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G.V. Pavan KumarAssistant Professor, PhysicsRoom no. 208, h-cross, Experimental Physics Building,Indian Institute of Science Education and Research, PunePune, Maharashtra 411021, Indiapavan@iiserpune.ac.in

ProfileResearch Employment:

Assistant Professor and DST Ramanujan Fellow (Physical Sciences) (since May 2010) - IISER, Pune

Post-Doc Fellow (2009- May 2010), Discovery Park, Purdue University, USA

ICFO-JdC Fellow (2008-2009), ICFO - The Institute of Photonic Sciences, Barcelona, Spain

Education:

Ph.D. (2008) - JNCASR, Bangalore

M.Sc. (2004) - Physics, Bangalore University

B.Sc. (2002) - Physics, Maths, Electronics, M.E.S. College, Bangalore University

Honors Diploma in Space Science from ISRO (2003)

research DescriPtion Brief outline of the research project, complete with objectives:

Surface plasmon polaritons (SPPs) and localized surface plasmons (LSPs) are the two fundamental plasmonic excitations. SPPs can be utilized as nanophotonic waveguides and LSPs as nano-optical sensors. The objective of our project is to understand the fundamental aspects of SPPs and LSPs and further harness them in nanophotonics circuitry and optical nanoscopy. In the process of this project we will be developing advanced

optical nanoscopy tools that can be employed in nano and biosciences.

Major Scientific findings emanating from the project so far :

Our recent experiments at IISER-Pune (APL, 100, 43108 (2012)) has shown that both SPPs and LSPs can be concomitantly realized in serially-coupled plasmonic nanowires. Our recent work at IISER-Pune on: metallic nanocrescents (JOSA-B, 22, 594-599 (2012)); nano-optical antennas (Plasmonics, in press (2012)); plasmonic nano-dimers (Appl. Opt. 51, 1688-1693(2012)) and deterministic aperiodic geometries (IJN, accepted (2012), Appl. Opt. 49, 6872 (2010)) has shown that unconventional geometries can be harnessed as tunable nano-plasmonic substrates.

New findings/significant development, if any accomplished :

In order to probe individual plasmonic and photonic nanostructures, we have built optical instruments such as holographic optical trap-based Raman microscope, dark-field nano- imaging microscope and an optical nanoscope based on 4-pi configuration. To simulate the observed optical phenomenon, we have also developed computational and theoretical techniques based on finite element methods and Fourier optics.

Awards and honors:

2013 - INSA Medal for Young Scientist (Physics), Indian National Science Academy (INSA)

2011 - Associate, Indian Academy of Sciences

comPlete list of Publications as a ramanujan fellow 1. Dual-Path Remote-Excitation Surface Enhanced

Raman Microscopy with Plasmonic Nanowire Dimer Arindam Dasgupta, Danveer Singh, G. V. Pavan Kumar Applied Physics Letters, 103, 151114 (2013)

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2. Microsphere-coupled organic waveguide: preparation, remote excitation of whispering gallery modes and waveguiding property, Rohit Chikkaraddy, Arindam Dasgupta, S. Dutta Gupta, G. V. Pavan Kumar Applied Physics Letters, 103, 031112 (2013)

3. Highly tapered pentagonal bipyramidal Au microcrystals with high index faceted corrugation: Synthesis and optical properties Gangaiah Mettela, B. Radha, Danveer Singh, G. V. Pavan Kumar, G. U. Kulkarni Scientific Reports (Nature), 3, 1793, DOI: 10.1038/srep01793 (2013)

4. Evanescent field-assisted intensity modulation of surface enhanced Raman scattering from a single plasmonic nanowire Sruthi Polali, Danveer Singh, G.V. Pavan Kumar Journal of Physics D :Applied Physics, 46, 195107 (2013)

5. Single Molecule Surface Enhanced Raman Scattering Sensitivity of Ag-core Au-shell Nanoparticles: Revealed by Bi-analyte Method Partha Pratim Patra, G.V. Pavan Kumar J. Phys.Chem. Lett., 4, 1167-1171 (2013)

