When excitons and plasmons meet: Emerging function through synthesis and assembly
- PDF / 932,230 Bytes
- 9 Pages / 585 x 783 pts Page_size
- 34 Downloads / 167 Views
ects on exciton recombination: Enhancing the radiative rate Modification of the spontaneous emission rate of a single quantum emitter is often credited to Purcell, who in 1946 stated that a resonant electrical circuit could enhance the spontaneous decay of magnetic dipole moments by a factor of 3Qλ3/4π2V, where Q denotes the quality factor of the circuit, V represents the mode volume, and λ is the wavelength of the emitted radiation. In the past three decades, various microcavities have been realized in the optical domain with the aim of maximizing the Q/V ratio and thus, the Purcell effect on optical transitions,1 whereby enhancements of a few tens in the Purcell factor have been demonstrated.2,3 In addition to modifying the natural photophysics of an emitter, a large Purcell factor also makes it possible to extract more photons from a quantum emitter per unit time. Although great progress has been made with microcavities, some limitations remain that cannot be easily overcome.
One important restriction is that, despite their seemingly small character, microcavities are relatively large. From a fundamental aspect, a microcavity cannot become arbitrarily small, beyond λ/2, where the first resonance takes place. From a practical point of view, the device is even larger because of the finite size of the mirrors and boundaries required for high reflectivity and low diffraction losses. Another difficulty of working with high-Q microcavities is the extreme spectral selectivity, which makes them sensitive to vibrations and temperature drift. Furthermore, it is usually a fabrication challenge to meet the resonance of a particular single emitter.4 An attractive alternative approach for enhancing the radiative decay of quantum emitters is to use plasmonic nanoantennas.5 Here, a metallic nanostructure, usually made of gold or silver, increases the local density of states in its near field. In an equivalent picture, the plasmon oscillation inside the metallic particle couples to the dipolar transition of the emitter in a near-field interaction, whereby the coupled system
Jennifer A. Hollingsworth, Materials Physics and Applications Division, Center for Integrated Nanotechnologies, Los Alamos National Laboratory, USA; [email protected] Han Htoon, Materials Physics and Applications Division, Center for Integrated Nanotechnologies, Los Alamos National Laboratory, USA; [email protected] Andrei Piryatinski, Theoretical Division, Physics of Condensed Matter and Complex Systems, Los Alamos National Laboratory, USA; [email protected] Stephan Götzinger, Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, and Max Planck Institute for the Science of Light, Germany; [email protected] Vahid Sandoghdar, Max Planck Institute for the Science of Light, and Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany; [email protected] DOI: 10.1557/mrs.2015.200
768
MRS BULLETIN • VOLUME 40 • SEPTEMBER 2015 • www.mrs.org/bulletin
© 2015 Materials Research Society
WHEN EXCITONS AND PLASMONS MEET: EMERGING FUNCTION
Data Loading...
