8906-8912 (2005). 10. R. Agarwal, C. J. Barrelet and C. M. Lieber, "Lasing Mechanism in Single Cadmium Sulfide Nanowire Optical Cavities," Nano Letters 5, 917-920 (2005). 9. X.…

  • Ritesh Agarwal

    Professor Srinivasa Ramanujan Distinguished Scholar Materials Science and Engineering 3231 Walnut Street Philadelphia, PA 19104-6272 Office: LRSM 324 Phone: (215) 573-3037 Email: riteshag[at]seas.upenn.edu [CV] [Biography]

  • Visiting Researchers

    Do Hyun Kim Phase change, strain engineering

  • Ph.D. Students

    Yuhui Wang Semiconductor Plasmonics   Harshvardhan Jog Topological Materials   Yicong Chen Topological Materials   Jia-Chen Shi Topological Photonics   Utkarsh Khandelwal Topological Materials   Shupeng Xu Topological Photonics  

  • People

  • Ritesh Agarwal Receives 2010 NIH New Innovator Award

    Excerpted from the UPenn SEAS website: Ritesh Agarwal, assistant professor in the department of Materials Science and Engineering, has been awarded the 2010 NIH Director’s New Innovator Award from the National Institutes of Health, providing $1.5 million over five years to support his research into improving biological imaging using nanotechnology. The awards are given by…

  • Nanoscale Phase Change

  • Mariam Georges (joint with Dan Gianola, MSE), expected May 2011.

  • Christopher Rodd

    Nanowire-Conducting Polymer Hybrid Systems May 2011

  • Brian Piccione

    Light-Matter Coupling in Nanowire Optical Cavities http://www.seas.upenn.edu/~bpic/

  • Carlos Aspetti

    Nanowire plasmonics May 2014

  • Pavan Nukala

    Phase Change Nanowires: insitu microscopy analysis May 2014 http://www.seas.upenn.edu/~pnukala/

  • Rahul Agarwal

    Chalcogenide nanowires, Phase change and thermoelectrics May 2015

  • Joohee Park

    Nanowire Optics May 2015

  • Siddharth Ghosh

    (Jointly with G. Piazza, ESE, Penn) Nanowire Optomechanics May 2014

  • Nanoscale Photonics

  • Postdocs

    Dr. Youngchul Leem       Dr. Minsoo Hwang       Dr. Wenjing Liu Semiconductor Plasmonics    

  • Haofeng Li (Nanowire Photovoltaics), expected May 2011

  • Undergraduates

    Sonya Kripke Synthesis and Characterization of Te based nanostructures for thermoelectric applications   Karthik Kumar Ultra-small phase change nanowires   Aaron Wirshba Nanowire waveguides  

  • Past Postdocs

    Dr. Chang-Hee Cho (Semiconductor Nanophotonics and Plasmonics); Currently Assistant Professor at Daegu Gyeongbuk Institute of Science and Technology (DGIST), Department of Emerging Materials Science, Korea. Dr. Hee-Suk Chung (Phase Change Materials, in-situ TEM); Currently senior engineer at Samsung Inc. electro-mechanics, Korea Dr. Sung Wook Nam (Phase Change Materials, in-situ TEM); Currently Research Scientist at IBM.…

  • Past Ph.D. Students

    Carlos O. Aspetti (Surface plasmon-based engineering of semiconductor nanowire optics): PhD Awarded Dec 2014. Management Consultant in Greater New York Metropolitan Area. Chris Rodd (Light-Matter Coupling in Nanowire Optical Cavities): PhD Awarded May 2013. Patent Examiner at U.S. Patent Office. Brian Piccione (Light-Matter Coupling in Nanowire Optical Cavities): PhD Awarded May 2013. Postdoctoral fellow at…

