Novel classical and quantum photonic devices by manipulating light-matter interactions in low-dimensional systems

Ritesh Agarwal
University of Pennsylvania, USA
16:00~16:45,November 19th , 2015

Abstract :

Strongly confined electrical, optical and thermal excitations drastically modify material’s properties and break local symmetries that can enable precisely tunable novel responses and new functionalities. With an emphasis on low-dimensional materials such as nanowires and monolayer MoS2, we will discuss how extreme confinement of fields interacting with low-dimensional materials produces new and unexpected materials response. For example, we will discuss how the strong plasmonic fields can lead to a new paradigm of nanoscale Si-based photonics such as optical emission in the visible region and nonlinear optical devices. Furthermore, by utilizing the fundamental symmetry breaking properties of fields, new quantum phenomena such as chirality-dependent optical and electronic properties will be discussed in non-chiral materials and utilized to enable new functionalities that are only possible in strong spin-orbit coupled materials. The role of geometry such as in nanowires to produce new properties in the presence of symmetry breaking fields will be discussed. Finally, effect of plasmons on light matter interactions in 2D excitonic crystals will be discussed, which can be engineered to produce novel responses such as enhanced emission and Fano resonances.



Biography :

Ritesh Agarwal earned his undergraduate degree from the Indian Institute of Technology, Kanpur in 1996, and a master’s degree in chemistry from the University of Chicago. He received his Ph.D. in physical chemistry from the University of California at Berkeley in 2001. After completing his Ph.D., Ritesh was a postdoctoral fellow at Harvard where he studied the optical and photonic properties of semiconductor nanowires. His work led to the development of electrically-driven single nanowire lasers and avalanche photodiodes. Ritesh is currently a professor in the Department of Materials Science and Engineering at the University of Pennsylvania. His research interests include understanding and engineering light-matter interactions at the nanoscale using a variety of one- and two-dimensional semiconductors, plasmonic nanocavities, and studying phase transitions and electronic memory switching at the nanoscale. His group is actively involved in the development of new experimental techniques to probe the novel properties of materials at the nanoscale and the development of new electronic, optical and energy conversion devices. Ritesh is the recipient of the NSF CAREER award in 2007, NIH Director’s New Innovator Award in 2010 and the SPIE Symposium Nanoengineering Pioneer award in 2014.



Professional Activities :

  • 2010 Special Topics: Optics of Advanced Materials (MSE 795)
  • 2006-2007 Thermodynamics of Materials (MSE 530)
  • 2006-2010 Introduction to Nanoscale Materials (MSE 215)
  • 2006-2009 Nanoscale Materials Laboratory (MSE 250)
  • 2005.9 Present, Assistant Professor, Department of Materials Science and Engineering, University of Pennsylvania
  • 2002.1-2005.8 Postdoctoral Fellow, Department of Chemistry and Chemical
    Biology, Harvard University. (Advisor: Prof. Charles M. Lieber)
  • 1997 M.S. in Chemistry, University of Chicago
  • 1996 M.Sc. (5yr Integrated) in Chemistry, Indian Institute of Technology, Kanpur



Service :

  • 2007-present Chair, Materials Science and Engineering, ABET Committee
  • 2010.4 MSE Chair Selection Committee
  • 2010-present Member, Strategic Planning Committee, Materials Research Society
  • 2007-2008 Seminar Series Organizer, Penn Materials Science and Engineering
  • 2007.8 Session Chair, American Chemical Society Meeting, Boston
  • 2006-present Graduate Students Admissions Committee