Optical cryostat with magnet and spectrometer to examine tunneling magnetoplasmonics and atomic-scal
Abstract
Plasmons are the oscillating collective excitations of the electrons in metals, and nanoscale metalstructures can play host to local,ized plasmon modes that have strong effects on optical andelectronic processes. Atomic-scale planar tunnel junctions between extende,d metal electrodescan be excited both optically and by electrical current and have been particularly effective astools to examine pl,asmon processes, including light emission. The PI is conducting research(ONR award N00014-21-1-2062) that exploits the unique proper,ties of these junctions toexamine the physics of plasmonic creation of ?hot? charge carriers and plasmon-enhanced lightemission, inc,luding coupling to individual quantum emitters. A system combining a QuantumDesign OptiCool cryostat with 7 Tesla superconducting ma,gnet plus an optical spectrometer(Horiba iHR320 with Syncerity CCD head) will allow pathbreaking studies of?magnetoplasmonics?, the,interplay between plasmons and magnetic fields. Magnetic fieldsexert transverse forces on the oscillating charges in plasmons and co,uple optically ?bright?dipolar plasmons to higher-order, ?dark? multipolar plasmon resonances in noble metalnanoparticles, leading t,o magnetic field-dependent changes in polarization of scattered light.The local plasmon modes of the junctions already involve such,coupled resonances and aresensitive to atomic-scale details, and both the generation and radiative recombination of hotcharge carrie,rs are similarly sensitive. Specific studies that will be enabled by this systeminclude: (1) Detailed examination of the magnetic fi,eld dependence of light emission and hotcarrier generation processes in atomic-scale electroluminescent tunnel junctions; (2)Investi,gation of light emission in atomic-scale sites in 2D materials created and driven by planarnanogap electrodes, where magnetic field,strongly influences exciton properties and electron-hole recombination. These studies require sample-in-vacuum, variable temperature, fromcryogenic conditions to room temperature, and most importantly the magnetic field rangeafforded by the proposed system. The sys,tem additionally can be a platform for furtherexperiments on topics of DoD interest. By providing new experiences in high-fieldoptoe,lectronic measurements, the system will enhance the research training and educationalopportunities available to the graduate student,s and postdoctoral fellow supported by the DoD.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Dec 06, 2022
- Source ID
- N000142312101
Entities
People
- Douglas Natelson
Organizations
- Office of Naval Research
- Rice University
- United States Navy