  • Past Masters Students

    Haofeng Li (Polymer/Semiconductor hybrid solar cells): May 2011. Currently Ph.D. student at Dartmouth College, Thayer School of Engineering. Dong-Kyon Ko (Growth of Phase Change Nanowires): Dec 2006. Currently Ph.D. student at Penn Chemistry. Yu-Han Cheng (Controlled Growth of High-Density Nanowires): May 2007. Currently Ph.D. student at  UCSD. Tyler Zimmerman (Nanowire Solar Cells): May 2008. Currently at Boeing…

  • Past Undergraduates

    Karthik Kumar (Ultra-small phase change nanowire, characterization and growth) Aaron Wishba (Nanowire waveguides) Rahil Mehrotra (Radiation effects on phase change nanowire devices) Thomas Walsh (Radiation effects on phase change nanowire devices) Shoham Bhadra (Nanowire spectrometer) Eric Mills (Nanowire spectrometer) Arthur Spector (Nanowire waveguide dispersion) Mariam Georges (Bio inspired photovltaics) Justin Chung (Coupled nanowire LED-detector systems)…

  • Nanowire Phase Change Memory, University of Pennsylvania

    Featured amongst the top five biggest advance in nanoscience in 2007 by MIT Technology Review Featured on Comcast Network Channel on cable television as a part of Art Fennel Reports show, Dec 19th, 2007. Phase Change Nanowire images displayed at the New York Museum of Modern Art as a part of the exhibition “Design and…

  • Assembly of Nanowires with Optical Tweezers, Harvard University

    Cover story in Photonics Spectra magazine, Jan 2006. Featured in Harvard Crimson, Jan 2006. TRN news roundup, “Holograms Organize Nanowires”, Dec 2005. Nano Today magazine, Feb 2006, “Assembling Nanowires is a HOT Topic”.

  • 35

    Y. Jung, S.W. Nam, and R. Agarwal, “High Resolution Transmission Electron Microscopy Study of Electrically-Driven Phase Change Phenomena in Ge2Sb2Te5 Nanowires”. [Link] <<Click to enlarge

  • 34

    Y. Jung, R. Agarwal, C.Y. Yang and R. Agarwal*, “Chalcogenide Phase-change Memory Nanotubes for Lower Writing Current Operation”, Nanotechnology, invited paper for the nanoscale memory issue, accepted. <<Click to enlarge

  • 33

    L. K. Van Vugt, B. Piccione, C.H. Cho, C. Aspetti, A. Wirshbha and R. Agarwal, “Variable Temperature Spectroscopy of as-grown and Passivated CdS Nanowire Optical Waveguide Cavities”, J. Physical. Chemistry, invited paper for special issue for G. R. Fleming. [Link] <<Click to enlarge

  • 32

    L.K. Van Vugt, B. Piccione, and R. Agarwal*, “Incorporating Polaritonic Effects in Semiconductor Nanowire Waveguide Dispersion”, Applied Physics Letters, 97, 061115 (2010) [Link] <<Click to enlarge

  • 31

    M. Mitra, Y. Jung, and R. Agarwal, “Extremely Low Drift of Resistance and Threshold Voltage in Amorphous Phase Change Nanowire Devices”, Applied Physics Letters, 96, 222111 (2010) [Link] <<Click to enlarge

  • 30

    B. Piccione, L. K. Van Vugt and R. Agarwal, “Propagation Loss Spectroscopy on Single Nanowire Active Waveguides”, Nano Letters, 10, 2251 (2010). [Link] <<Click to enlarge

  • 29

    B. Zhang, Y. Jung, H.-S. Chung, L. K. Van Vugt and R. Agarwal’ “Nanowire Transformation by Size-Dependent Cation Exchange Reactions”, Nano Letters, 10, 149 (2010). [Link] <<Click to enlarge

  • 27

    H.-S. Chung, Y. Jung, S. C. Kim, D. H. Kim, K. H. Oh and R. Agarwal, “Epitaxial Growth and Ordering of GeTe Nanowires on Microcrystals Determined by Surface Energy Minimization”, Nano Letters, 9, 2395 (2009).