6. Palladium adjoined gold split-ring resonators: a prospective nanoplasmonic hydrogen sensor G.V. Pavan Kumar, Mohit Raghuwanshi Optics Communications, 300, 65-68 (2013)

7. Plasmonic Nanowires arranged in Fibonacci number chain: Excitation angle-dependent optical properties Mohit Raghuwanshi, G.V. Pavan Kumar AIP Advances, 3, 022112 (2013)

8. Analysis of Protein Acetyltransferase Structure-Function Relation by Surface-Enhanced Raman Scattering (SERS): A Tool to Screen and Characterize Small Molecule Modulators M. Arif, D. Kathigeyan, S.Siddhanta, G.V. Pavan Kumar, C. Narayana, T.K. Kundu Methods in Molecular Biology, 981, 239-261, (2013)

9. Propagation of Light in Serially Coupled Plasmonic Nanowire Dimer: Geometry Dependence and Polarization Control Danveer Singh, Mohit Raghuwanshi, G.V. Pavan Kumar Applied Physics Letters, 101, 111111 (2012)

10. Plasmonic nano-architectures for surface enhanced Raman scattering: A review G.V. Pavan Kumar Journal of Nanophotonics, (invited review article), 6, 064503 (2012)

11. Plasmon-assisted Light propagation and Raman Scattering Hot-spot in end-to-end coupled Silver nanowire pairs Rohit Chikkaraddy, Danveer Singh, G.V. Pavan Kumar Applied Physics Letters, 100, 43108 (2012)

12. Mapping of Electro-catalytic Sites on Single Strand of Carbon Fiber Using Scanning Electrochemical Microscopy (SECM) V. Joshi, S. Haram, A. Dasgupta, G.V. Pavan Kumar Journal of Physical Chemistry C, 116, 9703-9708 (2012)

13. Near-field optical resonance and enhancement of a plasmonic nanocrescent cylinder tuned by a proximal plasmonic nanostructure G.V. Pavan Kumar Journal of Optical Society of America B, 22, 594-599 (2012)

14. Raman spectra of vibrational and librational modes in methane clathrate hydrates using Density Functional Theory R. Raghupathy, G.V. Pavan Kumar, A.Venkatnathan Journal of Chemical Physics, 136, 174305 (2012)

15. Plasmonic properties of dielectric-core plasmonic-shell nanocylinders in Pascal triangle G.V. Pavan Kumar International Journal of Nanoscience, 2 ,1250017 (2012)

16. Near-field optical analysis of plasmonic nano-probes for top-illumination tip enhanced Raman scattering Neha Mishra, G.V. Pavan Kumar Plasmonics, 7, 359-367 (2012)

20. Palladium bridged gold nanocylinder dimer: Plasmonic properties and hydrogen sensitivity Arindam Dasgupta, G.V. Pavan Kumar Applied Optics, 51, 1688-1693(2012) (Chosen for Virtual Journal for Biomedical Optics Vol. 7, Iss. 6 )

21. Raman and surface enhanced Raman spectroscopic studies of specific small molecule activator of histone acetyltransferase p300 P.P. Kundu, G.V. Pavan Kumar, K. Mantelingu, T.K. Kundu, C. Narayana Journal of Molecular Structure, 999, 10-15 (2011)

22. Gold nanoparticle-coated biomaterial as SERS micro-probes; G.V.Pavan Kumar; Bull. Mat. Sci. (rapid comm.) 34, 3, 417-422 (2011)

23. Metal-coated magnetic nanoparticles for surface enhanced Raman scattering studies G.V.Pavan Kumar, N. Rangarajan, B. Sonia, P.Deepika, N. Rohman, C. Narayana Bull. Mater. Sci., 120, 1-9 (2011)

24. Near field optical properties of silver nanocylinders arranged in Pascals triangle ; G.V.Pavan Kumar; Applied Optics 49, 6872-6877 (2010)

Book chapter :

Raman Scattering

G.V.Pavan Kumar

A textbook of Nanoscience and Nanotechnology MacGraw Hill, (2012)