1. Physics of light-to-electric-signal conversion in carbon nanotubes PIs: Slava V. Rotkin *, Ivan Biaggio *, Alma E. Wickenden # Alma E. Wickenden # Other team members: Stacy E. Snyder * (graduate), Happiness Munedzimwe * (undergraduate), Philip LaPorta * (graduate), Tetyana Ignatova * (graduate), Lolita Rotkina * (research scientist), Vadim Puller + (postdoc), Igor Kolobov + (postdoc) Nanophotonics DOD-ARL:COT Seed project # Army Research Lab * Lehigh University, + at new job place General Information Slide

2. Non-linear Optics lab (Prof. I. Biaggio) Non-linear Optics lab (Prof. I. Biaggio) Overview of available methods Low-noise low-current (pA) photoelectric measurements and Low-noise low-current (pA) photoelectric measurements and Theoretical Quantum Physics lab Theoretical Quantum Physics lab (Prof. S.V. Rotkin) 3.5 2.5 1.5 0.8 1.8 2.8 3.5 2.5 1.5 0.8 1.8 2.8

3. Nonlinear Optical spectroscopy Degenerate four-wave mixing Three pulses interact to generate a fourth one: Nanotube solutions: Spectroscopy of two-photon absorption Determination of excited state lifetimes Contacted nanotube samples: Additional information on photocarrier generation from direct electrical measurements in pulsed photocurrent spectroscopy Allowed and forbidden transitions in NTs semiconductormetal

4. Photoresponse of Polymer-NT FET 20406080100120140 1 1.005 1.01 1.015 1.02 1.025 1.03 t, sec I d /V d / (I d max /V d max ) sample 3 sample 6 I d /V d curves show that charging of the trap states is equivalent to additional gating of the channel of the NT Field-Effect Transistor (controlled by light absorption) Kinetics of ion diffusion in the ionomeric polymer is likely to determine the trap discharge Ionomer-NT interface (SEM image) 500 nm 200 nm Happiness Munedzimwe, Lehigh Undergraduate

5. DNA-NT wraps: New Optic Material Physics graduate student Stacy Snyder Theory predicts: olarization-resolved spectroscopy can detect a helical warp of DNA-NT. - Polarization-resolved spectroscopy can detect a helical warp of DNA-NT. - Qualitative changes in the absorption due to the symmetry breaking plus circular dichroism, absent for the pristine nanotubes. Unperturbed SWNT ssDNA-Wrapped SWNT: right CP ssDNA-Wrapped SWNT: left CP [7,0] SWNT- ssDNA wrap E g = E 11 =1.43 eV E g pert = 1.33 eV 3.5 2.5 1.5 0.8 1.8 2.8 3.5 2.5 1.5 0.8 1.8 2.8 Luminescence, eV Absorption, eV