***************************************
KOÇ UNIVERSITY PHYSICS SEMINAR
***************************************
Speaker : Serkan Ateş, İYTE (IZTECH)
Title : Optical Properties of Single Defects in Hexagonal Boron Nitride
Date : October 23, 2018
Time : 14:30
Cookie & Tea : SCI 103 14:15
Place : SCI 103
web : https://physics-seminars.ku.
Abstract:
Photonics technology has reached a stage in which complex functional devices for the generation and detection of light signals can be routinely produced. Especially, the search for novel computation and communication schemes has created applications in which the manipulation and detection of extremely weak optical signals at single-photon level are crucial. Among several systems, quantum emitters in atomically thin 2D based materials, i.e., transition metal di-chalcogenides and defects in hexagonal boron nitride (hBN), have recently attracted a great interest as potentially bright and stable solid-state single-photon sources.
In this talk, I will present our recent activities on optical properties of single quantum emitters in hBN. Because of its large bandgap (~ 6 eV), hBN is known to be a good insulator, which also becomes an ideal candidate for exploring optically active defects with energies from UV to NIR. Isolated defect centers in hBN are especially important to develop on-chip room temperature efficient single photon sources. To gain insight about the optical properties, we study the temperature dependent optical properties of a single defect and observe that the emission spectra show characteristic features governed by the phonon density of states of the host hBN, which has contributions from both acoustic and optical phonons. In addition, I will present our recent results on interaction of single quantum emitters in hBN with two dimensional graphene and show a reversible and efficient energy transfer between the two material systems at a single-photon level. Finally, I will give a short overview of our research plans on integrating the quantum emitters in 2D materials with nanophotonic and plasmonic structures.
Short Bio: Dr. Serkan Ateş received his BSc degree in Physics from İYTE in 2003 and his M.Sc. and Ph.D. degrees from the University of Stuttgart in 2006 and 2011, respectively. After completing his PhD, he worked as a researcher at the Technical University of Denmark, National Institute of Standards and Technology (NIST, USA), and TUBITAK- National Electronics and Cryptology Research Institute. Since 2015, he carries out research in the fields of nanophotonics and quantum optics as a faculty member in the department of Physics at İYTE.