Nano‐Cavity QED with Tunable Nano‐Tip Interaction

Abstract

Quantum state control of two‐level emitters is fundamental for many information processing, metrology, and sensing applications. However, quantum‐coherent photonic control of solid‐state emitters has traditionally been limited to cryogenic environments, which are not compatible with implementation in scalable, broadly distributed technologies. In contrast, plasmonic nano‐cavities with deep sub‐wavelength mode volumes have recently emerged as a path toward room temperature quantum control. However, optimization, control, and modeling of the cavity mode volume are still in their infancy. Here recent demonstrations of plasmonic tip‐enhanced strong coupling (TESC) with a configurable nano‐tip cavity are extended to perform a systematic experimental investigation of the cavity‐emitter interaction strength and its dependence on tip position, augmented by modeling based on both classical electrodynamics and a quasinormal mode framework. Based on this work, a perspective for nano‐cavity optics is provided as a promising tool for room temperature control of quantum coherent interactions that could spark new innovations in fields from quantum information and quantum sensing to quantum chemistry and molecular opto‐mechanics.

Photonic Quantum Technologies

“…-New experiments using tip-enhanced strong coupling to optimize the coupling strength between a plasmonic cavity and a single quantum emitter is described. [18] This work demonstrates a new methodology for optimization of plasmonic cavities. -Förster resonance energy transfer (FRET) between two solidstate quantum emitter systems is demonstrated.…”

Polariton panorama

“…An interesting recent example of plexciton study has been conducted in the setting of scanning probe nano-optical imaging and spectroscopy (Figure 8). This work by May et al [398], along with a study by Groß et al [397], implemented the scanning optical cavities formed between a nano-optical antenna and the substrate. The authors investigated CdSe/ZnS quantum dots using this scanning cavity approach and observed plexitonic Rabi splitting of 163 meV.…”

“…Panels B: Measured PL spectra for the QD, cavity plasmon polariton, weakly coupled system (WC) and strongly coupled states (SC) with coupling strength g = 141 meV. A Lorentzian lineshape representing the redshifted plasmon resonance in the presence of the QD is calculated from the fitted values (SPP QD )[398].…”

Semi-empirical Quantum Optics for Mid-Infrared Molecular Nanophotonics

“…In addition to modifying the phase of the near-field by varying the lateral position x relative to the resonator surface, nanotips can also contribute to the crossover from weak to strong coupling, as the vertical position z is tuned. Local modulation of strong coupling has been demonstrated with quantum dot emitters in optical nanoresonators [67,68], but has yet to be implemented with infrared nanostructures. In order to theoretically study these effects, we now generalize the analysis in Sec.…”