Robust Polariton Bose–Einstein Condensation Laser via a Strong Coupling Microcavity

Abstract

Robust polariton in the strong‐coupling regime plays a central role in understanding Bose–Einstein condensation (BEC), which is also an ideal platform for the simulation of bosonization processes and novel engineering polariton devices that are related to quantum phase transitions. A two‐dimensional ZnO nanoplate is firstly utilized to construct microcavity polaritons, and a robust polariton BEC laser is successfully realized at room temperature (RT). High stability of the exciton state and the enhanced coupling strength in the nanoplate cavity are effective for polaritons. The giant Rabi splitting of 120 meV is extracted from the RT dispersion pattern. The evolution of polariton BEC exhibits a typical blue‐shift, and its saturation behavior shows that the interaction strength of the polaritons is deduced from the energy renormalization. Remarkably, the value of the interaction strength is two orders of magnitude higher than reported values, which implies that many‐body correlation may be dominant in the polariton strongly interacting polariton systems. The results open up the prospect of realizing robust polariton BEC lasers at high temperature.

Spin-Polarization-Induced Chiral Polariton Lasing at Room Temperature

“…Furthermore, the energy of the LP + ground state blue-shifts with increasing excitation power (Figure 2e). Such an energy shift that originates from the repulsive polariton−polariton interaction 25,34 is a clear evidence of the strong-coupling regime, and an interaction coefficient g of 0.74 meV μm 2 can be extracted from the plot (polariton density at threshold is estimated to be n 0 ∼ 1 × 10 8 cm −2 ). The interference fringes of the polariton condensate at threshold are recorded by the Michaelson interferometry and presented in the inset of Figure 2e.…”

“…Recent findings strongly suggest that the wide-band gap semiconductor microcavity is a feasible system for breaking through the temperature bottleneck of polaritonic devices. , Due to its intrinsically large exciton binding energy and giant oscillator strength, polariton BEC can be preserved at considerably higher temperatures. In fact, room temperature (RT) polariton lasing has already been realized in a wide band gap ZnO nanoplate, as reported in our previous work . Based on such semiconductor nanoplates, the spin manipulation of polariton as well as the chiral polariton lasing at RT can be anticipated.…”

“…In fact, room temperature (RT) polariton lasing has already been realized in a wide band gap ZnO nanoplate, as reported in our previous work. 25 Based on such semiconductor nanoplates, the spin manipulation of polariton as well as the chiral polariton lasing at RT can be anticipated.…”

Self-Focusing and Single-Mode Lasers from Novel Cavity Architecture for on-Fiber Integration

“…2,7 The development of high-quality (Q) single-mode microlasers is essential for building the integrated photonics and optoelectronics. 8,9 By virtue of the atomically smooth surfaces and naturally formed cavities, SCs exhibit a favorable capability of optical waveguiding and optical confinement, which renders them competitive candidates for developing high-performance single-mode lasers. However, most of the SCs exhibit an intrinsic polyhedral morphology and flat surfaces grown from the conventional self-confinement mode.…”

The Intermode Polariton Parametric Scattering Laser in a Strong Coupled Microcavity Via Two-Photon Absorption

“…The planar microcavity studied in the experiment consists of symmetric top and bottom distributed Bragg reflectors (DBRs), with a zinc oxide nanoplate embedded in the middle serving as the exciton active medium (Figure a). Zinc oxide (ZnO), as a wide-bandgap II–VI semiconductor, possesses high binding energy and a large exciton oscillator strength, making it a popular material for studying polaritons at room temperature (RT). − The two-dimensional nanoplate fabricated using chemical vapor deposition (CVD) exhibits high crystalline quality. The as-grown nanoplate features a smooth surface with a root-mean-square roughness (R rms ) of only 1.15 nm, as shown in the atomic force microscope (AFM) image (Figure b).…”