  • 26

    L.K. van Vugt, B. Zhang, B. Piccione, A. Spector and R. Agarwal, “Size-Dependent Waveguide Dispersion in Nanowire Optical Cavities: Slowed Light and Dispersionless Guiding”, Nano Letters (2009). DOI: 10.1021/nl900371r

  • 24

    N. J. Pinto, K. V. Carrasquillo, C. M. Rodd, and R. Agarwal, “Rectifying Junctions of Tin Oxide and Poly(3-hexylthiophene) Nanofibers Fabricated via Electrospinning”, Applied Physics Letters, 94, 083504 (2009).

  • 23

    Y. Jung, S.-H. Lee, D.-K. Ko, and R. Agarwal, “Size-dependent Surface-induced Heterogeneous Nucleation Driven Phase-change in Ge2Sb2Te5 Nanowires”, Nano Letters, 8, 3303 (2008).

  • 22

    O. Hayden, R. Agarwal*, and W. Lu, “Semiconductor Nanowire Devices – Bottom Up Meets Top Down”, Nano Today, 3, 12 (2008).

  • 21

    Y. Jung, S.-H. Lee, A. T. Jennings, and R. Agarwal, “Core-Shell Heterostructured Phase Change  Nanowire Multi-state Memory”, Nano Letters, 8, 2056 (2008) [Link]

  • Agarwal R, Mitra M, Jung Y, “System and Method for the Relaxation of Stress in Phase Change Memory Devices”, International patent application, PCT/US2010/050134

  • C. M. Lieber, X. Duan, Y. Huang, and R. Agarwal, “Nanoscale Coherent Optical Components”, 10/624,135, U.S. patent pending; 10/734,086 U.S. Continuation Patent, Pending of 10/624,135.

  • D.G. Grier, R. Agarwal, G. Yu, K. Ladavac, and C. M. Lieber, “System and Method for Processing Nanowires with Holographic Optical Tweezers”, U.S. Provisional Patent, awarded 2009.

  • “Two-Color Three Pulse Photon Echo Peak Shift, ” R. Agarwal, B. S. Prall, A. H. Rizvi, M. Yang, and G.R. Fleming, Ultrafast Phenomena XIII, Eds. R. D. Miller, M. M. Murnane, N. F. Scherer and A. M. Weiner, (Springer, Berlin), 532 (2003).

  • “Disorder in Photosynthetic Light Harvesting Complexes: A Three-Pulse Photon Echo Peak Shift Study,” R. Agarwal, M. Yang, and G. R. Fleming, Ultrafast Phenomena XII, Eds. T. Elsaesser, S. Mukamel, M. M. Murnane and N. F. Scherer (Springer, New York), 653 (2000).

  • 20

    S.-H. Lee, Y. Jung and R. Agarwal, “Highly-scalable Nonvolatile and Ultra-low Power Phase-change Nanowire Memory”, Nature Nanotechnology, 2, 626 (2007). [Link]

  • 19

    S.-H. Lee, Y. Jung, A. T. Jennings and R. Agarwal*, “Comparative Study of Memory Switching Phenomena in Phase Change GeTe and Ge2Sb2Te5 Nanowire Devices”, Physica E, 40, 2474 (2008).

  • 18

    R. Agarwal*, “Hetero-interfaces in Semiconductor Nanowires”, Small 4, 1872 (2008).

  • 17

    H.-S. Chung, Y. Jung, S.-H. Lee, T. J. Zimmerman, J. W. Kim, S. H. Lee, S. C. Kim, K. H. Oh and R. Agarwal, “A Generic Approach for Catalyst-supported Vertically-aligned Nanowire Growth”, Nano Letters, 8, 1328 (2008).

  • 16

    Y. Jung, D-K Ko, and R. Agarwal, “Synthesis and Structural Characterization of Branched Nanowire Heterostructures,” Nano Letters. 7, 264 -268, 2007.

