Active optomechanics

Abstract

Cavity optomechanics explores the coupling between optical and mechanical modes mediated by the radiation pressure force. Unlike the passive scheme, the active optomechanics with optical gain directly imposes the mechanical motion upon the lasing dynamics, unveiling the intrinsic properties determined by the system itself. Here we numerically explore the general characteristics of the active optomechanics. The effects of the mechanical oscillation on the macroscopic laser include introducing multiple unstable regimes in the lasing phase, shifting the laser central frequency, broadening the laser spectrum, and degrading the laser frequency stability. Reducing the optical gain down to one active atom highlights the quantum nature of atom–cavity and photon–phonon interactions. The one-atom optomechanical microlaser does not only emit nonclassical photons but also generate nonclassical photon–phonon pairs. Our work extends the cavity optomechanics to the active fashion, paving the way towards optomechanical light sources for photonic integrated circuits, on-chip quantum communication, and biosensing.

Ag/Au alloy entangled in a protein matrix: A plasmonic substrate coupling surface plasmons and molecular chirality

“…fluorescent molecules, quantum dots, and photoswitchable molecules, enable a strong coupling by the concentration of the electromagnetic field to deep subwavelength achieved by exciting the surface plasmons that then results in small-volume modes and compensates the metallic loss contribution. To transfer mechanical oscillation onto lasing dynamics generated by an interaction between the gain particle-photon and photon-phonon, simplified architectures have been redesigned with a spring-mass oscillator mounted onto one end mirror of the cavity [21,22] . Shift, spectrum broadening, temporal coherence, and photon statistics depend on the optomechanical system in these systems [23] .…”

“…Initially, an analysis aimed at examining the Fabry-Pérot hybrid/surface plasmon polariton SPP hybridization in the near-field region was developed; then, the dye (rhodamine G6 [21] ) adsorbed on the Ag modifies the optomechanical spectrum and leads to a coupling rate greater than the optical decay (κ * < 𝜔 𝑐 ) [24] . The hallmark of the emitter's contribution to enhancing the sensitivity was characterized; hence, mass sensitivity was monitored by the frequency shift as various masses of deionized water were tested.…”

Prospects for an Active Optical Clock Based on Cavityless Lasing

“…We investigate the active clock system using the Heisenberg-Langevin method, [32,33] where the fluctuations of spontaneous emission of atoms are modeled as a group of Langevin forces associated with atomic variables (see Appendix A). The numerical simulation allows for the derivation of laser power, linewidth, and frequency stability.…”