MRS Meetings and Events

 

NM02.03.07 2022 MRS Spring Meeting

Tip Enhanced Photoluminescence Based on Gold Pyramid Tip—Towards Inducing and Probing Highly Polarized and Localized Excitonic Emission in Atomically Thin Semiconductors

When and Where

May 10, 2022
11:00am - 11:15am

Hawai'i Convention Center, Level 3, 303B

Presenter

Co-Author(s)

Junze Zhou1,Fabrizio Riminucci1,Edward Barnard1,Sriram Sridhar1,Archana Raja1,Shaul Aloni1,Adam Schwartzberg1,Alexander Weber-Bargioni1,Stefano Cabrini1

Lawrence Berkeley National Laboratory1

Abstract

Junze Zhou1,Fabrizio Riminucci1,Edward Barnard1,Sriram Sridhar1,Archana Raja1,Shaul Aloni1,Adam Schwartzberg1,Alexander Weber-Bargioni1,Stefano Cabrini1

Lawrence Berkeley National Laboratory1
Manipulation and Localization of excitons in 2-D semiconducting systems have far fetching impact on the ability to design novel optoelectronic devices, study fundamental phenomena such as excitons condensation, as well as to create next generation single photon emitters, key for quantum information transduction and quantum sensing [1, 2]. 2-D Transition metal dichalcogenides such as WSe<sub>2 </sub>are a fascinating material class due to their direct band gap, high emissivity and strong exciton binding energies[3]. Various approaches to engineer the localization of excitons in these materials have been pursued, via strain[4], intrinsic and extrinsic defect creation[2] and heterostructures[5]. While fascinating in their own respect, these approaches are at least in the moment difficult to scale. Using nano optical elements, such as plasmonic nano antennas, to locally enhance the radiative recombination rate by over an order of magnitude is another approach that leads itself to be more scalable that we would like to pursue here. In this presentation, we will introduce a new type nano-cavity configuration which is based on the gold coated pyramid scanning probe and gold nanogrooves on the substrate. By using this near-field probe, we have managed to mapping the highly polarized and localized excitonic emission from the WSe<sub>2</sub>, which is deposited on the top on the Gold nanogroove substrate, with an optical resolution below 50 nm. Our work helps to reveal intrinsic physic of the strong exciton-plasmon coupling and may contribute to designing many smart optoelectronic devices.<br/>[1] B. Schuler, K.A. Cochrane, C. Kastl, E.S. Barnard, E. Wong, N.J. Borys, A.M. Schwartzberg, D.F. Ogletree, F.J.G.d. Abajo, A. Weber-Bargioni, Electrically driven photon emission from individual atomic defects in monolayer WS2, Science Advances 6 (2020) eabb5988.<br/>[2] L. Peng, H. Chan, P. Choo, T.W. Odom, S.K.R.S. Sankaranarayanan, X. Ma, Creation of Single-Photon Emitters in WSe2 Monolayers Using Nanometer-Sized Gold Tips, Nano Letters 20 (2020) 5866-5872.<br/>[3] J. Huang, T.B. Hoang, M.H. Mikkelsen, Probing the origin of excitonic states in monolayer WSe2, Sci Rep 6 (2016) 22414.<br/>[4] Y. Koo, Y. Kim, S.H. Choi, H. Lee, J. Choi, D.Y. Lee, M. Kang, H.S. Lee, K.K. Kim, G. Lee, K.D. Park, Tip-Induced Nano-Engineering of Strain, Bandgap, and Exciton Funneling in 2D Semiconductors, Adv Mater 33 (2021) e2008234.<br/>[5] C. Jin, E.C. Regan, A. Yan, M. Iqbal Bakti Utama, D. Wang, S. Zhao, Y. Qin, S. Yang, Z. Zheng, S. Shi, K. Watanabe, T. Taniguchi, S. Tongay, A. Zettl, F. Wang, Observation of moiré excitons in WSe2/WS2 heterostructure superlattices, Nature 567 (2019) 76-80.

Keywords

electron-phonon interactions | scanning probe microscopy (SPM)

Symposium Organizers

Archana Raja, Lawrence Berkeley National Laboratory
Diana Qiu, Yale University
Arend van der Zande, University of Illinois at Urbana Champaign
Stephen Wu, University of Rochester

Publishing Alliance

MRS publishes with Springer Nature