奇异点辅助的声子激光与光力诱导透明研究
文献类型：学位论文
| 作者 | 吕昊 |
| 文献子类 | 博士 |
| 导师 | 王育竹 |
| 关键词 | 光力学 optomechanics 奇异点 exceptional points 声子激光 phonon laser 光力诱导透明 optomechanically induced transparency 单粒子传感器 single-particle sensor |
| 其他题名 | Research on phonon laser and optomechanically induced transparency with exceptional points |
| 英文摘要 | 量子光力学是基于电磁辐射与力学振动相互作用的一门学科，近年来发展迅速。量子光力学有许多应用，如高灵敏度传感器、光力诱导透明和低噪声的声子器件等。与光力学的发展平行，奇异点系统引起了越来越多的关注。在这样的系统中，两个或更多的本征态在奇异点处塌缩，这一反常现象导致了许多新奇的效应，如损耗诱导激光、隐身传感和光学手征模式切换等。本论文研究了奇异点辅助的声子激光与光力诱导透明，以及旋转腔中的光力诱导透明和旋转腔单纳米粒子传感器。主要结果简述如下。 (1) 声子激光是光学激光的声学类比，可利用固态光力器件实现。一般认为固体材料中的内在缺陷对光力学器件的应用是不利的。实验上发展了很多技术来尽量减少材料中缺陷的数量。与此相反，本论文研究了一种反常的效应，即调节缺陷的衰减率使其超过奇异点，声子的增益和受激发射声子数同时增强。这一效应可用一个等效的非厄米声子{二能级缺陷模型来描述，是纯光学系统中的损耗诱导激光的力学类比。 (2) 光力诱导透明是和原子系统中的电磁感应透明类似的一种现象。本论文从理论上研究了旋转微腔中的光力诱导透明。旋转引起的Sagnac效应引起了泵浦光和探测光的频率移动，对腔内光场和机械振动有很大影响。探测光的传输性质（包括透射率和群时延）因此改变。此外，数值计算表明通过调节转速和旋转方向可实现非互易光传输。 (3) 研究了单光力腔和双纳米粒子耦合系统中的光力诱导透明。实验上已经证实，在纯光学系统中，通过调节两个粒子之间的相对角度和粒子的有效尺寸可出现奇异点。在光力系统中，奇异点的存在对信号光的透射率和群时延影响很大，为利用纳米粒子调控光力诱导透明提供了新方法。此外，在这一系统中，通过调节纳米粒子之间的相对角度和光的失谐可实现快慢光之间的切换。 (4) 提出了利用旋转腔增强单纳米粒子光学传感器的灵敏度。旋转引起的探测场频移可显著增强纳米粒子导致的光学模式分裂，使得光的透射率也被明显改变。这一方案为提高基于微腔的单粒子传感器的灵敏度提供了一个可行的方法，也为利用单个旋转非线性腔或耦合腔阵列探索量子效应提供了新思路。; Quantum optomechanics based on the interaction of electromagnetic radiation and mechanical motion have progressed rapidly in the last decades, leading to a variety of applications such as highly sensitive sensors, optomechanically induced transparency (OMIT), and low-noise phonon devices. In parallel with these, exceptional-point (EP) systems have attracted increasing attentions. In such systems, two or more eigenmodes coalesce at the EPs, leading to a large number of unconventional effects, e.g., loss-induced lasing, invisible sensing, and optical chiral mode switch. In this thesis, phonon laser and OMIT with exceptional points are studied in details, as well as OMIT in a spinning resonator and the single nanoparticle sensor in a spinning resonator. The main results are reviewed briefly as follows. (1) Phonon laser is an acoustic analog of the optical laser, which can be realized in solid-state optomechanical devices. Intrinsic defects exist in solid materials, which are generally viewed to be detrimental for the applications of optomechanical devices. Many technologies have been developed to minimize the number of defects in materials. On the contrary, a counterintuitive effect is shown here, i.e., by tuning the damping rate of the defect to surpass the exceptional point, both the mechanical gain and the stimulated emitted phonon number can be enhanced despite increasing defect losses. This effect can be described by an effective non-Hermitian phonon-defect model, which is a mechanical analog of the loss-induced lasing in the purely optical system. (2) OMIT is a phenomenon similar to electromagnetically induced transparency in atomic systems. Here, OMIT is studied in a spinning microresonator. The rotation-induced Sagnac effect induces frequency shifts for both the pump and probe light, which strongly affect the intracavity photons and the mechanical oscillation. As a result, the properties of probe light, including the transmission rate and group delay, are significantly modified. In addition, numerical simulations show that by tuning the rotary direction and speed, nonreciprocal light propagation can be realized. (3) OMIT in an optomechanical resonator coupled with two nanoparticles has been studied. In a purely optical system, EPs emerge periodically by tuning the relative angle between the two nanoparticles and the effective sizes of the particles, which has been demonstrated experimentally. In an optomechanical system, the transmission rate and the group delay of the signal light are strongly affected by the EPs, which indicates a new way to steer the OMIT assisted by nanoparticles. Furthermore, by tuning the relative angle of the nanoparticles and the optical detuning, controllable slow-to-fast light switch can be achieved in such a system. (4) A scheme to enhance optical sensing of a single nanoparticle by utilizing a spinning resonator has been proposed. In presence of the rotation-induced frequency shift of the probe field, the mode splitting induced by the particle can be obviously enhanced, resulting in a strongly modified transmission spectrum. This provides a practical way to further enhance the sensitivity of a resonator-based single-particle sensor, shedding also new light on controlling quantum devices with a spinning nonlinear resonator or an array of resonators. |
| 学科主题 | 光学 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/31117]  |
| 专题 | 中国科学院上海光学精密机械研究所 |
| 作者单位 | 中国科学院上海光学精密机械研究所 |
| 推荐引用方式 GB/T 7714 | 吕昊. 奇异点辅助的声子激光与光力诱导透明研究[D]. |
入库方式： OAI收割
来源：上海光学精密机械研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。