Research Summary:

Professor Sridhar's principal areas of research are Nanomaterials and Nanomedicine and Left-Handed Metamaterials.

Nanomaterials and Nanomedicine: Prof. Sridhar is Director of the Electronic Materials Research Institute, an interdisciplinary institute formed to catalyze and synergize the University’s research in nanomaterials. He also directs the Nanomedicine consortium, a collaboration between faculty from several departments and area medical research hospitals researching applications of nanotechnology to medical problems including diagnosis and therapy of cancer, infectious and cardiovascular diseases. Ongoing projects include functionalized nanoparticles, energy, drug and gene delivery using nanoparticles, electromagnetic hyperthermia, and magnetic nanoparticles as MRI contrast agents. Prof. Sridhar is the director of the IGERT Nanomedicine Science and Technology program (see www.igert.neu.edu).

Left-Handed Metamaterials: Artificial materials with negative refractive index are called left handed materials because of the unusual electromagnetic wave propagation in them. We have several significant results on negative refraction and imaging. Our paper in Nature (2003) on flat lens imaging was cited as one of the Breakthroughs of 2003 by Science, and by Physics News 2003 by the American Physical Society. Our work has received extensive attention in the scientific community as well as the online and print popular press.

Recent Publications:

"A New Mechanism for Negative Refraction and Focusing Using Selective Diffraction from Surface Corrugation", W.T. Lu, Y.J. Huang, P. Vodo, R.K. Banyal, C. H. Perry, and S.Sridhar. Optics Express, V. 15, P. 9166 (2007).
PDF Document: http://sagar.physics.neu.edu/preprints/selective_grating_NR_OptExp_15_9166.pdf

"Alternative Approach to All-Angle-Negative-Refraction in Two-Dimensional Photonic Crystals", Y. J. Huang, W T. Lu, and S. Sridhar, Phys. Rev. A, V. 76, P. 013824.
PDF Document: http://sagar.physics.neu.edu/preprints/large_sigma_2DPC_PhysRevA_76_013824.pdf

"Experimental Realization of a Generalized Superlens at the Infrared Wavelengths", R.K. Banyal, B.D.F. Casse, W.T. Lu, Y.J. Huang, S. Selvarasah, M. Dokmeci, C. H. Perry, and S. Sridhar, Physical Review letters (2007). Submitted.

"High-throughput Assembly of Nanoelements in Nanoporous Alumina Templates", P. E. Gultepe, D. Nagesha, L. Menon, A. Busnaina, S. Sridhar, Applied Physics Letters, V. 90, P. 163119 (2007).
PDF Document: http://sagar.physics.neu.edu/preprints/ApplPhysLett_90_163119-1.pdf

"Superlens Imaging Theory for Anisotropic Nanostrutured Metamaterials with Broadband All-angle Negative Refraction", W. T. Lu and S. Sridhar, Physical Review Letters (2007). Submitted.

Related links:

Left-Handed Metamaterials and Nanomedicine laboratory
(a complete list of publications can also be found here)