Coherent control of Fano resonances in a macroscopic four-mirror cavity

Abstract

We demonstrate coherent control of optomechanically induced transparency and Fano resonances in a four mirror macroscopic optomechanical cavity, with two movable mirrors, each driven by an external mechanical pump. The variable control of the amplitude and phase of the coherent mechanical pumps provides a means of tuning the shape and nature of the Fano profiles. Further, our scheme shows the occurrence of tunable optomechanical features, even at very low mechanical driving field amplitudes, in macroscopic optomechanical cavities.

Optomechanically induced transparency, amplification, and Fano resonance in a multimode optomechanical system with quadratic coupling

“…If the cavity-control field detuning = 2ω m , asymmetric Fano line shape can be observed [64,68]. Similar to previous works about Fano resonance in optomechanical systems [22,23,64,68,76], we also study the absorptive behavior Re(ε T ) of the output probe field. At small coupling parameter η c 1, we can obtain |t p | 1 -Re(ε T ) and arg(t p ) -Im(ε T ) [69].…”

“…In addition, more complex interference effect occurs in optomechanical systems if the mechanical oscillator can be excited directly, which results in more interesting response property [69][70][71][72][73][74][75][76]. Zhai et al proposed that mechanical driving field can serve as a switch of photon blockade and photon-induced tunneling [77].…”

Electromagnetically Induced Transparencies with Two Transverse Bose-Einstein Condensates in a Four-Mirror Cavity

“…We consider a four mirror cavity containing transversely located two BECs along x-axis and y-axis, as illustrated in Fig. 1, unlike the previous investigations where two moving-end mirrors were considered in four mirror optomechanical systems without BECs [37,38]. External pump laser, with intensity η and frequency ω E , and probe laser, with intensity η p and frequency ω p , longitudinally (x-axis) drive the cavity with detuning ∆ p = ω E − ω p .…”

“…These transparencies occur because of quantum interferences in multiple transitional pathways at intermediate states of the system. However, the recent discussions on Fano resonances -a phenomenon of quantum nonlinear interaction that consequently occurs because of the off-resonant interference [35,36] -in a four mirror optomechanical cavity, with two vibrating mirrors, have raised another aspect of engineering hybrid systems [37,38]. Although, the phenomenon of quantum nonlinear optics has been discussed in complex systems [39][40][41][42], but the demonstration to configure ultra-cold atomic states in such multidimensional hybrid system is essential, especially with respect to quantum nonlinear optics.…”

“…In this paper, we investigate EITs with two Bose-Einstein condensates (BECs) transversely coupled to a four mirror cavity, driven by a pump and a probe laser. The high-Q (quality) factor of the cavity generates strong cavity mode which couples both atomic states after getting split from the beam splitter (BS) [37][38][39][40][41][42]. The optomechanical effects of strong cavity mode, after interacting with atomic degrees of freedom, cause the excitation of momentum side-modes in BECs, acting like two atomic oscillators coupled with each other through cavity field [43].…”