Lecturer: Mr. Moshe Harats Affiliation: Racah Institute of Physics, The Hebrew University of Jerusalem Abstract: In recent years, there has been a great effort in shaping the emission pattern of colloidal Nanocrystal Quantum Dots (NQDs) to utilize them as efficient light sources down to the single photon level. The advantage of NQDs in this matter stems from their high quantum yield, the possibility to change the emission wavelength by changing their size, the Stokes shift between the excitation wavelength and the emission wavelength, and their operation as single photon emitters in room temperature. In order to exploit the promising features of NQDs, one needs to overcome the isotropic emission pattern. In this talk I will present two different designs for the collimation of emission from NQDs – a circular plasmonic lens and a hybrid structure consisted of a plasmonic lens with a dielectric layer. The different samples are measured using a spectrally resolved k-space imaging technique [1,2] and in both cases we show a record high collimation effect of 4° divergence angle. We calculate the far-field emission pattern using a semi-analytical calculation [3] and FDTD simulations with very good agreement with the experimental results. In addition, a Hanbury-Brown-Twiss measurement was performed to show that the emission is from a single NQD. A value of g⁽²⁾(0)<0.5 was achieved which indicates a single NQD emission from the hybrid nanoantenna. [1]M. G. Harats, N. Livneh, G. Zaiats, S. Yochelis, Y. Paltiel, E. Lifshitz, and R. Rapaport, Nano Lett. 14, 5766 (2014). [2]A. Tittl, M. G. Harats, R. Walter, X. Yin, M. Schäferling, N. Liu, R. Rapaport, and H. Giessen, ACS Nano 8, 10885 (2014). [3]L. Martin-Moreno, F. J. Garcia-Vidal, H. J. Lezec, A. Degiron, and T. W. Ebbesen, Phys. Rev. Lett. 90, 167401 (2003). ‏האירוע הזה כולל שיחת וידאו ב-Google Hangouts. הצטרף: https://hangouts.google.com/hangouts/_/mail.huji.ac.il/special-lecture?h...