Wang Runchen, Wang Yaqi, Dong Junxing, Wang Lisheng, Wang Jingzhuo, Zhang Yifan, Chen Huanjun, Zhang Yunwei, Zhang Yiyun, Wang Yue, Zhu Hai
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China.
State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510275, China.
Nano Lett. 2024 Jul 24;24(29):8988-8995. doi: 10.1021/acs.nanolett.4c01947. Epub 2024 Jul 10.
Exciton-polaritons, hybrid quasiparticles from the strong coupling of excitons and cavity photons in semiconductor microcavities, offer a platform for exploring quantum coherence and nonlinear optical properties. The unique polariton parametric scattering (PPS) laser is of interest for its potential in quantum technologies and nonlinear devices. However, direct resonant excitation of polaritons in strong-coupling microcavities is challenging. This study proposes an innovative two-photon absorption (TPA) pump mechanism to address this. We observe TPA-driven PPS lasing in a strongly coupled microcavity at room temperature. High K-value exciton injections promote coherent stimulated emission of polariton scattering through intermode channels. Angle-resolved spectra confirm a TPA process, showing evolution from pump-state to signal-state. Hanbury Brown-Twiss measurement of second-order correlation g(τ) of signal state indicates a phase transition from a classical thermal state to a quantum coherent state. Theoretical modeling provides insights into the physical mechanisms of PPS. Our work advances nonlinear phenomena exploration in strongly coupled light-matter systems, contributing to quantum polaritonics and nonlinear optics.
激子极化激元是半导体微腔中激子与腔光子强耦合产生的混合准粒子，为探索量子相干和非线性光学性质提供了一个平台。独特的极化激元参量散射（PPS）激光器因其在量子技术和非线性器件中的潜力而备受关注。然而，在强耦合微腔中直接共振激发极化激元具有挑战性。本研究提出了一种创新的双光子吸收（TPA）泵浦机制来解决这一问题。我们在室温下的强耦合微腔中观察到了TPA驱动的PPS激光发射。高K值激子注入通过模式间通道促进了极化激元散射的相干受激发射。角分辨光谱证实了TPA过程，显示了从泵浦态到信号态的演化。对信号态二阶关联g(τ)的Hanbury Brown-Twiss测量表明从经典热态到量子相干态的相变。理论建模为PPS的物理机制提供了见解。我们的工作推动了强耦合光物质系统中非线性现象的探索，为量子极化激元学和非线性光学做出了贡献。