  • 15

    Y. Jung, S.-H. Lee, D.-K. Ko, and R. Agarwal, “Synthesis and Characterization of Ge2Sb2Te5 Nanowires with Memory Switching Effect”, J. American Chemical Society, 128, 14026, (2006).

  • 14

    S.-H. Lee, D.-K. Ko, Y. Jung and R. Agarwal, “Size-Dependent Phase Transition Memory Switching Behavior and Low Writing Currents in GeTe Nanowires”, Appied. Physics Letters, 89, 223116, (2006).

  • 13

    R. Agarwal*, and C. M. Lieber, “Semiconductor Nanowires: Optics and Optoelectronics”,  Applied Physics. A: Mater. Sci. Proc. 85, 209-215 (2006).

  • 12

    R. Agarwal, K. Ladavac, Y. Roichman, G. Yu, C. M. Lieber & D. G. Grier,” Assembling Semiconductor Nanowire Heterostructures with Holographic Optical Traps,” Optics Express 13, 8906-8912 (2005).

  • 11

    O. Hayden, R. Agarwal and C. M. Lieber, “Nanowire based Avalanche Photodiodes,”  Nature Materials, 5, 352 (2006). (cover article)

  • 10

    R. Agarwal, C. J. Barrelet and C. M. Lieber, “Lasing Mechanism in Single Cadmium Sulfide Nanowire Optical Cavities,” Nano Letters 5, 917-920 (2005)

  • 9

    X. Duan, Y. Huang, R. Agarwal, and C.M. Lieber, “Single-Nanowire Electrically Driven Lasers,” Nature 421, 241 (2003).

  • 8

    G. R. Fleming, M. Yang, R. Agarwal, B. S. Prall, L. J. Kaufman and F. Neuwahl, “Two-Dimensional Electronic Spectroscopy,” invited paper Bull. Kor. Chem. Soc., 24, 1081 (2003).

  • 7

    K. Kwak, M. Cho, G. R. Fleming, R. Agarwal, and B. S. Prall, “Two-Color Transient Grating Spectroscopy of a Two-level System,” invited paper, Bull. Kor. Chem Soc. 24, 1069 (2003).

  • 6

    R. Agarwal, A. H. Rizvi, B. S. Prall, J. D. Olsen, C. N. Hunter, and G. R. Fleming, “The   Nature of Disorder and Inter-complex Energy Transfer in LH2 at Room Temperature:  A  Three Pulse Photon Echo Peak Shift Study,” J. Physica. Chemistry A, 106, 7573 (2002).,

  • 5

    R. Agarwal, B. S. Prall, A. H. Rizvi, G. R. Fleming, “Two Color Three Pulse Photon Echo Peak Shift Spectroscopy,” J. Chemical Physics, 116, 6243 (2002).

  • 4

    M. Yang, R. Agarwal, G. R. Fleming, “Mechanism of Photosynthetic Energy Transfer in Purple Bacteria,” invited paper for Lord Porter issue, J. of Photochem. and Photobio., Part A, 142, 107 (2001).

  • 3

    R. Agarwal, M. Yang, Q.-H. Xu, and G. R. Fleming, “Three-Pulse Photon Echo Peak Shift Study of the B800 band of the LH2 complex of Rps. acidophila at room temperature: A Coupled Master Equation and Non-linear Optical Response Function Approach,” J. Physical. Chemistry B, 105, 1887 (2001).

  • 2

    R. Agarwal, B. P. Krueger, G. D. Scholes, M. Yang, J. Yom, L. Mets, and G. R. Fleming, “Ultrafast Energy Transfer in LHC-II Revealed by Three-Pulse Photon Echo Peak Shift Measurements,” J. Physical. Chemistry B, 104, 2908 (2000).

  • 1

    M.-L. Groot, J.-Y. Yu, R. Agarwal, J. R. Norris, and G. R. Fleming, “Three-Pulse Photon Echo Measurements on the Accessory Pigments in the Reaction Center of Rhodobacter sphaeroides,” J. Physical. Chemistry B, 102, 5923 (1998).

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