Coherent confinement of plasmonic field in quantum dot–metallic nanoparticle molecules

Abstract

Interaction of a hybrid system consisting of a semiconductor quantum dot and a metallic nanoparticle (MNP) with a laser beam can replace the intrinsic plasmonic field of the MNP with a coherently normalized field (coherent-plasmonic or CP field). In this paper we show how quantum coherence effects in such a hybrid system can form a coherent barrier (quantum cage) that spatially confines the CP field. This allows us to coherently control the modal volume of this field, making it significantly smaller or larger than that of the intrinsic plasmonic field of the MNP. We investigate the spatial profiles of the CP field and discuss how the field barrier depends on the collective states of the hybrid system.

Strongly modified four-wave mixing in a coupled semiconductor quantum dot-metal nanoparticle system

“…The B(right) state where after an initial delay the effective electric field of the quantum dot can be quite significant resulting in an emitting quantum dot and the D(ark) state where the field experienced by the quantum dot is screened significantly at all times. 32,33 Actually, the same author defines the normalized Rabi frequency, which coincides with our effective Rabi frequency defined in Eq. (27).…”

“…We believe that it is possible someone to derive explanations for our findings in terms of the molecular-like resonances of Sadeghi, 6,12,32,33 where the two characteristic metastates (B and D) have a strong distance (R-) and intensity (I-) dependence. 33 This is expected as these two pictures (i.e., ours in terms of the S-parameter and Sadeghi's in terms of B-and D-states) are based practically on the same physical quantity, the effective Rabi frequency defined in Eq.…”

“…This is an indication of plasmonic metaresonances in the system, a concept proposed and explored by Sadeghi. 6,12,32,33 These metaresonances are molecular-like resonances resulting by the conjugation of the quantum dot excitonic and the metal nanoparticle plasmonic excitations. It has been revealed by Sadeghi that these metaresonances can be associated with two distinct metastates of the quantum dot-metal nanoparticle system.…”

“…33 This is expected as these two pictures (i.e., ours in terms of the S-parameter and Sadeghi's in terms of B-and D-states) are based practically on the same physical quantity, the effective Rabi frequency defined in Eq. (27).…”

Efficient Biexciton Preparation in a Quantum Dot—Metal Nanoparticle System Using On-Off Pulses

“…The SQD and MNP dielectric constants are denoted by , respectively. Furthermore, the applied field stimulates surface plasmons on the MNP which come up with a powerful continuous spectral response, interact with SQD excitons [ 3 , 17 , 18 , 56 ] and thus couple the two nanoparticles, leading to Förster energy transferral [ 57 ].…”